* [RFC PATCH 0/2] Add support for sharing page tables across processes (Previously mshare)
@ 2023-01-20 16:08 ` Khalid Aziz
0 siblings, 0 replies; 8+ messages in thread
From: Khalid Aziz @ 2022-12-06 15:41 UTC (permalink / raw)
To: akpm, willy, djwong, markhemm, viro, david, mike.kravetz
Cc: Khalid Aziz, andreyknvl, dave.hansen, luto, 21cnbao, arnd,
ebiederm, elver, linux-arch, linux-kernel, linux-mm, mhiramat,
rostedt, vasily.averin, khalid.aziz
[Previously mshare patches. After discussion on mailing list and at
LSF/MM, mshare implementation has been reworked to eliminate the
mshare API and use mmap instead with a new flag. This eliminates the
need for msharefs. Alignment and size restrictions were changed to
PMD]
Memory pages shared between processes require a page table entry
(PTE) for each process. Each of these PTE consumes consume some of
the memory and as long as number of mappings being maintained is
small enough, this space consumed by page tables is not
objectionable. When very few memory pages are shared between
processes, the number of page table entries (PTEs) to maintain is
mostly constrained by the number of pages of memory on the system.
As the number of shared pages and the number of times pages are
shared goes up, amount of memory consumed by page tables starts to
become significant. This issue does not apply to threads. Any number
of threads can share the same pages inside a process while sharing
the same PTEs. Extending this same model to sharing pages across
processes can eliminate this issue for sharing across processes as
well.
Some of the field deployments commonly see memory pages shared
across 1000s of processes. On x86_64, each page requires a PTE that
is only 8 bytes long which is very small compared to the 4K page
size. When 2000 processes map the same page in their address space,
each one of them requires 8 bytes for its PTE and together that adds
up to 8K of memory just to hold the PTEs for one 4K page. On a
database server with 300GB SGA, a system crash was seen with
out-of-memory condition when 1500+ clients tried to share this SGA
even though the system had 512GB of memory. On this server, in the
worst case scenario of all 1500 processes mapping every page from
SGA would have required 878GB+ for just the PTEs. If these PTEs
could be shared, amount of memory saved is very significant.
This patch series adds a new flag to mmap() call - MAP_SHARED_PT.
This map can be specified along with MAP_SHARED by a process to hint
to kernel that it wishes to share page table entries for this file
mapping mmap region with other processes. Any other process that
mmaps the same file with MAP_SHARED_PT flag can then share the same
page table entries. Besides specifying MAP_SHARED_PT flag, the
processes must map the files at a PMD aligned address with a size
that is a multiple of PMD size and at the same virtual addresses.
This last requirement of same virtual addresses can possibly be
relaxed if that is the consensus.
When mmap() is called with MAP_SHARED_PT flag, a new host mm struct
is created to hold the shared page tables. Host mm struct is not
attached to a process. Start and size of host mm are set to the
start and size of the mmap region and a VMA covering this range is
also added to host mm struct. Existing page table entries from the
process that creates the mapping are copied over to the host mm
struct. All processes mapping this shared region are considered
guest processes. When a guest process mmap's the shared region, a vm
flag VM_SHARED_PT is added to the VMAs in guest process. Upon a page
fault, VMA is checked for the presence of VM_SHARED_PT flag. If the
flag is found, its corresponding PMD is updated with the PMD from
host mm struct so the PMD will point to the page tables in host mm
struct. vm_mm pointer of the VMA is also updated to point to host mm
struct for the duration of fault handling to ensure fault handling
happens in the context of host mm struct. When a new PTE is
created, it is created in the host mm struct page tables and the PMD
in guest mm points to the same PTEs.
This is a basic working implementation. It will need to go through
more testing and refinements. Some notes and questions:
- PMD size alignment and size requirement is currently hard coded
in. Is there a need or desire to make this more flexible and work
with other alignments/sizes? PMD size allows for adapting this
infrastructure to form the basis for hugetlbfs page table sharing
as well. More work ill be needed to make that happen.
- Is there a reason to allow a userspace app to query this size and
alignment requirement for MAP_SHARED_PT in some way?
- Shared PTEs means mprotect() call made by one process affects all
processes sharing the same mapping and that behavior will need to
be documented clearly. Effect of mprotect call being different for
processes using shared page tables is the primary reason to
require an explicit opt-in from userspace processes to share page
tables. With a transparent sharing derived from MAP_SHARED alone,
changed effect of mprotect can break significant number of
userspace apps. One could work around that by unsharing whenever
mprotect changes modes on shared mapping but that introduces
complexity and the capability to execute a single mprotect to
change modes across 1000's of processes sharing a mapped database
is a feature explicitly asked for by database folks. This
capability has significant performance advantage when compared to
mechanism of sending messages to every process using shared
mapping to call mprotect and change modes in each process, or
using traps on permissions mismatch in each process.
- This implementation does not allow unmapping page table shared
mappings partially. Should that be supported in future?
- Patch 2 will be broken up into smaller patches after RFC. It
likely is easier to review the proposal with all code in one patch
for now.
Khalid Aziz (2):
mm/ptshare: Add vm flag for shared PTE
mm/ptshare: Create a new mm to share pagetables
include/linux/fs.h | 1 +
include/linux/mm.h | 8 +
include/trace/events/mmflags.h | 3 +-
include/uapi/asm-generic/mman-common.h | 1 +
mm/Makefile | 2 +-
mm/internal.h | 21 ++
mm/memory.c | 52 ++++-
mm/mmap.c | 87 ++++++++
mm/ptshare.c | 262 +++++++++++++++++++++++++
9 files changed, 433 insertions(+), 4 deletions(-)
create mode 100644 mm/ptshare.c
--
2.34.1
^ permalink raw reply [flat|nested] 8+ messages in thread
* [RFC PATCH 1/2] mm/ptshare: Add vm flag for shared PTE
@ 2023-01-20 16:08 ` Khalid Aziz
0 siblings, 0 replies; 8+ messages in thread
From: Khalid Aziz @ 2022-12-06 15:41 UTC (permalink / raw)
To: akpm, willy, djwong, markhemm, viro, david, mike.kravetz
Cc: Khalid Aziz, andreyknvl, dave.hansen, luto, 21cnbao, arnd,
ebiederm, elver, linux-arch, linux-kernel, linux-mm, mhiramat,
rostedt, vasily.averin, Khalid Aziz
Add a bit to vm_flags to indicate a vma shares PTEs with others. Add
a function to determine if a vma shares PTE by checking this flag.
This is to be used to find the shared page table entries on page fault
for vmas sharing PTE.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/mm.h | 8 ++++++++
include/trace/events/mmflags.h | 3 ++-
mm/internal.h | 5 +++++
3 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8bbcccbc5565..699323be7502 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -314,11 +314,13 @@ extern unsigned int kobjsize(const void *objp);
#define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
#define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
#define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */
+#define VM_HIGH_ARCH_BIT_5 37 /* bit only usable on 64-bit architectures */
#define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
#define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
#define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
#define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
#define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4)
+#define VM_HIGH_ARCH_5 BIT(VM_HIGH_ARCH_BIT_5)
#endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
#ifdef CONFIG_ARCH_HAS_PKEYS
@@ -360,6 +362,12 @@ extern unsigned int kobjsize(const void *objp);
# define VM_MTE_ALLOWED VM_NONE
#endif
+#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
+#define VM_SHARED_PT VM_HIGH_ARCH_5
+#else
+#define VM_SHARED_PT VM_NONE
+#endif
+
#ifndef VM_GROWSUP
# define VM_GROWSUP VM_NONE
#endif
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index e87cb2b80ed3..30e56cbac99b 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -194,7 +194,8 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \
{VM_MIXEDMAP, "mixedmap" }, \
{VM_HUGEPAGE, "hugepage" }, \
{VM_NOHUGEPAGE, "nohugepage" }, \
- {VM_MERGEABLE, "mergeable" } \
+ {VM_MERGEABLE, "mergeable" }, \
+ {VM_SHARED_PT, "sharedpt" } \
#define show_vma_flags(flags) \
(flags) ? __print_flags(flags, "|", \
diff --git a/mm/internal.h b/mm/internal.h
index 6b7ef495b56d..16083eca720e 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -856,4 +856,9 @@ static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma)
return !(vma->vm_flags & VM_SOFTDIRTY);
}
+static inline bool vma_is_shared(const struct vm_area_struct *vma)
+{
+ return vma->vm_flags & VM_SHARED_PT;
+}
+
#endif /* __MM_INTERNAL_H */
--
2.34.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [RFC PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support
@ 2023-01-20 16:08 ` Khalid Aziz
0 siblings, 0 replies; 8+ messages in thread
From: Khalid Aziz @ 2022-12-06 15:41 UTC (permalink / raw)
To: akpm, willy, djwong, markhemm, viro, david, mike.kravetz
Cc: Khalid Aziz, andreyknvl, dave.hansen, luto, 21cnbao, arnd,
ebiederm, elver, linux-arch, linux-kernel, linux-mm, mhiramat,
rostedt, vasily.averin, Khalid Aziz
When a process mmaps a file with MAP_SHARED flag, it is possible
that any other processes mmaping the same file with MAP_SHARED
flag with same permissions could share the page table entries as
well instead of creating duplicate entries. This patch introduces a
new flag MAP_SHARED_PT which a process can use to hint that it can
share page atbes with other processes using the same mapping. It
creates a new mm struct to hold the shareable page table entries for
the newly mapped region. This new mm is not associated with a task.
Its lifetime is until the last shared mapping is deleted. It adds a
new pointer "ptshare_data" to struct address_space which points to
the data structure that will contain pointer to this newly created
mm.
Add support for creating a new set of shared page tables in a new
mm_struct upon mmap of an region that can potentially share page
tables. Add page fault handling for this now shared region. Modify
free_pgtables path to make sure page tables in the shared regions
are kept intact when a process using page table region exits and
there are other mappers for the shared region. Clean up mm_struct
holding shared page tables when the last process sharing the region
exits.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/fs.h | 1 +
include/uapi/asm-generic/mman-common.h | 1 +
mm/Makefile | 2 +-
mm/internal.h | 16 ++
mm/memory.c | 52 ++++-
mm/mmap.c | 87 ++++++++
mm/ptshare.c | 262 +++++++++++++++++++++++++
7 files changed, 418 insertions(+), 3 deletions(-)
create mode 100644 mm/ptshare.c
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 59ae95ddb679..f940bf03303b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -441,6 +441,7 @@ struct address_space {
spinlock_t private_lock;
struct list_head private_list;
void *private_data;
+ void *ptshare_data;
} __attribute__((aligned(sizeof(long)))) __randomize_layout;
/*
* On most architectures that alignment is already the case; but
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 6ce1f1ceb432..4d23456b5915 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -29,6 +29,7 @@
#define MAP_HUGETLB 0x040000 /* create a huge page mapping */
#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */
#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
+#define MAP_SHARED_PT 0x200000 /* Shared page table mappings */
#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be
* uninitialized */
diff --git a/mm/Makefile b/mm/Makefile
index 8e105e5b3e29..d9bb14fdf220 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -40,7 +40,7 @@ mmu-y := nommu.o
mmu-$(CONFIG_MMU) := highmem.o memory.o mincore.o \
mlock.o mmap.o mmu_gather.o mprotect.o mremap.o \
msync.o page_vma_mapped.o pagewalk.o \
- pgtable-generic.o rmap.o vmalloc.o
+ pgtable-generic.o rmap.o vmalloc.o ptshare.o
ifdef CONFIG_CROSS_MEMORY_ATTACH
diff --git a/mm/internal.h b/mm/internal.h
index 16083eca720e..22cae2ff97fa 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -861,4 +861,20 @@ static inline bool vma_is_shared(const struct vm_area_struct *vma)
return vma->vm_flags & VM_SHARED_PT;
}
+/*
+ * mm/ptshare.c
+ */
+struct mshare_data {
+ struct mm_struct *mm;
+ refcount_t refcnt;
+ unsigned long start;
+ unsigned long size;
+ unsigned long mode;
+};
+int ptshare_new_mm(struct file *file, struct vm_area_struct *vma);
+void ptshare_del_mm(struct vm_area_struct *vm);
+int ptshare_insert_vma(struct mm_struct *mm, struct vm_area_struct *vma);
+extern vm_fault_t find_shared_vma(struct vm_area_struct **vmap,
+ unsigned long *addrp, unsigned int flags);
+
#endif /* __MM_INTERNAL_H */
diff --git a/mm/memory.c b/mm/memory.c
index 8a6d5c823f91..051c82e13627 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -416,15 +416,21 @@ void free_pgtables(struct mmu_gather *tlb, struct maple_tree *mt,
unlink_anon_vmas(vma);
unlink_file_vma(vma);
+ /*
+ * If vma is sharing page tables through a host mm, do not
+ * free page tables for it. Those page tables wil be freed
+ * when host mm is released.
+ */
if (is_vm_hugetlb_page(vma)) {
hugetlb_free_pgd_range(tlb, addr, vma->vm_end,
floor, next ? next->vm_start : ceiling);
- } else {
+ } else if (!vma_is_shared(vma)) {
/*
* Optimization: gather nearby vmas into one call down
*/
while (next && next->vm_start <= vma->vm_end + PMD_SIZE
- && !is_vm_hugetlb_page(next)) {
+ && !is_vm_hugetlb_page(next)
+ && !vma_is_shared(next)) {
vma = next;
next = mas_find(&mas, ceiling - 1);
unlink_anon_vmas(vma);
@@ -5189,6 +5195,8 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
unsigned int flags, struct pt_regs *regs)
{
vm_fault_t ret;
+ bool shared = false;
+ struct mm_struct *orig_mm;
__set_current_state(TASK_RUNNING);
@@ -5198,6 +5206,16 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
/* do counter updates before entering really critical section. */
check_sync_rss_stat(current);
+ orig_mm = vma->vm_mm;
+ if (unlikely(vma_is_shared(vma))) {
+ ret = find_shared_vma(&vma, &address, flags);
+ if (ret)
+ return ret;
+ if (!vma)
+ return VM_FAULT_SIGSEGV;
+ shared = true;
+ }
+
if (!arch_vma_access_permitted(vma, flags & FAULT_FLAG_WRITE,
flags & FAULT_FLAG_INSTRUCTION,
flags & FAULT_FLAG_REMOTE))
@@ -5219,6 +5237,36 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
lru_gen_exit_fault();
+ /*
+ * Release the read lock on shared VMA's parent mm unless
+ * __handle_mm_fault released the lock already.
+ * __handle_mm_fault sets VM_FAULT_RETRY in return value if
+ * it released mmap lock. If lock was released, that implies
+ * the lock would have been released on task's original mm if
+ * this were not a shared PTE vma. To keep lock state consistent,
+ * make sure to release the lock on task's original mm
+ */
+ if (shared) {
+ int release_mmlock = 1;
+
+ if (!(ret & VM_FAULT_RETRY)) {
+ mmap_read_unlock(vma->vm_mm);
+ release_mmlock = 0;
+ } else if ((flags & FAULT_FLAG_ALLOW_RETRY) &&
+ (flags & FAULT_FLAG_RETRY_NOWAIT)) {
+ mmap_read_unlock(vma->vm_mm);
+ release_mmlock = 0;
+ }
+
+ /*
+ * Reset guest vma pointers that were set up in
+ * find_shared_vma() to process this fault.
+ */
+ vma->vm_mm = orig_mm;
+ if (release_mmlock)
+ mmap_read_unlock(orig_mm);
+ }
+
if (flags & FAULT_FLAG_USER) {
mem_cgroup_exit_user_fault();
/*
diff --git a/mm/mmap.c b/mm/mmap.c
index 74a84eb33b90..c1adb9d52f5d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1245,6 +1245,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
struct mm_struct *mm = current->mm;
vm_flags_t vm_flags;
int pkey = 0;
+ int ptshare = 0;
validate_mm(mm);
*populate = 0;
@@ -1282,6 +1283,21 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
if (mm->map_count > sysctl_max_map_count)
return -ENOMEM;
+ /*
+ * If MAP_SHARED_PT is set, MAP_SHARED or MAP_SHARED_VALIDATE must
+ * be set as well
+ */
+ if (flags & MAP_SHARED_PT) {
+#if VM_SHARED_PT
+ if (flags & (MAP_SHARED | MAP_SHARED_VALIDATE))
+ ptshare = 1;
+ else
+ return -EINVAL;
+#else
+ return -EINVAL;
+#endif
+ }
+
/* Obtain the address to map to. we verify (or select) it and ensure
* that it represents a valid section of the address space.
*/
@@ -1414,6 +1430,60 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
((vm_flags & VM_LOCKED) ||
(flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE))
*populate = len;
+
+#if VM_SHARED_PT
+ /*
+ * Check if this mapping is a candidate for page table sharing
+ * at PMD level. It is if following conditions hold:
+ * - It is not anonymous mapping
+ * - It is not hugetlbfs mapping (for now)
+ * - flags conatins MAP_SHARED or MAP_SHARED_VALIDATE and
+ * MAP_SHARED_PT
+ * - Start address is aligned to PMD size
+ * - Mapping size is a multiple of PMD size
+ */
+ if (ptshare && file && !is_file_hugepages(file)) {
+ struct vm_area_struct *vma;
+
+ vma = find_vma(mm, addr);
+ if (!((vma->vm_start | vma->vm_end) & (PMD_SIZE - 1))) {
+ struct mshare_data *info = file->f_mapping->ptshare_data;
+
+ /*
+ * If this mapping has not been set up for page table
+ * sharing yet, do so by creating a new mm to hold the
+ * shared page tables for this mapping
+ */
+ if (info == NULL) {
+ int ret;
+
+ ret = ptshare_new_mm(file, vma);
+ if (ret < 0)
+ return ret;
+ info = file->f_mapping->ptshare_data;
+ ret = ptshare_insert_vma(info->mm, vma);
+ if (ret < 0)
+ addr = ret;
+ else
+ vma->vm_flags |= VM_SHARED_PT;
+ } else {
+ /*
+ * Page tables will be shared only if the
+ * file is mapped in with the same permissions
+ * across all mappers with same starting
+ * address and size
+ */
+ if (((prot & info->mode) == info->mode) &&
+ (addr == info->start) &&
+ (len == info->size)) {
+ vma->vm_flags |= VM_SHARED_PT;
+ refcount_inc(&info->refcnt);
+ }
+ }
+ }
+ }
+#endif
+
return addr;
}
@@ -2491,6 +2561,21 @@ int do_mas_munmap(struct ma_state *mas, struct mm_struct *mm,
if (end == start)
return -EINVAL;
+ /*
+ * Check if this vma uses shared page tables
+ */
+ vma = find_vma_intersection(mm, start, end);
+ if (vma && unlikely(vma_is_shared(vma))) {
+ struct mshare_data *info = NULL;
+
+ if (vma->vm_file && vma->vm_file->f_mapping)
+ info = vma->vm_file->f_mapping->ptshare_data;
+ /* Don't allow partial munmaps */
+ if (info && ((start != info->start) || (len != info->size)))
+ return -EINVAL;
+ ptshare_del_mm(vma);
+ }
+
/* arch_unmap() might do unmaps itself. */
arch_unmap(mm, start, end);
@@ -2660,6 +2745,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
}
}
+ if (vm_flags & VM_SHARED_PT)
+ vma->vm_flags |= VM_SHARED_PT;
vm_flags = vma->vm_flags;
} else if (vm_flags & VM_SHARED) {
error = shmem_zero_setup(vma);
diff --git a/mm/ptshare.c b/mm/ptshare.c
new file mode 100644
index 000000000000..97322f822233
--- /dev/null
+++ b/mm/ptshare.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Share page table entries when possible to reduce the amount of extra
+ * memory consumed by page tables
+ *
+ * Copyright (C) 2022 Oracle Corp. All rights reserved.
+ * Authors: Khalid Aziz <khalid.aziz@oracle.com>
+ * Matthew Wilcox <willy@infradead.org>
+ */
+
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <asm/pgalloc.h>
+#include "internal.h"
+
+/*
+ */
+static pmd_t
+*get_pmd(struct mm_struct *mm, unsigned long addr)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset(mm, addr);
+ if (pgd_none(*pgd))
+ return NULL;
+
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d)) {
+ p4d = p4d_alloc(mm, pgd, addr);
+ if (!p4d)
+ return NULL;
+ }
+
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ pud = pud_alloc(mm, p4d, addr);
+ if (!pud)
+ return NULL;
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ pmd = pmd_alloc(mm, pud, addr);
+ if (!pmd)
+ return NULL;
+ }
+
+ return pmd;
+}
+
+/*
+ * Find the shared pmd entries in host mm struct and install them into
+ * guest page tables.
+ */
+static int
+ptshare_copy_pmd(struct mm_struct *host_mm, struct mm_struct *guest_mm,
+ struct vm_area_struct *vma, unsigned long addr)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *host_pmd;
+ spinlock_t *host_ptl, *guest_ptl;
+
+ pgd = pgd_offset(guest_mm, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d)) {
+ p4d = p4d_alloc(guest_mm, pgd, addr);
+ if (!p4d)
+ return 1;
+ }
+
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ host_pmd = get_pmd(host_mm, addr);
+ if (!host_pmd)
+ return 1;
+
+ get_page(virt_to_page(host_pmd));
+ host_ptl = pmd_lockptr(host_mm, host_pmd);
+ guest_ptl = pud_lockptr(guest_mm, pud);
+ spin_lock(host_ptl);
+ spin_lock(guest_ptl);
+ pud_populate(guest_mm, pud,
+ (pmd_t *)((unsigned long)host_pmd & PAGE_MASK));
+ put_page(virt_to_page(host_pmd));
+ spin_unlock(guest_ptl);
+ spin_unlock(host_ptl);
+ }
+
+ return 0;
+}
+
+/*
+ * Find the shared page tables in hosting mm struct and install those in
+ * the guest mm struct
+ */
+vm_fault_t
+find_shared_vma(struct vm_area_struct **vmap, unsigned long *addrp,
+ unsigned int flags)
+{
+ struct mshare_data *info;
+ struct mm_struct *host_mm;
+ struct vm_area_struct *host_vma, *guest_vma = *vmap;
+ unsigned long host_addr;
+ pmd_t *guest_pmd, *host_pmd;
+
+ if ((!guest_vma->vm_file) || (!guest_vma->vm_file->f_mapping))
+ return 0;
+ info = guest_vma->vm_file->f_mapping->ptshare_data;
+ if (!info) {
+ pr_warn("VM_SHARED_PT vma with NULL ptshare_data");
+ dump_stack_print_info(KERN_WARNING);
+ return 0;
+ }
+ host_mm = info->mm;
+
+ mmap_read_lock(host_mm);
+ host_addr = *addrp - guest_vma->vm_start + host_mm->mmap_base;
+ host_pmd = get_pmd(host_mm, host_addr);
+ guest_pmd = get_pmd(guest_vma->vm_mm, *addrp);
+ if (!pmd_same(*guest_pmd, *host_pmd)) {
+ set_pmd(guest_pmd, *host_pmd);
+ mmap_read_unlock(host_mm);
+ return VM_FAULT_NOPAGE;
+ }
+
+ *addrp = host_addr;
+ host_vma = find_vma(host_mm, host_addr);
+ if (!host_vma)
+ return VM_FAULT_SIGSEGV;
+
+ /*
+ * Point vm_mm for the faulting vma to the mm struct holding shared
+ * page tables so the fault handling will happen in the right
+ * shared context
+ */
+ guest_vma->vm_mm = host_mm;
+
+ return 0;
+}
+
+/*
+ * Create a new mm struct that will hold the shared PTEs. Pointer to
+ * this new mm is stored in the data structure mshare_data which also
+ * includes a refcount for any current references to PTEs in this new
+ * mm. This refcount is used to determine when the mm struct for shared
+ * PTEs can be deleted.
+ */
+int
+ptshare_new_mm(struct file *file, struct vm_area_struct *vma)
+{
+ struct mm_struct *new_mm;
+ struct mshare_data *info = NULL;
+ int retval = 0;
+ unsigned long start = vma->vm_start;
+ unsigned long len = vma->vm_end - vma->vm_start;
+
+ new_mm = mm_alloc();
+ if (!new_mm) {
+ retval = -ENOMEM;
+ goto err_free;
+ }
+ new_mm->mmap_base = start;
+ new_mm->task_size = len;
+ if (!new_mm->task_size)
+ new_mm->task_size--;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ retval = -ENOMEM;
+ goto err_free;
+ }
+ info->mm = new_mm;
+ info->start = start;
+ info->size = len;
+ refcount_set(&info->refcnt, 1);
+ file->f_mapping->ptshare_data = info;
+
+ return retval;
+
+err_free:
+ if (new_mm)
+ mmput(new_mm);
+ kfree(info);
+ return retval;
+}
+
+/*
+ * insert vma into mm holding shared page tables
+ */
+int
+ptshare_insert_vma(struct mm_struct *mm, struct vm_area_struct *vma)
+{
+ struct vm_area_struct *new_vma;
+ int err = 0;
+
+ new_vma = vm_area_dup(vma);
+ if (!new_vma)
+ return -ENOMEM;
+
+ new_vma->vm_file = NULL;
+ /*
+ * This new vma belongs to host mm, so clear the VM_SHARED_PT
+ * flag on this so we know this is the host vma when we clean
+ * up page tables. Do not use THP for page table shared regions
+ */
+ new_vma->vm_flags &= ~(VM_SHARED | VM_SHARED_PT);
+ new_vma->vm_flags |= VM_NOHUGEPAGE;
+ new_vma->vm_mm = mm;
+
+ err = insert_vm_struct(mm, new_vma);
+ if (err)
+ return -ENOMEM;
+
+ /*
+ * Copy the PMD entries from host mm to guest so they use the
+ * same PTEs
+ */
+ err = ptshare_copy_pmd(mm, vma->vm_mm, vma, vma->vm_start);
+
+ return err;
+}
+
+/*
+ * Free the mm struct created to hold shared PTEs and associated data
+ * structures
+ */
+static inline void
+free_ptshare_mm(struct mshare_data *info)
+{
+ mmput(info->mm);
+ kfree(info);
+}
+
+/*
+ * This function is called when a reference to the shared PTEs in mm
+ * struct is dropped. It updates refcount and checks to see if last
+ * reference to the mm struct holding shared PTEs has been dropped. If
+ * so, it cleans up the mm struct and associated data structures
+ */
+void
+ptshare_del_mm(struct vm_area_struct *vma)
+{
+ struct mshare_data *info;
+ struct file *file = vma->vm_file;
+
+ if (!file || (!file->f_mapping))
+ return;
+ info = file->f_mapping->ptshare_data;
+ WARN_ON(!info);
+ if (!info)
+ return;
+
+ if (refcount_dec_and_test(&info->refcnt)) {
+ free_ptshare_mm(info);
+ file->f_mapping->ptshare_data = NULL;
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [RFC PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support
2023-01-20 16:08 ` [RFC RESEND " Khalid Aziz
(?)
@ 2022-12-06 17:47 ` kernel test robot
-1 siblings, 0 replies; 8+ messages in thread
From: kernel test robot @ 2022-12-06 17:47 UTC (permalink / raw)
To: Khalid Aziz; +Cc: oe-kbuild-all
[-- Attachment #1: Type: text/plain, Size: 8193 bytes --]
Hi Khalid,
[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on arnd-asm-generic/master]
[also build test WARNING on soc/for-next linus/master v6.1-rc8 next-20221206]
[cannot apply to akpm-mm/mm-everything]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Khalid-Aziz/Add-support-for-sharing-page-tables-across-processes-Previously-mshare/20221206-234256
base: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
patch link: https://lore.kernel.org/r/9b2679745f94c6bac875abb61e5093d462626a1f.1670287696.git.khalid.aziz%40oracle.com
patch subject: [RFC PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support
config: i386-tinyconfig
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
# https://github.com/intel-lab-lkp/linux/commit/cb94453c0289f4fd9a5a6a488950cf699162f4dc
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Khalid-Aziz/Add-support-for-sharing-page-tables-across-processes-Previously-mshare/20221206-234256
git checkout cb94453c0289f4fd9a5a6a488950cf699162f4dc
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
mm/mmap.c: In function 'do_mmap':
>> mm/mmap.c:1248:13: warning: unused variable 'ptshare' [-Wunused-variable]
1248 | int ptshare = 0;
| ^~~~~~~
vim +/ptshare +1248 mm/mmap.c
1236
1237 /*
1238 * The caller must write-lock current->mm->mmap_lock.
1239 */
1240 unsigned long do_mmap(struct file *file, unsigned long addr,
1241 unsigned long len, unsigned long prot,
1242 unsigned long flags, unsigned long pgoff,
1243 unsigned long *populate, struct list_head *uf)
1244 {
1245 struct mm_struct *mm = current->mm;
1246 vm_flags_t vm_flags;
1247 int pkey = 0;
> 1248 int ptshare = 0;
1249
1250 validate_mm(mm);
1251 *populate = 0;
1252
1253 if (!len)
1254 return -EINVAL;
1255
1256 /*
1257 * Does the application expect PROT_READ to imply PROT_EXEC?
1258 *
1259 * (the exception is when the underlying filesystem is noexec
1260 * mounted, in which case we dont add PROT_EXEC.)
1261 */
1262 if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC))
1263 if (!(file && path_noexec(&file->f_path)))
1264 prot |= PROT_EXEC;
1265
1266 /* force arch specific MAP_FIXED handling in get_unmapped_area */
1267 if (flags & MAP_FIXED_NOREPLACE)
1268 flags |= MAP_FIXED;
1269
1270 if (!(flags & MAP_FIXED))
1271 addr = round_hint_to_min(addr);
1272
1273 /* Careful about overflows.. */
1274 len = PAGE_ALIGN(len);
1275 if (!len)
1276 return -ENOMEM;
1277
1278 /* offset overflow? */
1279 if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
1280 return -EOVERFLOW;
1281
1282 /* Too many mappings? */
1283 if (mm->map_count > sysctl_max_map_count)
1284 return -ENOMEM;
1285
1286 /*
1287 * If MAP_SHARED_PT is set, MAP_SHARED or MAP_SHARED_VALIDATE must
1288 * be set as well
1289 */
1290 if (flags & MAP_SHARED_PT) {
1291 #if VM_SHARED_PT
1292 if (flags & (MAP_SHARED | MAP_SHARED_VALIDATE))
1293 ptshare = 1;
1294 else
1295 return -EINVAL;
1296 #else
1297 return -EINVAL;
1298 #endif
1299 }
1300
1301 /* Obtain the address to map to. we verify (or select) it and ensure
1302 * that it represents a valid section of the address space.
1303 */
1304 addr = get_unmapped_area(file, addr, len, pgoff, flags);
1305 if (IS_ERR_VALUE(addr))
1306 return addr;
1307
1308 if (flags & MAP_FIXED_NOREPLACE) {
1309 if (find_vma_intersection(mm, addr, addr + len))
1310 return -EEXIST;
1311 }
1312
1313 if (prot == PROT_EXEC) {
1314 pkey = execute_only_pkey(mm);
1315 if (pkey < 0)
1316 pkey = 0;
1317 }
1318
1319 /* Do simple checking here so the lower-level routines won't have
1320 * to. we assume access permissions have been handled by the open
1321 * of the memory object, so we don't do any here.
1322 */
1323 vm_flags = calc_vm_prot_bits(prot, pkey) | calc_vm_flag_bits(flags) |
1324 mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
1325
1326 if (flags & MAP_LOCKED)
1327 if (!can_do_mlock())
1328 return -EPERM;
1329
1330 if (mlock_future_check(mm, vm_flags, len))
1331 return -EAGAIN;
1332
1333 if (file) {
1334 struct inode *inode = file_inode(file);
1335 unsigned long flags_mask;
1336
1337 if (!file_mmap_ok(file, inode, pgoff, len))
1338 return -EOVERFLOW;
1339
1340 flags_mask = LEGACY_MAP_MASK | file->f_op->mmap_supported_flags;
1341
1342 switch (flags & MAP_TYPE) {
1343 case MAP_SHARED:
1344 /*
1345 * Force use of MAP_SHARED_VALIDATE with non-legacy
1346 * flags. E.g. MAP_SYNC is dangerous to use with
1347 * MAP_SHARED as you don't know which consistency model
1348 * you will get. We silently ignore unsupported flags
1349 * with MAP_SHARED to preserve backward compatibility.
1350 */
1351 flags &= LEGACY_MAP_MASK;
1352 fallthrough;
1353 case MAP_SHARED_VALIDATE:
1354 if (flags & ~flags_mask)
1355 return -EOPNOTSUPP;
1356 if (prot & PROT_WRITE) {
1357 if (!(file->f_mode & FMODE_WRITE))
1358 return -EACCES;
1359 if (IS_SWAPFILE(file->f_mapping->host))
1360 return -ETXTBSY;
1361 }
1362
1363 /*
1364 * Make sure we don't allow writing to an append-only
1365 * file..
1366 */
1367 if (IS_APPEND(inode) && (file->f_mode & FMODE_WRITE))
1368 return -EACCES;
1369
1370 vm_flags |= VM_SHARED | VM_MAYSHARE;
1371 if (!(file->f_mode & FMODE_WRITE))
1372 vm_flags &= ~(VM_MAYWRITE | VM_SHARED);
1373 fallthrough;
1374 case MAP_PRIVATE:
1375 if (!(file->f_mode & FMODE_READ))
1376 return -EACCES;
1377 if (path_noexec(&file->f_path)) {
1378 if (vm_flags & VM_EXEC)
1379 return -EPERM;
1380 vm_flags &= ~VM_MAYEXEC;
1381 }
1382
1383 if (!file->f_op->mmap)
1384 return -ENODEV;
1385 if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
1386 return -EINVAL;
1387 break;
1388
1389 default:
1390 return -EINVAL;
1391 }
1392 } else {
1393 switch (flags & MAP_TYPE) {
1394 case MAP_SHARED:
1395 if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
1396 return -EINVAL;
1397 /*
1398 * Ignore pgoff.
1399 */
1400 pgoff = 0;
1401 vm_flags |= VM_SHARED | VM_MAYSHARE;
1402 break;
1403 case MAP_PRIVATE:
1404 /*
1405 * Set pgoff according to addr for anon_vma.
1406 */
1407 pgoff = addr >> PAGE_SHIFT;
1408 break;
1409 default:
1410 return -EINVAL;
1411 }
1412 }
1413
1414 /*
1415 * Set 'VM_NORESERVE' if we should not account for the
1416 * memory use of this mapping.
1417 */
1418 if (flags & MAP_NORESERVE) {
1419 /* We honor MAP_NORESERVE if allowed to overcommit */
1420 if (sysctl_overcommit_memory != OVERCOMMIT_NEVER)
1421 vm_flags |= VM_NORESERVE;
1422
1423 /* hugetlb applies strict overcommit unless MAP_NORESERVE */
1424 if (file && is_file_hugepages(file))
1425 vm_flags |= VM_NORESERVE;
1426 }
1427
1428 addr = mmap_region(file, addr, len, vm_flags, pgoff, uf);
1429 if (!IS_ERR_VALUE(addr) &&
1430 ((vm_flags & VM_LOCKED) ||
1431 (flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE))
1432 *populate = len;
1433
--
0-DAY CI Kernel Test Service
https://01.org/lkp
[-- Attachment #2: config --]
[-- Type: text/plain, Size: 29445 bytes --]
#
# Automatically generated file; DO NOT EDIT.
# Linux/i386 6.1.0-rc3 Kernel Configuration
#
CONFIG_CC_VERSION_TEXT="gcc-11 (Debian 11.3.0-8) 11.3.0"
CONFIG_CC_IS_GCC=y
CONFIG_GCC_VERSION=110300
CONFIG_CLANG_VERSION=0
CONFIG_AS_IS_GNU=y
CONFIG_AS_VERSION=23900
CONFIG_LD_IS_BFD=y
CONFIG_LD_VERSION=23900
CONFIG_LLD_VERSION=0
CONFIG_CC_CAN_LINK=y
CONFIG_CC_CAN_LINK_STATIC=y
CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
CONFIG_CC_HAS_ASM_INLINE=y
CONFIG_CC_HAS_NO_PROFILE_FN_ATTR=y
CONFIG_PAHOLE_VERSION=123
CONFIG_IRQ_WORK=y
CONFIG_BUILDTIME_TABLE_SORT=y
CONFIG_THREAD_INFO_IN_TASK=y
#
# General setup
#
CONFIG_BROKEN_ON_SMP=y
CONFIG_INIT_ENV_ARG_LIMIT=32
# CONFIG_COMPILE_TEST is not set
# CONFIG_WERROR is not set
CONFIG_LOCALVERSION=""
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_BUILD_SALT=""
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_BZIP2=y
CONFIG_HAVE_KERNEL_LZMA=y
CONFIG_HAVE_KERNEL_XZ=y
CONFIG_HAVE_KERNEL_LZO=y
CONFIG_HAVE_KERNEL_LZ4=y
CONFIG_HAVE_KERNEL_ZSTD=y
# CONFIG_KERNEL_GZIP is not set
# CONFIG_KERNEL_BZIP2 is not set
# CONFIG_KERNEL_LZMA is not set
CONFIG_KERNEL_XZ=y
# CONFIG_KERNEL_LZO is not set
# CONFIG_KERNEL_LZ4 is not set
# CONFIG_KERNEL_ZSTD is not set
CONFIG_DEFAULT_INIT=""
CONFIG_DEFAULT_HOSTNAME="(none)"
# CONFIG_SYSVIPC is not set
# CONFIG_WATCH_QUEUE is not set
# CONFIG_CROSS_MEMORY_ATTACH is not set
# CONFIG_USELIB is not set
CONFIG_HAVE_ARCH_AUDITSYSCALL=y
#
# IRQ subsystem
#
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_IRQ_SHOW=y
CONFIG_HARDIRQS_SW_RESEND=y
CONFIG_GENERIC_IRQ_RESERVATION_MODE=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_SPARSE_IRQ=y
# end of IRQ subsystem
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_ARCH_CLOCKSOURCE_INIT=y
CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE=y
CONFIG_GENERIC_TIME_VSYSCALL=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y
CONFIG_GENERIC_CMOS_UPDATE=y
CONFIG_HAVE_POSIX_CPU_TIMERS_TASK_WORK=y
#
# Timers subsystem
#
CONFIG_HZ_PERIODIC=y
# CONFIG_NO_HZ_IDLE is not set
# CONFIG_NO_HZ is not set
# CONFIG_HIGH_RES_TIMERS is not set
CONFIG_CLOCKSOURCE_WATCHDOG_MAX_SKEW_US=100
# end of Timers subsystem
CONFIG_HAVE_EBPF_JIT=y
#
# BPF subsystem
#
# CONFIG_BPF_SYSCALL is not set
# end of BPF subsystem
CONFIG_PREEMPT_NONE_BUILD=y
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
# CONFIG_PREEMPT_DYNAMIC is not set
#
# CPU/Task time and stats accounting
#
CONFIG_TICK_CPU_ACCOUNTING=y
# CONFIG_IRQ_TIME_ACCOUNTING is not set
# CONFIG_PSI is not set
# end of CPU/Task time and stats accounting
#
# RCU Subsystem
#
CONFIG_TINY_RCU=y
# CONFIG_RCU_EXPERT is not set
CONFIG_SRCU=y
CONFIG_TINY_SRCU=y
# end of RCU Subsystem
# CONFIG_IKCONFIG is not set
CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
#
# Scheduler features
#
# end of Scheduler features
CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH=y
CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough=5"
CONFIG_GCC12_NO_ARRAY_BOUNDS=y
# CONFIG_CGROUPS is not set
# CONFIG_SCHED_AUTOGROUP is not set
# CONFIG_RELAY is not set
# CONFIG_BLK_DEV_INITRD is not set
# CONFIG_BOOT_CONFIG is not set
# CONFIG_INITRAMFS_PRESERVE_MTIME is not set
# CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE is not set
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_LD_ORPHAN_WARN=y
CONFIG_HAVE_UID16=y
CONFIG_SYSCTL_EXCEPTION_TRACE=y
CONFIG_HAVE_PCSPKR_PLATFORM=y
CONFIG_EXPERT=y
# CONFIG_MULTIUSER is not set
# CONFIG_SGETMASK_SYSCALL is not set
# CONFIG_SYSFS_SYSCALL is not set
# CONFIG_FHANDLE is not set
# CONFIG_POSIX_TIMERS is not set
# CONFIG_PRINTK is not set
# CONFIG_BUG is not set
# CONFIG_PCSPKR_PLATFORM is not set
# CONFIG_BASE_FULL is not set
# CONFIG_FUTEX is not set
# CONFIG_EPOLL is not set
# CONFIG_SIGNALFD is not set
# CONFIG_TIMERFD is not set
# CONFIG_EVENTFD is not set
# CONFIG_SHMEM is not set
# CONFIG_AIO is not set
# CONFIG_IO_URING is not set
# CONFIG_ADVISE_SYSCALLS is not set
# CONFIG_MEMBARRIER is not set
# CONFIG_KALLSYMS is not set
CONFIG_ARCH_HAS_MEMBARRIER_SYNC_CORE=y
# CONFIG_KCMP is not set
# CONFIG_RSEQ is not set
CONFIG_EMBEDDED=y
CONFIG_HAVE_PERF_EVENTS=y
# CONFIG_PC104 is not set
#
# Kernel Performance Events And Counters
#
CONFIG_PERF_EVENTS=y
# CONFIG_DEBUG_PERF_USE_VMALLOC is not set
# end of Kernel Performance Events And Counters
# CONFIG_PROFILING is not set
# end of General setup
CONFIG_X86_32=y
CONFIG_X86=y
CONFIG_INSTRUCTION_DECODER=y
CONFIG_OUTPUT_FORMAT="elf32-i386"
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_MMU=y
CONFIG_ARCH_MMAP_RND_BITS_MIN=8
CONFIG_ARCH_MMAP_RND_BITS_MAX=16
CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=8
CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=16
CONFIG_GENERIC_ISA_DMA=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_ARCH_HAS_CPU_RELAX=y
CONFIG_ARCH_HIBERNATION_POSSIBLE=y
CONFIG_ARCH_NR_GPIO=512
CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_ARCH_SUPPORTS_UPROBES=y
CONFIG_FIX_EARLYCON_MEM=y
CONFIG_PGTABLE_LEVELS=2
CONFIG_CC_HAS_SANE_STACKPROTECTOR=y
#
# Processor type and features
#
# CONFIG_SMP is not set
# CONFIG_X86_FEATURE_NAMES is not set
# CONFIG_GOLDFISH is not set
# CONFIG_X86_CPU_RESCTRL is not set
# CONFIG_X86_EXTENDED_PLATFORM is not set
# CONFIG_X86_32_IRIS is not set
# CONFIG_SCHED_OMIT_FRAME_POINTER is not set
# CONFIG_HYPERVISOR_GUEST is not set
# CONFIG_M486SX is not set
# CONFIG_M486 is not set
# CONFIG_M586 is not set
# CONFIG_M586TSC is not set
# CONFIG_M586MMX is not set
CONFIG_M686=y
# CONFIG_MPENTIUMII is not set
# CONFIG_MPENTIUMIII is not set
# CONFIG_MPENTIUMM is not set
# CONFIG_MPENTIUM4 is not set
# CONFIG_MK6 is not set
# CONFIG_MK7 is not set
# CONFIG_MK8 is not set
# CONFIG_MCRUSOE is not set
# CONFIG_MEFFICEON is not set
# CONFIG_MWINCHIPC6 is not set
# CONFIG_MWINCHIP3D is not set
# CONFIG_MELAN is not set
# CONFIG_MGEODEGX1 is not set
# CONFIG_MGEODE_LX is not set
# CONFIG_MCYRIXIII is not set
# CONFIG_MVIAC3_2 is not set
# CONFIG_MVIAC7 is not set
# CONFIG_MCORE2 is not set
# CONFIG_MATOM is not set
# CONFIG_X86_GENERIC is not set
CONFIG_X86_INTERNODE_CACHE_SHIFT=5
CONFIG_X86_L1_CACHE_SHIFT=5
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_TSC=y
CONFIG_X86_CMPXCHG64=y
CONFIG_X86_CMOV=y
CONFIG_X86_MINIMUM_CPU_FAMILY=6
CONFIG_X86_DEBUGCTLMSR=y
CONFIG_IA32_FEAT_CTL=y
# CONFIG_PROCESSOR_SELECT is not set
CONFIG_CPU_SUP_INTEL=y
CONFIG_CPU_SUP_CYRIX_32=y
CONFIG_CPU_SUP_AMD=y
CONFIG_CPU_SUP_HYGON=y
CONFIG_CPU_SUP_CENTAUR=y
CONFIG_CPU_SUP_TRANSMETA_32=y
CONFIG_CPU_SUP_UMC_32=y
CONFIG_CPU_SUP_ZHAOXIN=y
CONFIG_CPU_SUP_VORTEX_32=y
# CONFIG_HPET_TIMER is not set
# CONFIG_DMI is not set
CONFIG_NR_CPUS_RANGE_BEGIN=1
CONFIG_NR_CPUS_RANGE_END=1
CONFIG_NR_CPUS_DEFAULT=1
CONFIG_NR_CPUS=1
# CONFIG_X86_UP_APIC is not set
# CONFIG_X86_MCE is not set
#
# Performance monitoring
#
# CONFIG_PERF_EVENTS_AMD_POWER is not set
# CONFIG_PERF_EVENTS_AMD_UNCORE is not set
# CONFIG_PERF_EVENTS_AMD_BRS is not set
# end of Performance monitoring
# CONFIG_X86_LEGACY_VM86 is not set
# CONFIG_X86_IOPL_IOPERM is not set
# CONFIG_TOSHIBA is not set
# CONFIG_X86_REBOOTFIXUPS is not set
# CONFIG_MICROCODE is not set
# CONFIG_X86_MSR is not set
# CONFIG_X86_CPUID is not set
CONFIG_NOHIGHMEM=y
# CONFIG_HIGHMEM4G is not set
# CONFIG_HIGHMEM64G is not set
CONFIG_VMSPLIT_3G=y
# CONFIG_VMSPLIT_3G_OPT is not set
# CONFIG_VMSPLIT_2G is not set
# CONFIG_VMSPLIT_2G_OPT is not set
# CONFIG_VMSPLIT_1G is not set
CONFIG_PAGE_OFFSET=0xC0000000
# CONFIG_X86_PAE is not set
CONFIG_ARCH_FLATMEM_ENABLE=y
CONFIG_ARCH_SPARSEMEM_ENABLE=y
CONFIG_ARCH_SELECT_MEMORY_MODEL=y
CONFIG_ILLEGAL_POINTER_VALUE=0
# CONFIG_X86_CHECK_BIOS_CORRUPTION is not set
# CONFIG_MTRR is not set
# CONFIG_X86_UMIP is not set
CONFIG_CC_HAS_IBT=y
CONFIG_X86_INTEL_TSX_MODE_OFF=y
# CONFIG_X86_INTEL_TSX_MODE_ON is not set
# CONFIG_X86_INTEL_TSX_MODE_AUTO is not set
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=250
# CONFIG_KEXEC is not set
CONFIG_PHYSICAL_START=0x1000000
# CONFIG_RELOCATABLE is not set
CONFIG_PHYSICAL_ALIGN=0x200000
# CONFIG_COMPAT_VDSO is not set
# CONFIG_CMDLINE_BOOL is not set
# CONFIG_MODIFY_LDT_SYSCALL is not set
# CONFIG_STRICT_SIGALTSTACK_SIZE is not set
# end of Processor type and features
CONFIG_CC_HAS_SLS=y
CONFIG_CC_HAS_RETURN_THUNK=y
# CONFIG_SPECULATION_MITIGATIONS is not set
CONFIG_ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE=y
#
# Power management and ACPI options
#
# CONFIG_SUSPEND is not set
# CONFIG_PM is not set
CONFIG_ARCH_SUPPORTS_ACPI=y
# CONFIG_ACPI is not set
#
# CPU Frequency scaling
#
# CONFIG_CPU_FREQ is not set
# end of CPU Frequency scaling
#
# CPU Idle
#
# CONFIG_CPU_IDLE is not set
# end of CPU Idle
# end of Power management and ACPI options
#
# Bus options (PCI etc.)
#
# CONFIG_ISA_BUS is not set
CONFIG_ISA_DMA_API=y
# CONFIG_ISA is not set
# CONFIG_SCx200 is not set
# CONFIG_OLPC is not set
# CONFIG_ALIX is not set
# CONFIG_NET5501 is not set
# end of Bus options (PCI etc.)
#
# Binary Emulations
#
CONFIG_COMPAT_32=y
# end of Binary Emulations
CONFIG_HAVE_ATOMIC_IOMAP=y
CONFIG_HAVE_KVM=y
# CONFIG_VIRTUALIZATION is not set
CONFIG_AS_AVX512=y
CONFIG_AS_SHA1_NI=y
CONFIG_AS_SHA256_NI=y
CONFIG_AS_TPAUSE=y
#
# General architecture-dependent options
#
CONFIG_GENERIC_ENTRY=y
# CONFIG_JUMP_LABEL is not set
# CONFIG_STATIC_CALL_SELFTEST is not set
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
CONFIG_ARCH_USE_BUILTIN_BSWAP=y
CONFIG_HAVE_IOREMAP_PROT=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_HAVE_OPTPROBES=y
CONFIG_HAVE_KPROBES_ON_FTRACE=y
CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE=y
CONFIG_HAVE_FUNCTION_ERROR_INJECTION=y
CONFIG_HAVE_NMI=y
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_TRACE_IRQFLAGS_NMI_SUPPORT=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
CONFIG_HAVE_DMA_CONTIGUOUS=y
CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_ARCH_HAS_FORTIFY_SOURCE=y
CONFIG_ARCH_HAS_SET_MEMORY=y
CONFIG_ARCH_HAS_SET_DIRECT_MAP=y
CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST=y
CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT=y
CONFIG_ARCH_WANTS_NO_INSTR=y
CONFIG_ARCH_32BIT_OFF_T=y
CONFIG_HAVE_ASM_MODVERSIONS=y
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
CONFIG_HAVE_RSEQ=y
CONFIG_HAVE_FUNCTION_ARG_ACCESS_API=y
CONFIG_HAVE_HW_BREAKPOINT=y
CONFIG_HAVE_MIXED_BREAKPOINTS_REGS=y
CONFIG_HAVE_USER_RETURN_NOTIFIER=y
CONFIG_HAVE_PERF_EVENTS_NMI=y
CONFIG_HAVE_HARDLOCKUP_DETECTOR_PERF=y
CONFIG_HAVE_PERF_REGS=y
CONFIG_HAVE_PERF_USER_STACK_DUMP=y
CONFIG_HAVE_ARCH_JUMP_LABEL=y
CONFIG_HAVE_ARCH_JUMP_LABEL_RELATIVE=y
CONFIG_MMU_GATHER_MERGE_VMAS=y
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
CONFIG_HAVE_CMPXCHG_LOCAL=y
CONFIG_HAVE_CMPXCHG_DOUBLE=y
CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
CONFIG_HAVE_ARCH_SECCOMP=y
CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
# CONFIG_SECCOMP is not set
CONFIG_HAVE_ARCH_STACKLEAK=y
CONFIG_HAVE_STACKPROTECTOR=y
# CONFIG_STACKPROTECTOR is not set
CONFIG_ARCH_SUPPORTS_LTO_CLANG=y
CONFIG_ARCH_SUPPORTS_LTO_CLANG_THIN=y
CONFIG_LTO_NONE=y
CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES=y
CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
CONFIG_HAVE_MOVE_PUD=y
CONFIG_HAVE_MOVE_PMD=y
CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
CONFIG_ARCH_WANT_HUGE_PMD_SHARE=y
CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
CONFIG_MODULES_USE_ELF_REL=y
CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK=y
CONFIG_SOFTIRQ_ON_OWN_STACK=y
CONFIG_ARCH_HAS_ELF_RANDOMIZE=y
CONFIG_HAVE_ARCH_MMAP_RND_BITS=y
CONFIG_HAVE_EXIT_THREAD=y
CONFIG_ARCH_MMAP_RND_BITS=8
CONFIG_PAGE_SIZE_LESS_THAN_64KB=y
CONFIG_PAGE_SIZE_LESS_THAN_256KB=y
CONFIG_CLONE_BACKWARDS=y
CONFIG_OLD_SIGSUSPEND3=y
CONFIG_OLD_SIGACTION=y
# CONFIG_COMPAT_32BIT_TIME is not set
CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET=y
# CONFIG_RANDOMIZE_KSTACK_OFFSET is not set
CONFIG_ARCH_HAS_STRICT_KERNEL_RWX=y
CONFIG_STRICT_KERNEL_RWX=y
CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
CONFIG_HAVE_ARCH_PREL32_RELOCATIONS=y
CONFIG_ARCH_HAS_MEM_ENCRYPT=y
CONFIG_HAVE_STATIC_CALL=y
CONFIG_HAVE_PREEMPT_DYNAMIC=y
CONFIG_HAVE_PREEMPT_DYNAMIC_CALL=y
CONFIG_ARCH_WANT_LD_ORPHAN_WARN=y
CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
CONFIG_ARCH_SPLIT_ARG64=y
CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH=y
CONFIG_DYNAMIC_SIGFRAME=y
#
# GCOV-based kernel profiling
#
CONFIG_ARCH_HAS_GCOV_PROFILE_ALL=y
# end of GCOV-based kernel profiling
CONFIG_HAVE_GCC_PLUGINS=y
# CONFIG_GCC_PLUGINS is not set
# end of General architecture-dependent options
CONFIG_BASE_SMALL=1
# CONFIG_MODULES is not set
# CONFIG_BLOCK is not set
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y
CONFIG_INLINE_WRITE_UNLOCK=y
CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
CONFIG_ARCH_USE_QUEUED_SPINLOCKS=y
CONFIG_ARCH_USE_QUEUED_RWLOCKS=y
CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE=y
CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE=y
CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y
#
# Executable file formats
#
# CONFIG_BINFMT_ELF is not set
# CONFIG_BINFMT_SCRIPT is not set
# CONFIG_BINFMT_MISC is not set
# CONFIG_COREDUMP is not set
# end of Executable file formats
#
# Memory Management options
#
#
# SLAB allocator options
#
# CONFIG_SLAB is not set
# CONFIG_SLUB is not set
CONFIG_SLOB=y
# end of SLAB allocator options
# CONFIG_SHUFFLE_PAGE_ALLOCATOR is not set
# CONFIG_COMPAT_BRK is not set
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
# CONFIG_SPARSEMEM_MANUAL is not set
CONFIG_FLATMEM=y
CONFIG_SPARSEMEM_STATIC=y
CONFIG_HAVE_FAST_GUP=y
CONFIG_EXCLUSIVE_SYSTEM_RAM=y
CONFIG_SPLIT_PTLOCK_CPUS=4
# CONFIG_COMPACTION is not set
# CONFIG_PAGE_REPORTING is not set
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
# CONFIG_TRANSPARENT_HUGEPAGE is not set
CONFIG_NEED_PER_CPU_KM=y
CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
# CONFIG_CMA is not set
CONFIG_GENERIC_EARLY_IOREMAP=y
CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
CONFIG_ARCH_HAS_CURRENT_STACK_POINTER=y
CONFIG_ARCH_HAS_ZONE_DMA_SET=y
# CONFIG_ZONE_DMA is not set
# CONFIG_VM_EVENT_COUNTERS is not set
# CONFIG_PERCPU_STATS is not set
#
# GUP_TEST needs to have DEBUG_FS enabled
#
CONFIG_ARCH_HAS_PTE_SPECIAL=y
CONFIG_KMAP_LOCAL=y
# CONFIG_USERFAULTFD is not set
# CONFIG_LRU_GEN is not set
#
# Data Access Monitoring
#
# CONFIG_DAMON is not set
# end of Data Access Monitoring
# end of Memory Management options
# CONFIG_NET is not set
#
# Device Drivers
#
CONFIG_HAVE_EISA=y
# CONFIG_EISA is not set
CONFIG_HAVE_PCI=y
# CONFIG_PCI is not set
# CONFIG_PCCARD is not set
#
# Generic Driver Options
#
# CONFIG_UEVENT_HELPER is not set
# CONFIG_DEVTMPFS is not set
# CONFIG_STANDALONE is not set
# CONFIG_PREVENT_FIRMWARE_BUILD is not set
#
# Firmware loader
#
# CONFIG_FW_LOADER is not set
# end of Firmware loader
# CONFIG_ALLOW_DEV_COREDUMP is not set
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_DEBUG_TEST_DRIVER_REMOVE is not set
CONFIG_GENERIC_CPU_AUTOPROBE=y
CONFIG_GENERIC_CPU_VULNERABILITIES=y
# end of Generic Driver Options
#
# Bus devices
#
# CONFIG_MHI_BUS is not set
# CONFIG_MHI_BUS_EP is not set
# end of Bus devices
#
# Firmware Drivers
#
#
# ARM System Control and Management Interface Protocol
#
# end of ARM System Control and Management Interface Protocol
# CONFIG_EDD is not set
# CONFIG_FIRMWARE_MEMMAP is not set
# CONFIG_SYSFB_SIMPLEFB is not set
# CONFIG_GOOGLE_FIRMWARE is not set
#
# Tegra firmware driver
#
# end of Tegra firmware driver
# end of Firmware Drivers
# CONFIG_GNSS is not set
# CONFIG_MTD is not set
# CONFIG_OF is not set
CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
# CONFIG_PARPORT is not set
#
# NVME Support
#
# end of NVME Support
#
# Misc devices
#
# CONFIG_DUMMY_IRQ is not set
# CONFIG_ENCLOSURE_SERVICES is not set
# CONFIG_SRAM is not set
# CONFIG_XILINX_SDFEC is not set
# CONFIG_C2PORT is not set
#
# EEPROM support
#
# CONFIG_EEPROM_93CX6 is not set
# end of EEPROM support
#
# Texas Instruments shared transport line discipline
#
# end of Texas Instruments shared transport line discipline
#
# Altera FPGA firmware download module (requires I2C)
#
# CONFIG_ECHO is not set
# CONFIG_PVPANIC is not set
# end of Misc devices
#
# SCSI device support
#
# end of SCSI device support
# CONFIG_MACINTOSH_DRIVERS is not set
#
# Input device support
#
# CONFIG_INPUT is not set
#
# Hardware I/O ports
#
# CONFIG_SERIO is not set
CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
# CONFIG_GAMEPORT is not set
# end of Hardware I/O ports
# end of Input device support
#
# Character devices
#
# CONFIG_TTY is not set
# CONFIG_SERIAL_DEV_BUS is not set
# CONFIG_IPMI_HANDLER is not set
# CONFIG_HW_RANDOM is not set
# CONFIG_PC8736x_GPIO is not set
# CONFIG_NSC_GPIO is not set
# CONFIG_DEVMEM is not set
# CONFIG_NVRAM is not set
# CONFIG_HANGCHECK_TIMER is not set
# CONFIG_TCG_TPM is not set
# CONFIG_TELCLOCK is not set
# CONFIG_RANDOM_TRUST_CPU is not set
# CONFIG_RANDOM_TRUST_BOOTLOADER is not set
# end of Character devices
#
# I2C support
#
# CONFIG_I2C is not set
# end of I2C support
# CONFIG_I3C is not set
# CONFIG_SPI is not set
# CONFIG_SPMI is not set
# CONFIG_HSI is not set
# CONFIG_PPS is not set
#
# PTP clock support
#
CONFIG_PTP_1588_CLOCK_OPTIONAL=y
#
# Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
#
# end of PTP clock support
# CONFIG_PINCTRL is not set
# CONFIG_GPIOLIB is not set
# CONFIG_W1 is not set
# CONFIG_POWER_RESET is not set
# CONFIG_POWER_SUPPLY is not set
# CONFIG_HWMON is not set
# CONFIG_THERMAL is not set
# CONFIG_WATCHDOG is not set
CONFIG_SSB_POSSIBLE=y
# CONFIG_SSB is not set
CONFIG_BCMA_POSSIBLE=y
# CONFIG_BCMA is not set
#
# Multifunction device drivers
#
# CONFIG_MFD_MADERA is not set
# CONFIG_HTC_PASIC3 is not set
# CONFIG_MFD_KEMPLD is not set
# CONFIG_MFD_MT6397 is not set
# CONFIG_MFD_SM501 is not set
# CONFIG_MFD_SYSCON is not set
# CONFIG_MFD_TI_AM335X_TSCADC is not set
# CONFIG_MFD_TQMX86 is not set
# end of Multifunction device drivers
# CONFIG_REGULATOR is not set
#
# CEC support
#
# CONFIG_MEDIA_CEC_SUPPORT is not set
# end of CEC support
# CONFIG_MEDIA_SUPPORT is not set
#
# Graphics support
#
# CONFIG_DRM is not set
# CONFIG_DRM_DEBUG_MODESET_LOCK is not set
#
# ARM devices
#
# end of ARM devices
#
# Frame buffer Devices
#
# CONFIG_FB is not set
# end of Frame buffer Devices
#
# Backlight & LCD device support
#
# CONFIG_LCD_CLASS_DEVICE is not set
# CONFIG_BACKLIGHT_CLASS_DEVICE is not set
# end of Backlight & LCD device support
# end of Graphics support
# CONFIG_SOUND is not set
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
# CONFIG_USB_SUPPORT is not set
# CONFIG_MMC is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_ACCESSIBILITY is not set
CONFIG_EDAC_ATOMIC_SCRUB=y
CONFIG_EDAC_SUPPORT=y
CONFIG_RTC_LIB=y
CONFIG_RTC_MC146818_LIB=y
# CONFIG_RTC_CLASS is not set
# CONFIG_DMADEVICES is not set
#
# DMABUF options
#
# CONFIG_SYNC_FILE is not set
# CONFIG_DMABUF_HEAPS is not set
# end of DMABUF options
# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set
# CONFIG_VFIO is not set
# CONFIG_VIRT_DRIVERS is not set
# CONFIG_VIRTIO_MENU is not set
# CONFIG_VHOST_MENU is not set
#
# Microsoft Hyper-V guest support
#
# end of Microsoft Hyper-V guest support
# CONFIG_COMEDI is not set
# CONFIG_STAGING is not set
# CONFIG_CHROME_PLATFORMS is not set
# CONFIG_MELLANOX_PLATFORM is not set
# CONFIG_SURFACE_PLATFORMS is not set
# CONFIG_X86_PLATFORM_DEVICES is not set
# CONFIG_COMMON_CLK is not set
# CONFIG_HWSPINLOCK is not set
#
# Clock Source drivers
#
CONFIG_CLKSRC_I8253=y
CONFIG_CLKEVT_I8253=y
CONFIG_CLKBLD_I8253=y
# end of Clock Source drivers
# CONFIG_MAILBOX is not set
# CONFIG_IOMMU_SUPPORT is not set
#
# Remoteproc drivers
#
# CONFIG_REMOTEPROC is not set
# end of Remoteproc drivers
#
# Rpmsg drivers
#
# CONFIG_RPMSG_VIRTIO is not set
# end of Rpmsg drivers
#
# SOC (System On Chip) specific Drivers
#
#
# Amlogic SoC drivers
#
# end of Amlogic SoC drivers
#
# Broadcom SoC drivers
#
# end of Broadcom SoC drivers
#
# NXP/Freescale QorIQ SoC drivers
#
# end of NXP/Freescale QorIQ SoC drivers
#
# fujitsu SoC drivers
#
# end of fujitsu SoC drivers
#
# i.MX SoC drivers
#
# end of i.MX SoC drivers
#
# Enable LiteX SoC Builder specific drivers
#
# end of Enable LiteX SoC Builder specific drivers
#
# Qualcomm SoC drivers
#
# end of Qualcomm SoC drivers
# CONFIG_SOC_TI is not set
#
# Xilinx SoC drivers
#
# end of Xilinx SoC drivers
# end of SOC (System On Chip) specific Drivers
# CONFIG_PM_DEVFREQ is not set
# CONFIG_EXTCON is not set
# CONFIG_MEMORY is not set
# CONFIG_IIO is not set
# CONFIG_PWM is not set
#
# IRQ chip support
#
# end of IRQ chip support
# CONFIG_IPACK_BUS is not set
# CONFIG_RESET_CONTROLLER is not set
#
# PHY Subsystem
#
# CONFIG_GENERIC_PHY is not set
# CONFIG_PHY_CAN_TRANSCEIVER is not set
#
# PHY drivers for Broadcom platforms
#
# CONFIG_BCM_KONA_USB2_PHY is not set
# end of PHY drivers for Broadcom platforms
# CONFIG_PHY_PXA_28NM_HSIC is not set
# CONFIG_PHY_PXA_28NM_USB2 is not set
# CONFIG_PHY_INTEL_LGM_EMMC is not set
# end of PHY Subsystem
# CONFIG_POWERCAP is not set
# CONFIG_MCB is not set
#
# Performance monitor support
#
# end of Performance monitor support
# CONFIG_RAS is not set
#
# Android
#
# CONFIG_ANDROID_BINDER_IPC is not set
# end of Android
# CONFIG_DAX is not set
# CONFIG_NVMEM is not set
#
# HW tracing support
#
# CONFIG_STM is not set
# CONFIG_INTEL_TH is not set
# end of HW tracing support
# CONFIG_FPGA is not set
# CONFIG_TEE is not set
# CONFIG_SIOX is not set
# CONFIG_SLIMBUS is not set
# CONFIG_INTERCONNECT is not set
# CONFIG_COUNTER is not set
# CONFIG_PECI is not set
# CONFIG_HTE is not set
# end of Device Drivers
#
# File systems
#
CONFIG_DCACHE_WORD_ACCESS=y
# CONFIG_VALIDATE_FS_PARSER is not set
# CONFIG_EXPORTFS_BLOCK_OPS is not set
# CONFIG_FILE_LOCKING is not set
# CONFIG_FS_ENCRYPTION is not set
# CONFIG_FS_VERITY is not set
# CONFIG_DNOTIFY is not set
# CONFIG_INOTIFY_USER is not set
# CONFIG_FANOTIFY is not set
# CONFIG_QUOTA is not set
# CONFIG_AUTOFS4_FS is not set
# CONFIG_AUTOFS_FS is not set
# CONFIG_FUSE_FS is not set
# CONFIG_OVERLAY_FS is not set
#
# Caches
#
# CONFIG_FSCACHE is not set
# end of Caches
#
# Pseudo filesystems
#
# CONFIG_PROC_FS is not set
# CONFIG_SYSFS is not set
# CONFIG_CONFIGFS_FS is not set
# end of Pseudo filesystems
# CONFIG_MISC_FILESYSTEMS is not set
# CONFIG_NLS is not set
# CONFIG_UNICODE is not set
# end of File systems
#
# Security options
#
# CONFIG_KEYS is not set
# CONFIG_SECURITY_DMESG_RESTRICT is not set
# CONFIG_SECURITYFS is not set
# CONFIG_FORTIFY_SOURCE is not set
# CONFIG_STATIC_USERMODEHELPER is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_LSM="landlock,lockdown,yama,loadpin,safesetid,integrity,bpf"
#
# Kernel hardening options
#
#
# Memory initialization
#
CONFIG_INIT_STACK_NONE=y
# CONFIG_INIT_ON_ALLOC_DEFAULT_ON is not set
# CONFIG_INIT_ON_FREE_DEFAULT_ON is not set
CONFIG_CC_HAS_ZERO_CALL_USED_REGS=y
# CONFIG_ZERO_CALL_USED_REGS is not set
# end of Memory initialization
CONFIG_RANDSTRUCT_NONE=y
# end of Kernel hardening options
# end of Security options
# CONFIG_CRYPTO is not set
#
# Library routines
#
# CONFIG_PACKING is not set
CONFIG_GENERIC_STRNCPY_FROM_USER=y
CONFIG_GENERIC_STRNLEN_USER=y
# CONFIG_CORDIC is not set
# CONFIG_PRIME_NUMBERS is not set
CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_GENERIC_IOMAP=y
CONFIG_ARCH_HAS_FAST_MULTIPLIER=y
CONFIG_ARCH_USE_SYM_ANNOTATIONS=y
#
# Crypto library routines
#
CONFIG_CRYPTO_LIB_BLAKE2S_GENERIC=y
# CONFIG_CRYPTO_LIB_CHACHA is not set
# CONFIG_CRYPTO_LIB_CURVE25519 is not set
CONFIG_CRYPTO_LIB_POLY1305_RSIZE=1
# CONFIG_CRYPTO_LIB_POLY1305 is not set
# end of Crypto library routines
# CONFIG_CRC_CCITT is not set
# CONFIG_CRC16 is not set
# CONFIG_CRC_T10DIF is not set
# CONFIG_CRC64_ROCKSOFT is not set
# CONFIG_CRC_ITU_T is not set
# CONFIG_CRC32 is not set
# CONFIG_CRC64 is not set
# CONFIG_CRC4 is not set
# CONFIG_CRC7 is not set
# CONFIG_LIBCRC32C is not set
# CONFIG_CRC8 is not set
# CONFIG_RANDOM32_SELFTEST is not set
# CONFIG_XZ_DEC is not set
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT_MAP=y
CONFIG_HAS_DMA=y
CONFIG_NEED_SG_DMA_LENGTH=y
# CONFIG_DMA_API_DEBUG is not set
# CONFIG_IRQ_POLL is not set
CONFIG_HAVE_GENERIC_VDSO=y
CONFIG_GENERIC_GETTIMEOFDAY=y
CONFIG_GENERIC_VDSO_32=y
CONFIG_GENERIC_VDSO_TIME_NS=y
CONFIG_ARCH_STACKWALK=y
# end of Library routines
#
# Kernel hacking
#
#
# printk and dmesg options
#
CONFIG_CONSOLE_LOGLEVEL_DEFAULT=7
CONFIG_CONSOLE_LOGLEVEL_QUIET=4
CONFIG_MESSAGE_LOGLEVEL_DEFAULT=4
# CONFIG_SYMBOLIC_ERRNAME is not set
# end of printk and dmesg options
CONFIG_DEBUG_KERNEL=y
# CONFIG_DEBUG_MISC is not set
#
# Compile-time checks and compiler options
#
CONFIG_AS_HAS_NON_CONST_LEB128=y
CONFIG_DEBUG_INFO_NONE=y
# CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT is not set
# CONFIG_DEBUG_INFO_DWARF4 is not set
# CONFIG_DEBUG_INFO_DWARF5 is not set
CONFIG_FRAME_WARN=1024
# CONFIG_STRIP_ASM_SYMS is not set
# CONFIG_READABLE_ASM is not set
# CONFIG_HEADERS_INSTALL is not set
CONFIG_DEBUG_SECTION_MISMATCH=y
CONFIG_SECTION_MISMATCH_WARN_ONLY=y
# CONFIG_VMLINUX_MAP is not set
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
# end of Compile-time checks and compiler options
#
# Generic Kernel Debugging Instruments
#
# CONFIG_MAGIC_SYSRQ is not set
# CONFIG_DEBUG_FS is not set
CONFIG_HAVE_ARCH_KGDB=y
# CONFIG_KGDB is not set
CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y
# CONFIG_UBSAN is not set
CONFIG_HAVE_KCSAN_COMPILER=y
# end of Generic Kernel Debugging Instruments
#
# Networking Debugging
#
# end of Networking Debugging
#
# Memory Debugging
#
# CONFIG_PAGE_EXTENSION is not set
# CONFIG_DEBUG_PAGEALLOC is not set
# CONFIG_PAGE_OWNER is not set
# CONFIG_PAGE_POISONING is not set
# CONFIG_DEBUG_RODATA_TEST is not set
CONFIG_ARCH_HAS_DEBUG_WX=y
# CONFIG_DEBUG_WX is not set
CONFIG_GENERIC_PTDUMP=y
# CONFIG_DEBUG_OBJECTS is not set
CONFIG_HAVE_DEBUG_KMEMLEAK=y
# CONFIG_DEBUG_KMEMLEAK is not set
# CONFIG_DEBUG_STACK_USAGE is not set
# CONFIG_SCHED_STACK_END_CHECK is not set
CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE=y
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_VM_PGTABLE is not set
CONFIG_ARCH_HAS_DEBUG_VIRTUAL=y
# CONFIG_DEBUG_VIRTUAL is not set
# CONFIG_DEBUG_MEMORY_INIT is not set
# CONFIG_DEBUG_KMAP_LOCAL is not set
CONFIG_ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP=y
# CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP is not set
CONFIG_HAVE_DEBUG_STACKOVERFLOW=y
# CONFIG_DEBUG_STACKOVERFLOW is not set
CONFIG_CC_HAS_KASAN_GENERIC=y
CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS=y
CONFIG_HAVE_ARCH_KFENCE=y
# end of Memory Debugging
# CONFIG_DEBUG_SHIRQ is not set
#
# Debug Oops, Lockups and Hangs
#
# CONFIG_PANIC_ON_OOPS is not set
CONFIG_PANIC_ON_OOPS_VALUE=0
CONFIG_PANIC_TIMEOUT=0
# CONFIG_SOFTLOCKUP_DETECTOR is not set
# CONFIG_HARDLOCKUP_DETECTOR is not set
# CONFIG_DETECT_HUNG_TASK is not set
# CONFIG_WQ_WATCHDOG is not set
# end of Debug Oops, Lockups and Hangs
#
# Scheduler Debugging
#
# end of Scheduler Debugging
# CONFIG_DEBUG_TIMEKEEPING is not set
#
# Lock Debugging (spinlocks, mutexes, etc...)
#
CONFIG_LOCK_DEBUGGING_SUPPORT=y
# CONFIG_PROVE_LOCKING is not set
# CONFIG_LOCK_STAT is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
# CONFIG_DEBUG_RWSEMS is not set
# CONFIG_DEBUG_LOCK_ALLOC is not set
# CONFIG_DEBUG_ATOMIC_SLEEP is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_LOCK_TORTURE_TEST is not set
# CONFIG_WW_MUTEX_SELFTEST is not set
# CONFIG_SCF_TORTURE_TEST is not set
# end of Lock Debugging (spinlocks, mutexes, etc...)
# CONFIG_DEBUG_IRQFLAGS is not set
# CONFIG_STACKTRACE is not set
# CONFIG_WARN_ALL_UNSEEDED_RANDOM is not set
# CONFIG_DEBUG_KOBJECT is not set
#
# Debug kernel data structures
#
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_PLIST is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_DEBUG_NOTIFIERS is not set
# CONFIG_BUG_ON_DATA_CORRUPTION is not set
# CONFIG_DEBUG_MAPLE_TREE is not set
# end of Debug kernel data structures
# CONFIG_DEBUG_CREDENTIALS is not set
#
# RCU Debugging
#
# CONFIG_RCU_SCALE_TEST is not set
# CONFIG_RCU_TORTURE_TEST is not set
# CONFIG_RCU_REF_SCALE_TEST is not set
# CONFIG_RCU_TRACE is not set
# CONFIG_RCU_EQS_DEBUG is not set
# end of RCU Debugging
# CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
CONFIG_USER_STACKTRACE_SUPPORT=y
CONFIG_HAVE_RETHOOK=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y
CONFIG_HAVE_DYNAMIC_FTRACE_NO_PATCHABLE=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_HAVE_C_RECORDMCOUNT=y
CONFIG_HAVE_BUILDTIME_MCOUNT_SORT=y
CONFIG_TRACING_SUPPORT=y
# CONFIG_FTRACE is not set
# CONFIG_SAMPLES is not set
CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
#
# x86 Debugging
#
# CONFIG_X86_VERBOSE_BOOTUP is not set
# CONFIG_EARLY_PRINTK is not set
# CONFIG_DEBUG_TLBFLUSH is not set
CONFIG_HAVE_MMIOTRACE_SUPPORT=y
# CONFIG_X86_DECODER_SELFTEST is not set
CONFIG_IO_DELAY_0X80=y
# CONFIG_IO_DELAY_0XED is not set
# CONFIG_IO_DELAY_UDELAY is not set
# CONFIG_IO_DELAY_NONE is not set
# CONFIG_CPA_DEBUG is not set
# CONFIG_DEBUG_ENTRY is not set
# CONFIG_X86_DEBUG_FPU is not set
# CONFIG_UNWINDER_FRAME_POINTER is not set
CONFIG_UNWINDER_GUESS=y
# end of x86 Debugging
#
# Kernel Testing and Coverage
#
# CONFIG_KUNIT is not set
# CONFIG_NOTIFIER_ERROR_INJECTION is not set
# CONFIG_FAULT_INJECTION is not set
CONFIG_CC_HAS_SANCOV_TRACE_PC=y
# CONFIG_RUNTIME_TESTING_MENU is not set
CONFIG_ARCH_USE_MEMTEST=y
# CONFIG_MEMTEST is not set
# end of Kernel Testing and Coverage
#
# Rust hacking
#
# end of Rust hacking
# end of Kernel hacking
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [RFC PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support
2023-01-20 16:08 ` [RFC RESEND " Khalid Aziz
(?)
(?)
@ 2022-12-06 18:07 ` kernel test robot
-1 siblings, 0 replies; 8+ messages in thread
From: kernel test robot @ 2022-12-06 18:07 UTC (permalink / raw)
To: Khalid Aziz; +Cc: oe-kbuild-all
[-- Attachment #1: Type: text/plain, Size: 3949 bytes --]
Hi Khalid,
[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on arnd-asm-generic/master]
[also build test ERROR on soc/for-next linus/master v6.1-rc8 next-20221206]
[cannot apply to akpm-mm/mm-everything]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Khalid-Aziz/Add-support-for-sharing-page-tables-across-processes-Previously-mshare/20221206-234256
base: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
patch link: https://lore.kernel.org/r/9b2679745f94c6bac875abb61e5093d462626a1f.1670287696.git.khalid.aziz%40oracle.com
patch subject: [RFC PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support
config: alpha-defconfig
compiler: alpha-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/cb94453c0289f4fd9a5a6a488950cf699162f4dc
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Khalid-Aziz/Add-support-for-sharing-page-tables-across-processes-Previously-mshare/20221206-234256
git checkout cb94453c0289f4fd9a5a6a488950cf699162f4dc
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
mm/ptshare.c: In function 'find_shared_vma':
>> mm/ptshare.c:126:17: error: implicit declaration of function 'set_pmd'; did you mean 'get_pmd'? [-Werror=implicit-function-declaration]
126 | set_pmd(guest_pmd, *host_pmd);
| ^~~~~~~
| get_pmd
cc1: some warnings being treated as errors
vim +126 mm/ptshare.c
96
97 /*
98 * Find the shared page tables in hosting mm struct and install those in
99 * the guest mm struct
100 */
101 vm_fault_t
102 find_shared_vma(struct vm_area_struct **vmap, unsigned long *addrp,
103 unsigned int flags)
104 {
105 struct mshare_data *info;
106 struct mm_struct *host_mm;
107 struct vm_area_struct *host_vma, *guest_vma = *vmap;
108 unsigned long host_addr;
109 pmd_t *guest_pmd, *host_pmd;
110
111 if ((!guest_vma->vm_file) || (!guest_vma->vm_file->f_mapping))
112 return 0;
113 info = guest_vma->vm_file->f_mapping->ptshare_data;
114 if (!info) {
115 pr_warn("VM_SHARED_PT vma with NULL ptshare_data");
116 dump_stack_print_info(KERN_WARNING);
117 return 0;
118 }
119 host_mm = info->mm;
120
121 mmap_read_lock(host_mm);
122 host_addr = *addrp - guest_vma->vm_start + host_mm->mmap_base;
123 host_pmd = get_pmd(host_mm, host_addr);
124 guest_pmd = get_pmd(guest_vma->vm_mm, *addrp);
125 if (!pmd_same(*guest_pmd, *host_pmd)) {
> 126 set_pmd(guest_pmd, *host_pmd);
127 mmap_read_unlock(host_mm);
128 return VM_FAULT_NOPAGE;
129 }
130
131 *addrp = host_addr;
132 host_vma = find_vma(host_mm, host_addr);
133 if (!host_vma)
134 return VM_FAULT_SIGSEGV;
135
136 /*
137 * Point vm_mm for the faulting vma to the mm struct holding shared
138 * page tables so the fault handling will happen in the right
139 * shared context
140 */
141 guest_vma->vm_mm = host_mm;
142
143 return 0;
144 }
145
--
0-DAY CI Kernel Test Service
https://01.org/lkp
[-- Attachment #2: config --]
[-- Type: text/plain, Size: 61410 bytes --]
#
# Automatically generated file; DO NOT EDIT.
# Linux/alpha 6.1.0-rc3 Kernel Configuration
#
CONFIG_CC_VERSION_TEXT="alpha-linux-gcc (GCC) 12.1.0"
CONFIG_CC_IS_GCC=y
CONFIG_GCC_VERSION=120100
CONFIG_CLANG_VERSION=0
CONFIG_AS_IS_GNU=y
CONFIG_AS_VERSION=23800
CONFIG_LD_IS_BFD=y
CONFIG_LD_VERSION=23800
CONFIG_LLD_VERSION=0
CONFIG_CC_HAS_ASM_INLINE=y
CONFIG_CC_HAS_NO_PROFILE_FN_ATTR=y
CONFIG_PAHOLE_VERSION=123
CONFIG_IRQ_WORK=y
#
# General setup
#
CONFIG_BROKEN_ON_SMP=y
CONFIG_INIT_ENV_ARG_LIMIT=32
# CONFIG_COMPILE_TEST is not set
# CONFIG_WERROR is not set
CONFIG_LOCALVERSION=""
CONFIG_LOCALVERSION_AUTO=y
CONFIG_BUILD_SALT=""
CONFIG_DEFAULT_INIT=""
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_POSIX_MQUEUE=y
CONFIG_POSIX_MQUEUE_SYSCTL=y
# CONFIG_WATCH_QUEUE is not set
CONFIG_CROSS_MEMORY_ATTACH=y
CONFIG_USELIB=y
# CONFIG_AUDIT is not set
CONFIG_HAVE_ARCH_AUDITSYSCALL=y
#
# IRQ subsystem
#
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_IRQ_SHOW=y
# end of IRQ subsystem
CONFIG_GENERIC_CLOCKEVENTS=y
#
# Timers subsystem
#
CONFIG_HZ_PERIODIC=y
# CONFIG_NO_HZ_IDLE is not set
# CONFIG_NO_HZ is not set
# CONFIG_HIGH_RES_TIMERS is not set
# end of Timers subsystem
CONFIG_BPF=y
#
# BPF subsystem
#
# CONFIG_BPF_SYSCALL is not set
# end of BPF subsystem
CONFIG_PREEMPT_NONE_BUILD=y
CONFIG_PREEMPT_NONE=y
#
# CPU/Task time and stats accounting
#
CONFIG_TICK_CPU_ACCOUNTING=y
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_TASKSTATS is not set
# CONFIG_PSI is not set
# end of CPU/Task time and stats accounting
#
# RCU Subsystem
#
CONFIG_TINY_RCU=y
# CONFIG_RCU_EXPERT is not set
CONFIG_SRCU=y
CONFIG_TINY_SRCU=y
# end of RCU Subsystem
# CONFIG_IKCONFIG is not set
# CONFIG_IKHEADERS is not set
CONFIG_LOG_BUF_SHIFT=14
CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=13
#
# Scheduler features
#
# end of Scheduler features
CONFIG_CC_HAS_INT128=y
CONFIG_CC_IMPLICIT_FALLTHROUGH="-Wimplicit-fallthrough=5"
CONFIG_GCC12_NO_ARRAY_BOUNDS=y
CONFIG_CC_NO_ARRAY_BOUNDS=y
# CONFIG_CGROUPS is not set
CONFIG_NAMESPACES=y
CONFIG_UTS_NS=y
CONFIG_IPC_NS=y
# CONFIG_USER_NS is not set
CONFIG_PID_NS=y
CONFIG_NET_NS=y
# CONFIG_CHECKPOINT_RESTORE is not set
# CONFIG_SCHED_AUTOGROUP is not set
# CONFIG_SYSFS_DEPRECATED is not set
# CONFIG_RELAY is not set
# CONFIG_BLK_DEV_INITRD is not set
# CONFIG_BOOT_CONFIG is not set
CONFIG_INITRAMFS_PRESERVE_MTIME=y
CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_SYSCTL=y
CONFIG_HAVE_PCSPKR_PLATFORM=y
# CONFIG_EXPERT is not set
CONFIG_MULTIUSER=y
CONFIG_SYSFS_SYSCALL=y
CONFIG_FHANDLE=y
CONFIG_POSIX_TIMERS=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_PCSPKR_PLATFORM=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_FUTEX_PI=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_AIO=y
CONFIG_IO_URING=y
CONFIG_ADVISE_SYSCALLS=y
CONFIG_MEMBARRIER=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_KALLSYMS_BASE_RELATIVE=y
# CONFIG_EMBEDDED is not set
CONFIG_HAVE_PERF_EVENTS=y
#
# Kernel Performance Events And Counters
#
# CONFIG_PERF_EVENTS is not set
# end of Kernel Performance Events And Counters
# CONFIG_PROFILING is not set
# end of General setup
CONFIG_ALPHA=y
CONFIG_64BIT=y
CONFIG_MMU=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_PGTABLE_LEVELS=3
CONFIG_AUDIT_ARCH=y
#
# System setup
#
CONFIG_ALPHA_GENERIC=y
# CONFIG_ALPHA_ALCOR is not set
# CONFIG_ALPHA_XL is not set
# CONFIG_ALPHA_BOOK1 is not set
# CONFIG_ALPHA_AVANTI_CH is not set
# CONFIG_ALPHA_CABRIOLET is not set
# CONFIG_ALPHA_DP264 is not set
# CONFIG_ALPHA_EB164 is not set
# CONFIG_ALPHA_EB64P_CH is not set
# CONFIG_ALPHA_EB66 is not set
# CONFIG_ALPHA_EB66P is not set
# CONFIG_ALPHA_EIGER is not set
# CONFIG_ALPHA_JENSEN is not set
# CONFIG_ALPHA_LX164 is not set
# CONFIG_ALPHA_LYNX is not set
# CONFIG_ALPHA_MARVEL is not set
# CONFIG_ALPHA_MIATA is not set
# CONFIG_ALPHA_MIKASA is not set
# CONFIG_ALPHA_NAUTILUS is not set
# CONFIG_ALPHA_NONAME_CH is not set
# CONFIG_ALPHA_NORITAKE is not set
# CONFIG_ALPHA_PC164 is not set
# CONFIG_ALPHA_P2K is not set
# CONFIG_ALPHA_RAWHIDE is not set
# CONFIG_ALPHA_RUFFIAN is not set
# CONFIG_ALPHA_RX164 is not set
# CONFIG_ALPHA_SX164 is not set
# CONFIG_ALPHA_SABLE is not set
# CONFIG_ALPHA_SHARK is not set
# CONFIG_ALPHA_TAKARA is not set
# CONFIG_ALPHA_TITAN is not set
# CONFIG_ALPHA_WILDFIRE is not set
CONFIG_ISA=y
CONFIG_ISA_DMA_API=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ALPHA_BROKEN_IRQ_MASK=y
CONFIG_VGA_HOSE=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
# CONFIG_SMP is not set
# CONFIG_ARCH_SPARSEMEM_ENABLE is not set
# CONFIG_ALPHA_WTINT is not set
CONFIG_VERBOSE_MCHECK=y
CONFIG_VERBOSE_MCHECK_ON=1
# CONFIG_HZ_32 is not set
# CONFIG_HZ_64 is not set
# CONFIG_HZ_128 is not set
# CONFIG_HZ_256 is not set
CONFIG_HZ_1024=y
# CONFIG_HZ_1200 is not set
CONFIG_HZ=1024
CONFIG_SRM_ENV=m
# end of System setup
CONFIG_DUMMY_CONSOLE=y
#
# General architecture-dependent options
#
CONFIG_CRASH_CORE=y
CONFIG_HAVE_64BIT_ALIGNED_ACCESS=y
CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_ARCH_32BIT_USTAT_F_TINODE=y
CONFIG_HAVE_ASM_MODVERSIONS=y
CONFIG_MMU_GATHER_NO_RANGE=y
CONFIG_MMU_GATHER_MERGE_VMAS=y
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
CONFIG_LTO_NONE=y
CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
CONFIG_MODULES_USE_ELF_RELA=y
CONFIG_PAGE_SIZE_LESS_THAN_64KB=y
CONFIG_PAGE_SIZE_LESS_THAN_256KB=y
CONFIG_ISA_BUS_API=y
CONFIG_ODD_RT_SIGACTION=y
CONFIG_OLD_SIGSUSPEND=y
# CONFIG_COMPAT_32BIT_TIME is not set
CONFIG_ARCH_NO_PREEMPT=y
CONFIG_CPU_NO_EFFICIENT_FFS=y
#
# GCOV-based kernel profiling
#
# end of GCOV-based kernel profiling
# end of General architecture-dependent options
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
CONFIG_MODULES=y
# CONFIG_MODULE_FORCE_LOAD is not set
CONFIG_MODULE_UNLOAD=y
# CONFIG_MODULE_FORCE_UNLOAD is not set
# CONFIG_MODULE_UNLOAD_TAINT_TRACKING is not set
# CONFIG_MODVERSIONS is not set
# CONFIG_MODULE_SRCVERSION_ALL is not set
# CONFIG_MODULE_SIG is not set
CONFIG_MODULE_COMPRESS_NONE=y
# CONFIG_MODULE_COMPRESS_GZIP is not set
# CONFIG_MODULE_COMPRESS_XZ is not set
# CONFIG_MODULE_COMPRESS_ZSTD is not set
# CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS is not set
CONFIG_MODPROBE_PATH="/sbin/modprobe"
CONFIG_BLOCK=y
CONFIG_BLOCK_LEGACY_AUTOLOAD=y
CONFIG_BLK_DEV_BSG_COMMON=y
# CONFIG_BLK_DEV_BSGLIB is not set
# CONFIG_BLK_DEV_INTEGRITY is not set
# CONFIG_BLK_DEV_ZONED is not set
# CONFIG_BLK_WBT is not set
# CONFIG_BLK_SED_OPAL is not set
# CONFIG_BLK_INLINE_ENCRYPTION is not set
#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_OSF_PARTITION=y
CONFIG_MSDOS_PARTITION=y
CONFIG_EFI_PARTITION=y
# end of Partition Types
CONFIG_BLK_MQ_PCI=y
#
# IO Schedulers
#
CONFIG_MQ_IOSCHED_DEADLINE=y
CONFIG_MQ_IOSCHED_KYBER=y
# CONFIG_IOSCHED_BFQ is not set
# end of IO Schedulers
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y
CONFIG_INLINE_WRITE_UNLOCK=y
CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
#
# Executable file formats
#
CONFIG_BINFMT_ELF=y
CONFIG_ELFCORE=y
CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y
CONFIG_BINFMT_SCRIPT=y
# CONFIG_BINFMT_MISC is not set
CONFIG_COREDUMP=y
# end of Executable file formats
#
# Memory Management options
#
CONFIG_SWAP=y
# CONFIG_ZSWAP is not set
#
# SLAB allocator options
#
# CONFIG_SLAB is not set
CONFIG_SLUB=y
CONFIG_SLAB_MERGE_DEFAULT=y
# CONFIG_SLAB_FREELIST_RANDOM is not set
# CONFIG_SLAB_FREELIST_HARDENED is not set
# CONFIG_SLUB_STATS is not set
# end of SLAB allocator options
# CONFIG_SHUFFLE_PAGE_ALLOCATOR is not set
CONFIG_COMPAT_BRK=y
CONFIG_FLATMEM=y
CONFIG_SPLIT_PTLOCK_CPUS=4
CONFIG_COMPACTION=y
CONFIG_COMPACT_UNEVICTABLE_DEFAULT=1
# CONFIG_PAGE_REPORTING is not set
CONFIG_MIGRATION=y
CONFIG_PHYS_ADDR_T_64BIT=y
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_NEED_PER_CPU_KM=y
# CONFIG_CMA is not set
# CONFIG_IDLE_PAGE_TRACKING is not set
CONFIG_ZONE_DMA=y
CONFIG_VM_EVENT_COUNTERS=y
# CONFIG_PERCPU_STATS is not set
#
# GUP_TEST needs to have DEBUG_FS enabled
#
# CONFIG_ANON_VMA_NAME is not set
# CONFIG_USERFAULTFD is not set
# CONFIG_LRU_GEN is not set
#
# Data Access Monitoring
#
# CONFIG_DAMON is not set
# end of Data Access Monitoring
# end of Memory Management options
CONFIG_NET=y
CONFIG_NET_INGRESS=y
CONFIG_NET_EGRESS=y
CONFIG_SKB_EXTENSIONS=y
#
# Networking options
#
CONFIG_PACKET=y
# CONFIG_PACKET_DIAG is not set
CONFIG_UNIX=y
CONFIG_UNIX_SCM=y
CONFIG_AF_UNIX_OOB=y
# CONFIG_UNIX_DIAG is not set
# CONFIG_TLS is not set
CONFIG_XFRM=y
CONFIG_XFRM_ALGO=m
CONFIG_XFRM_USER=m
# CONFIG_XFRM_SUB_POLICY is not set
# CONFIG_XFRM_MIGRATE is not set
# CONFIG_XFRM_STATISTICS is not set
CONFIG_XFRM_AH=m
CONFIG_XFRM_ESP=m
CONFIG_NET_KEY=m
# CONFIG_NET_KEY_MIGRATE is not set
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
# CONFIG_IP_ADVANCED_ROUTER is not set
# CONFIG_IP_PNP is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE_DEMUX is not set
# CONFIG_IP_MROUTE is not set
# CONFIG_SYN_COOKIES is not set
# CONFIG_NET_IPVTI is not set
# CONFIG_NET_FOU is not set
CONFIG_INET_AH=m
CONFIG_INET_ESP=m
# CONFIG_INET_ESP_OFFLOAD is not set
# CONFIG_INET_ESPINTCP is not set
# CONFIG_INET_IPCOMP is not set
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
# CONFIG_INET_UDP_DIAG is not set
# CONFIG_INET_RAW_DIAG is not set
# CONFIG_INET_DIAG_DESTROY is not set
# CONFIG_TCP_CONG_ADVANCED is not set
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
# CONFIG_TCP_MD5SIG is not set
# CONFIG_IPV6 is not set
# CONFIG_MPTCP is not set
# CONFIG_NETWORK_SECMARK is not set
CONFIG_NET_PTP_CLASSIFY=y
# CONFIG_NETWORK_PHY_TIMESTAMPING is not set
CONFIG_NETFILTER=y
CONFIG_NETFILTER_ADVANCED=y
#
# Core Netfilter Configuration
#
CONFIG_NETFILTER_INGRESS=y
CONFIG_NETFILTER_EGRESS=y
# CONFIG_NETFILTER_NETLINK_ACCT is not set
# CONFIG_NETFILTER_NETLINK_QUEUE is not set
# CONFIG_NETFILTER_NETLINK_LOG is not set
# CONFIG_NETFILTER_NETLINK_OSF is not set
# CONFIG_NF_CONNTRACK is not set
# CONFIG_NF_LOG_SYSLOG is not set
# CONFIG_NF_TABLES is not set
CONFIG_NETFILTER_XTABLES=m
#
# Xtables combined modules
#
# CONFIG_NETFILTER_XT_MARK is not set
#
# Xtables targets
#
# CONFIG_NETFILTER_XT_TARGET_CLASSIFY is not set
# CONFIG_NETFILTER_XT_TARGET_HMARK is not set
# CONFIG_NETFILTER_XT_TARGET_IDLETIMER is not set
# CONFIG_NETFILTER_XT_TARGET_LOG is not set
# CONFIG_NETFILTER_XT_TARGET_MARK is not set
# CONFIG_NETFILTER_XT_TARGET_NFLOG is not set
# CONFIG_NETFILTER_XT_TARGET_NFQUEUE is not set
# CONFIG_NETFILTER_XT_TARGET_RATEEST is not set
# CONFIG_NETFILTER_XT_TARGET_TEE is not set
# CONFIG_NETFILTER_XT_TARGET_TCPMSS is not set
#
# Xtables matches
#
# CONFIG_NETFILTER_XT_MATCH_ADDRTYPE is not set
# CONFIG_NETFILTER_XT_MATCH_BPF is not set
# CONFIG_NETFILTER_XT_MATCH_COMMENT is not set
# CONFIG_NETFILTER_XT_MATCH_CPU is not set
# CONFIG_NETFILTER_XT_MATCH_DCCP is not set
# CONFIG_NETFILTER_XT_MATCH_DEVGROUP is not set
# CONFIG_NETFILTER_XT_MATCH_DSCP is not set
# CONFIG_NETFILTER_XT_MATCH_ECN is not set
# CONFIG_NETFILTER_XT_MATCH_ESP is not set
# CONFIG_NETFILTER_XT_MATCH_HASHLIMIT is not set
# CONFIG_NETFILTER_XT_MATCH_HL is not set
# CONFIG_NETFILTER_XT_MATCH_IPCOMP is not set
# CONFIG_NETFILTER_XT_MATCH_IPRANGE is not set
# CONFIG_NETFILTER_XT_MATCH_L2TP is not set
# CONFIG_NETFILTER_XT_MATCH_LENGTH is not set
# CONFIG_NETFILTER_XT_MATCH_LIMIT is not set
# CONFIG_NETFILTER_XT_MATCH_MAC is not set
# CONFIG_NETFILTER_XT_MATCH_MARK is not set
# CONFIG_NETFILTER_XT_MATCH_MULTIPORT is not set
# CONFIG_NETFILTER_XT_MATCH_NFACCT is not set
# CONFIG_NETFILTER_XT_MATCH_OSF is not set
# CONFIG_NETFILTER_XT_MATCH_OWNER is not set
# CONFIG_NETFILTER_XT_MATCH_POLICY is not set
# CONFIG_NETFILTER_XT_MATCH_PKTTYPE is not set
# CONFIG_NETFILTER_XT_MATCH_QUOTA is not set
# CONFIG_NETFILTER_XT_MATCH_RATEEST is not set
# CONFIG_NETFILTER_XT_MATCH_REALM is not set
# CONFIG_NETFILTER_XT_MATCH_RECENT is not set
# CONFIG_NETFILTER_XT_MATCH_SCTP is not set
# CONFIG_NETFILTER_XT_MATCH_SOCKET is not set
# CONFIG_NETFILTER_XT_MATCH_STATISTIC is not set
# CONFIG_NETFILTER_XT_MATCH_STRING is not set
# CONFIG_NETFILTER_XT_MATCH_TCPMSS is not set
# CONFIG_NETFILTER_XT_MATCH_TIME is not set
# CONFIG_NETFILTER_XT_MATCH_U32 is not set
# end of Core Netfilter Configuration
# CONFIG_IP_SET is not set
# CONFIG_IP_VS is not set
#
# IP: Netfilter Configuration
#
# CONFIG_NF_SOCKET_IPV4 is not set
# CONFIG_NF_TPROXY_IPV4 is not set
# CONFIG_NF_DUP_IPV4 is not set
# CONFIG_NF_LOG_ARP is not set
# CONFIG_NF_LOG_IPV4 is not set
# CONFIG_NF_REJECT_IPV4 is not set
CONFIG_IP_NF_IPTABLES=m
# CONFIG_IP_NF_MATCH_AH is not set
# CONFIG_IP_NF_MATCH_ECN is not set
# CONFIG_IP_NF_MATCH_TTL is not set
CONFIG_IP_NF_FILTER=m
# CONFIG_IP_NF_TARGET_REJECT is not set
# CONFIG_IP_NF_MANGLE is not set
# CONFIG_IP_NF_RAW is not set
# CONFIG_IP_NF_ARPTABLES is not set
# end of IP: Netfilter Configuration
# CONFIG_BPFILTER is not set
# CONFIG_IP_DCCP is not set
# CONFIG_IP_SCTP is not set
# CONFIG_RDS is not set
# CONFIG_TIPC is not set
# CONFIG_ATM is not set
# CONFIG_L2TP is not set
# CONFIG_BRIDGE is not set
# CONFIG_NET_DSA is not set
CONFIG_VLAN_8021Q=m
# CONFIG_VLAN_8021Q_GVRP is not set
# CONFIG_VLAN_8021Q_MVRP is not set
# CONFIG_LLC2 is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_PHONET is not set
# CONFIG_IEEE802154 is not set
# CONFIG_NET_SCHED is not set
# CONFIG_DCB is not set
# CONFIG_BATMAN_ADV is not set
# CONFIG_OPENVSWITCH is not set
# CONFIG_VSOCKETS is not set
# CONFIG_NETLINK_DIAG is not set
# CONFIG_MPLS is not set
# CONFIG_NET_NSH is not set
# CONFIG_HSR is not set
# CONFIG_NET_SWITCHDEV is not set
# CONFIG_NET_L3_MASTER_DEV is not set
# CONFIG_QRTR is not set
# CONFIG_NET_NCSI is not set
CONFIG_NET_RX_BUSY_POLL=y
CONFIG_BQL=y
#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
# end of Network testing
# end of Networking options
# CONFIG_HAMRADIO is not set
# CONFIG_CAN is not set
# CONFIG_BT is not set
# CONFIG_AF_RXRPC is not set
# CONFIG_AF_KCM is not set
# CONFIG_MCTP is not set
CONFIG_WIRELESS=y
# CONFIG_CFG80211 is not set
#
# CFG80211 needs to be enabled for MAC80211
#
CONFIG_MAC80211_STA_HASH_MAX_SIZE=0
# CONFIG_RFKILL is not set
# CONFIG_NET_9P is not set
# CONFIG_CAIF is not set
# CONFIG_CEPH_LIB is not set
# CONFIG_NFC is not set
# CONFIG_PSAMPLE is not set
# CONFIG_NET_IFE is not set
# CONFIG_LWTUNNEL is not set
CONFIG_GRO_CELLS=y
# CONFIG_FAILOVER is not set
CONFIG_ETHTOOL_NETLINK=y
#
# Device Drivers
#
CONFIG_HAVE_EISA=y
# CONFIG_EISA is not set
CONFIG_HAVE_PCI=y
CONFIG_FORCE_PCI=y
CONFIG_PCI=y
CONFIG_PCI_DOMAINS=y
CONFIG_PCI_SYSCALL=y
# CONFIG_PCIEPORTBUS is not set
CONFIG_PCIEASPM=y
CONFIG_PCIEASPM_DEFAULT=y
# CONFIG_PCIEASPM_POWERSAVE is not set
# CONFIG_PCIEASPM_POWER_SUPERSAVE is not set
# CONFIG_PCIEASPM_PERFORMANCE is not set
# CONFIG_PCIE_PTM is not set
# CONFIG_PCI_MSI is not set
CONFIG_PCI_QUIRKS=y
# CONFIG_PCI_DEBUG is not set
# CONFIG_PCI_STUB is not set
# CONFIG_PCI_IOV is not set
# CONFIG_PCI_PRI is not set
# CONFIG_PCI_PASID is not set
CONFIG_VGA_ARB=y
CONFIG_VGA_ARB_MAX_GPUS=16
# CONFIG_HOTPLUG_PCI is not set
#
# PCI controller drivers
#
#
# DesignWare PCI Core Support
#
# end of DesignWare PCI Core Support
#
# Mobiveil PCIe Core Support
#
# end of Mobiveil PCIe Core Support
#
# Cadence PCIe controllers support
#
# end of Cadence PCIe controllers support
# end of PCI controller drivers
#
# PCI Endpoint
#
# CONFIG_PCI_ENDPOINT is not set
# end of PCI Endpoint
#
# PCI switch controller drivers
#
# CONFIG_PCI_SW_SWITCHTEC is not set
# end of PCI switch controller drivers
# CONFIG_CXL_BUS is not set
# CONFIG_PCCARD is not set
# CONFIG_RAPIDIO is not set
#
# Generic Driver Options
#
# CONFIG_UEVENT_HELPER is not set
CONFIG_DEVTMPFS=y
# CONFIG_DEVTMPFS_MOUNT is not set
# CONFIG_DEVTMPFS_SAFE is not set
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
#
# Firmware loader
#
CONFIG_FW_LOADER=y
CONFIG_EXTRA_FIRMWARE=""
# CONFIG_FW_LOADER_USER_HELPER is not set
# CONFIG_FW_LOADER_COMPRESS is not set
# CONFIG_FW_UPLOAD is not set
# end of Firmware loader
CONFIG_ALLOW_DEV_COREDUMP=y
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_DEBUG_TEST_DRIVER_REMOVE is not set
# CONFIG_TEST_ASYNC_DRIVER_PROBE is not set
CONFIG_GENERIC_CPU_VULNERABILITIES=y
# end of Generic Driver Options
#
# Bus devices
#
# CONFIG_MHI_BUS is not set
# CONFIG_MHI_BUS_EP is not set
# end of Bus devices
# CONFIG_CONNECTOR is not set
#
# Firmware Drivers
#
#
# ARM System Control and Management Interface Protocol
#
# end of ARM System Control and Management Interface Protocol
# CONFIG_GOOGLE_FIRMWARE is not set
#
# Tegra firmware driver
#
# end of Tegra firmware driver
# end of Firmware Drivers
# CONFIG_GNSS is not set
# CONFIG_MTD is not set
# CONFIG_OF is not set
CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
# CONFIG_PARPORT is not set
CONFIG_PNP=y
CONFIG_PNP_DEBUG_MESSAGES=y
#
# Protocols
#
CONFIG_ISAPNP=y
CONFIG_BLK_DEV=y
# CONFIG_BLK_DEV_NULL_BLK is not set
CONFIG_BLK_DEV_FD=y
# CONFIG_BLK_DEV_FD_RAWCMD is not set
CONFIG_CDROM=y
# CONFIG_BLK_DEV_PCIESSD_MTIP32XX is not set
CONFIG_BLK_DEV_LOOP=m
CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
# CONFIG_BLK_DEV_DRBD is not set
# CONFIG_BLK_DEV_NBD is not set
# CONFIG_BLK_DEV_RAM is not set
# CONFIG_CDROM_PKTCDVD is not set
# CONFIG_ATA_OVER_ETH is not set
# CONFIG_BLK_DEV_RBD is not set
# CONFIG_BLK_DEV_UBLK is not set
#
# NVME Support
#
# CONFIG_BLK_DEV_NVME is not set
# CONFIG_NVME_FC is not set
# CONFIG_NVME_TCP is not set
# end of NVME Support
#
# Misc devices
#
# CONFIG_DUMMY_IRQ is not set
# CONFIG_PHANTOM is not set
# CONFIG_TIFM_CORE is not set
# CONFIG_ENCLOSURE_SERVICES is not set
# CONFIG_HP_ILO is not set
# CONFIG_SRAM is not set
# CONFIG_DW_XDATA_PCIE is not set
# CONFIG_PCI_ENDPOINT_TEST is not set
# CONFIG_XILINX_SDFEC is not set
# CONFIG_C2PORT is not set
#
# EEPROM support
#
# CONFIG_EEPROM_93CX6 is not set
# end of EEPROM support
# CONFIG_CB710_CORE is not set
#
# Texas Instruments shared transport line discipline
#
# end of Texas Instruments shared transport line discipline
#
# Altera FPGA firmware download module (requires I2C)
#
# CONFIG_GENWQE is not set
# CONFIG_ECHO is not set
# CONFIG_MISC_ALCOR_PCI is not set
# CONFIG_MISC_RTSX_PCI is not set
# CONFIG_HABANA_AI is not set
# CONFIG_PVPANIC is not set
# end of Misc devices
#
# SCSI device support
#
CONFIG_SCSI_MOD=y
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI_COMMON=y
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
CONFIG_SCSI_PROC_FS=y
#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
CONFIG_BLK_DEV_SR=y
# CONFIG_CHR_DEV_SG is not set
CONFIG_BLK_DEV_BSG=y
# CONFIG_CHR_DEV_SCH is not set
# CONFIG_SCSI_CONSTANTS is not set
# CONFIG_SCSI_LOGGING is not set
# CONFIG_SCSI_SCAN_ASYNC is not set
#
# SCSI Transports
#
CONFIG_SCSI_SPI_ATTRS=m
# CONFIG_SCSI_FC_ATTRS is not set
# CONFIG_SCSI_ISCSI_ATTRS is not set
# CONFIG_SCSI_SAS_ATTRS is not set
# CONFIG_SCSI_SAS_LIBSAS is not set
# CONFIG_SCSI_SRP_ATTRS is not set
# end of SCSI Transports
CONFIG_SCSI_LOWLEVEL=y
# CONFIG_ISCSI_TCP is not set
# CONFIG_ISCSI_BOOT_SYSFS is not set
# CONFIG_SCSI_CXGB3_ISCSI is not set
# CONFIG_SCSI_CXGB4_ISCSI is not set
# CONFIG_SCSI_BNX2_ISCSI is not set
# CONFIG_BE2ISCSI is not set
# CONFIG_BLK_DEV_3W_XXXX_RAID is not set
# CONFIG_SCSI_HPSA is not set
# CONFIG_SCSI_3W_9XXX is not set
# CONFIG_SCSI_3W_SAS is not set
# CONFIG_SCSI_ACARD is not set
# CONFIG_SCSI_AHA152X is not set
# CONFIG_SCSI_AHA1542 is not set
# CONFIG_SCSI_AACRAID is not set
CONFIG_SCSI_AIC7XXX=m
CONFIG_AIC7XXX_CMDS_PER_DEVICE=253
CONFIG_AIC7XXX_RESET_DELAY_MS=5000
# CONFIG_AIC7XXX_DEBUG_ENABLE is not set
CONFIG_AIC7XXX_DEBUG_MASK=0
CONFIG_AIC7XXX_REG_PRETTY_PRINT=y
# CONFIG_SCSI_AIC79XX is not set
# CONFIG_SCSI_AIC94XX is not set
# CONFIG_SCSI_MVSAS is not set
# CONFIG_SCSI_MVUMI is not set
# CONFIG_SCSI_ADVANSYS is not set
# CONFIG_SCSI_ARCMSR is not set
# CONFIG_SCSI_ESAS2R is not set
# CONFIG_MEGARAID_NEWGEN is not set
# CONFIG_MEGARAID_LEGACY is not set
# CONFIG_MEGARAID_SAS is not set
# CONFIG_SCSI_MPT3SAS is not set
# CONFIG_SCSI_MPT2SAS is not set
# CONFIG_SCSI_MPI3MR is not set
# CONFIG_SCSI_SMARTPQI is not set
# CONFIG_SCSI_HPTIOP is not set
# CONFIG_SCSI_BUSLOGIC is not set
# CONFIG_SCSI_MYRB is not set
# CONFIG_SCSI_MYRS is not set
# CONFIG_SCSI_SNIC is not set
# CONFIG_SCSI_DMX3191D is not set
# CONFIG_SCSI_FDOMAIN_PCI is not set
# CONFIG_SCSI_FDOMAIN_ISA is not set
# CONFIG_SCSI_GENERIC_NCR5380 is not set
# CONFIG_SCSI_IPS is not set
# CONFIG_SCSI_INITIO is not set
# CONFIG_SCSI_INIA100 is not set
# CONFIG_SCSI_STEX is not set
# CONFIG_SCSI_SYM53C8XX_2 is not set
# CONFIG_SCSI_IPR is not set
# CONFIG_SCSI_QLOGIC_FAS is not set
# CONFIG_SCSI_QLOGIC_1280 is not set
# CONFIG_SCSI_QLA_ISCSI is not set
# CONFIG_SCSI_DC395x is not set
# CONFIG_SCSI_AM53C974 is not set
# CONFIG_SCSI_WD719X is not set
# CONFIG_SCSI_DEBUG is not set
# CONFIG_SCSI_PMCRAID is not set
# CONFIG_SCSI_PM8001 is not set
# CONFIG_SCSI_DH is not set
# end of SCSI device support
CONFIG_ATA=y
CONFIG_SATA_HOST=y
CONFIG_PATA_TIMINGS=y
CONFIG_ATA_VERBOSE_ERROR=y
CONFIG_ATA_FORCE=y
# CONFIG_SATA_PMP is not set
#
# Controllers with non-SFF native interface
#
# CONFIG_SATA_AHCI is not set
# CONFIG_SATA_AHCI_PLATFORM is not set
# CONFIG_AHCI_DWC is not set
# CONFIG_SATA_INIC162X is not set
# CONFIG_SATA_ACARD_AHCI is not set
# CONFIG_SATA_SIL24 is not set
CONFIG_ATA_SFF=y
#
# SFF controllers with custom DMA interface
#
# CONFIG_PDC_ADMA is not set
# CONFIG_SATA_QSTOR is not set
# CONFIG_SATA_SX4 is not set
CONFIG_ATA_BMDMA=y
#
# SATA SFF controllers with BMDMA
#
# CONFIG_ATA_PIIX is not set
# CONFIG_SATA_MV is not set
# CONFIG_SATA_NV is not set
# CONFIG_SATA_PROMISE is not set
# CONFIG_SATA_SIL is not set
# CONFIG_SATA_SIS is not set
# CONFIG_SATA_SVW is not set
# CONFIG_SATA_ULI is not set
# CONFIG_SATA_VIA is not set
# CONFIG_SATA_VITESSE is not set
#
# PATA SFF controllers with BMDMA
#
CONFIG_PATA_ALI=y
# CONFIG_PATA_AMD is not set
# CONFIG_PATA_ARTOP is not set
# CONFIG_PATA_ATIIXP is not set
# CONFIG_PATA_ATP867X is not set
CONFIG_PATA_CMD64X=y
CONFIG_PATA_CYPRESS=y
# CONFIG_PATA_EFAR is not set
# CONFIG_PATA_HPT366 is not set
# CONFIG_PATA_HPT37X is not set
# CONFIG_PATA_HPT3X2N is not set
# CONFIG_PATA_HPT3X3 is not set
# CONFIG_PATA_IT8213 is not set
# CONFIG_PATA_IT821X is not set
# CONFIG_PATA_JMICRON is not set
# CONFIG_PATA_MARVELL is not set
# CONFIG_PATA_NETCELL is not set
# CONFIG_PATA_NINJA32 is not set
# CONFIG_PATA_NS87415 is not set
# CONFIG_PATA_OLDPIIX is not set
# CONFIG_PATA_OPTIDMA is not set
# CONFIG_PATA_PDC2027X is not set
# CONFIG_PATA_PDC_OLD is not set
# CONFIG_PATA_RADISYS is not set
# CONFIG_PATA_RDC is not set
# CONFIG_PATA_SCH is not set
# CONFIG_PATA_SERVERWORKS is not set
# CONFIG_PATA_SIL680 is not set
# CONFIG_PATA_SIS is not set
# CONFIG_PATA_TOSHIBA is not set
# CONFIG_PATA_TRIFLEX is not set
# CONFIG_PATA_VIA is not set
# CONFIG_PATA_WINBOND is not set
#
# PIO-only SFF controllers
#
# CONFIG_PATA_CMD640_PCI is not set
# CONFIG_PATA_ISAPNP is not set
# CONFIG_PATA_MPIIX is not set
# CONFIG_PATA_NS87410 is not set
# CONFIG_PATA_OPTI is not set
# CONFIG_PATA_QDI is not set
# CONFIG_PATA_RZ1000 is not set
# CONFIG_PATA_WINBOND_VLB is not set
#
# Generic fallback / legacy drivers
#
CONFIG_ATA_GENERIC=y
# CONFIG_PATA_LEGACY is not set
# CONFIG_MD is not set
# CONFIG_TARGET_CORE is not set
# CONFIG_FUSION is not set
#
# IEEE 1394 (FireWire) support
#
# CONFIG_FIREWIRE is not set
# CONFIG_FIREWIRE_NOSY is not set
# end of IEEE 1394 (FireWire) support
CONFIG_NETDEVICES=y
CONFIG_MII=y
CONFIG_NET_CORE=y
# CONFIG_BONDING is not set
CONFIG_DUMMY=m
# CONFIG_WIREGUARD is not set
# CONFIG_EQUALIZER is not set
# CONFIG_NET_FC is not set
# CONFIG_NET_TEAM is not set
# CONFIG_MACVLAN is not set
# CONFIG_IPVLAN is not set
# CONFIG_VXLAN is not set
# CONFIG_GENEVE is not set
# CONFIG_BAREUDP is not set
# CONFIG_GTP is not set
# CONFIG_AMT is not set
# CONFIG_MACSEC is not set
# CONFIG_NETCONSOLE is not set
# CONFIG_TUN is not set
# CONFIG_TUN_VNET_CROSS_LE is not set
# CONFIG_VETH is not set
# CONFIG_NLMON is not set
# CONFIG_ARCNET is not set
CONFIG_ETHERNET=y
CONFIG_NET_VENDOR_3COM=y
# CONFIG_EL3 is not set
# CONFIG_3C515 is not set
CONFIG_VORTEX=y
# CONFIG_TYPHOON is not set
CONFIG_NET_VENDOR_ADAPTEC=y
# CONFIG_ADAPTEC_STARFIRE is not set
CONFIG_NET_VENDOR_AGERE=y
# CONFIG_ET131X is not set
CONFIG_NET_VENDOR_ALACRITECH=y
# CONFIG_SLICOSS is not set
CONFIG_NET_VENDOR_ALTEON=y
# CONFIG_ACENIC is not set
# CONFIG_ALTERA_TSE is not set
CONFIG_NET_VENDOR_AMAZON=y
CONFIG_NET_VENDOR_AMD=y
# CONFIG_AMD8111_ETH is not set
# CONFIG_LANCE is not set
# CONFIG_PCNET32 is not set
CONFIG_NET_VENDOR_AQUANTIA=y
# CONFIG_AQTION is not set
CONFIG_NET_VENDOR_ARC=y
CONFIG_NET_VENDOR_ASIX=y
CONFIG_NET_VENDOR_ATHEROS=y
# CONFIG_ATL2 is not set
# CONFIG_ATL1 is not set
# CONFIG_ATL1E is not set
# CONFIG_ATL1C is not set
# CONFIG_ALX is not set
CONFIG_NET_VENDOR_BROADCOM=y
# CONFIG_B44 is not set
# CONFIG_BCMGENET is not set
# CONFIG_BNX2 is not set
# CONFIG_CNIC is not set
# CONFIG_TIGON3 is not set
# CONFIG_BNX2X is not set
# CONFIG_SYSTEMPORT is not set
# CONFIG_BNXT is not set
CONFIG_NET_VENDOR_CADENCE=y
CONFIG_NET_VENDOR_CAVIUM=y
# CONFIG_THUNDER_NIC_PF is not set
# CONFIG_THUNDER_NIC_VF is not set
# CONFIG_THUNDER_NIC_BGX is not set
# CONFIG_THUNDER_NIC_RGX is not set
# CONFIG_CAVIUM_PTP is not set
# CONFIG_LIQUIDIO is not set
CONFIG_NET_VENDOR_CHELSIO=y
# CONFIG_CHELSIO_T1 is not set
# CONFIG_CHELSIO_T3 is not set
# CONFIG_CHELSIO_T4 is not set
# CONFIG_CHELSIO_T4VF is not set
CONFIG_NET_VENDOR_CIRRUS=y
# CONFIG_CS89x0_ISA is not set
CONFIG_NET_VENDOR_CISCO=y
# CONFIG_ENIC is not set
CONFIG_NET_VENDOR_CORTINA=y
CONFIG_NET_VENDOR_DAVICOM=y
# CONFIG_DNET is not set
CONFIG_NET_VENDOR_DEC=y
CONFIG_NET_TULIP=y
CONFIG_DE2104X=m
CONFIG_DE2104X_DSL=0
CONFIG_TULIP=y
# CONFIG_TULIP_MWI is not set
CONFIG_TULIP_MMIO=y
# CONFIG_TULIP_NAPI is not set
# CONFIG_WINBOND_840 is not set
# CONFIG_DM9102 is not set
# CONFIG_ULI526X is not set
CONFIG_NET_VENDOR_DLINK=y
# CONFIG_DL2K is not set
# CONFIG_SUNDANCE is not set
CONFIG_NET_VENDOR_EMULEX=y
# CONFIG_BE2NET is not set
CONFIG_NET_VENDOR_ENGLEDER=y
# CONFIG_TSNEP is not set
CONFIG_NET_VENDOR_EZCHIP=y
CONFIG_NET_VENDOR_FUNGIBLE=y
CONFIG_NET_VENDOR_GOOGLE=y
CONFIG_NET_VENDOR_HUAWEI=y
CONFIG_NET_VENDOR_I825XX=y
CONFIG_NET_VENDOR_INTEL=y
# CONFIG_E100 is not set
# CONFIG_E1000 is not set
# CONFIG_E1000E is not set
# CONFIG_IGB is not set
# CONFIG_IGBVF is not set
# CONFIG_IXGB is not set
# CONFIG_IXGBE is not set
# CONFIG_I40E is not set
# CONFIG_IGC is not set
CONFIG_NET_VENDOR_WANGXUN=y
# CONFIG_NGBE is not set
# CONFIG_TXGBE is not set
# CONFIG_JME is not set
CONFIG_NET_VENDOR_LITEX=y
CONFIG_NET_VENDOR_MARVELL=y
# CONFIG_MVMDIO is not set
# CONFIG_SKGE is not set
# CONFIG_SKY2 is not set
# CONFIG_OCTEON_EP is not set
CONFIG_NET_VENDOR_MELLANOX=y
# CONFIG_MLX4_EN is not set
# CONFIG_MLX5_CORE is not set
# CONFIG_MLXSW_CORE is not set
# CONFIG_MLXFW is not set
CONFIG_NET_VENDOR_MICREL=y
# CONFIG_KS8851_MLL is not set
# CONFIG_KSZ884X_PCI is not set
CONFIG_NET_VENDOR_MICROCHIP=y
# CONFIG_LAN743X is not set
CONFIG_NET_VENDOR_MICROSEMI=y
CONFIG_NET_VENDOR_MICROSOFT=y
CONFIG_NET_VENDOR_MYRI=y
# CONFIG_MYRI10GE is not set
# CONFIG_FEALNX is not set
CONFIG_NET_VENDOR_NI=y
# CONFIG_NI_XGE_MANAGEMENT_ENET is not set
CONFIG_NET_VENDOR_NATSEMI=y
# CONFIG_NATSEMI is not set
# CONFIG_NS83820 is not set
CONFIG_NET_VENDOR_NETERION=y
# CONFIG_S2IO is not set
CONFIG_NET_VENDOR_NETRONOME=y
CONFIG_NET_VENDOR_8390=y
# CONFIG_NE2000 is not set
# CONFIG_NE2K_PCI is not set
# CONFIG_ULTRA is not set
# CONFIG_WD80x3 is not set
CONFIG_NET_VENDOR_NVIDIA=y
# CONFIG_FORCEDETH is not set
CONFIG_NET_VENDOR_OKI=y
# CONFIG_ETHOC is not set
CONFIG_NET_VENDOR_PACKET_ENGINES=y
# CONFIG_HAMACHI is not set
CONFIG_YELLOWFIN=y
CONFIG_NET_VENDOR_PENSANDO=y
# CONFIG_IONIC is not set
CONFIG_NET_VENDOR_QLOGIC=y
# CONFIG_QLA3XXX is not set
# CONFIG_QLCNIC is not set
# CONFIG_NETXEN_NIC is not set
# CONFIG_QED is not set
CONFIG_NET_VENDOR_BROCADE=y
# CONFIG_BNA is not set
CONFIG_NET_VENDOR_QUALCOMM=y
# CONFIG_QCOM_EMAC is not set
# CONFIG_RMNET is not set
CONFIG_NET_VENDOR_RDC=y
# CONFIG_R6040 is not set
CONFIG_NET_VENDOR_REALTEK=y
# CONFIG_8139CP is not set
# CONFIG_8139TOO is not set
# CONFIG_R8169 is not set
CONFIG_NET_VENDOR_RENESAS=y
CONFIG_NET_VENDOR_ROCKER=y
CONFIG_NET_VENDOR_SAMSUNG=y
# CONFIG_SXGBE_ETH is not set
CONFIG_NET_VENDOR_SEEQ=y
CONFIG_NET_VENDOR_SILAN=y
# CONFIG_SC92031 is not set
CONFIG_NET_VENDOR_SIS=y
# CONFIG_SIS900 is not set
# CONFIG_SIS190 is not set
CONFIG_NET_VENDOR_SOLARFLARE=y
# CONFIG_SFC is not set
# CONFIG_SFC_FALCON is not set
# CONFIG_SFC_SIENA is not set
CONFIG_NET_VENDOR_SMSC=y
# CONFIG_SMC9194 is not set
# CONFIG_EPIC100 is not set
# CONFIG_SMSC911X is not set
# CONFIG_SMSC9420 is not set
CONFIG_NET_VENDOR_SOCIONEXT=y
CONFIG_NET_VENDOR_STMICRO=y
# CONFIG_STMMAC_ETH is not set
CONFIG_NET_VENDOR_SUN=y
# CONFIG_HAPPYMEAL is not set
# CONFIG_SUNGEM is not set
# CONFIG_CASSINI is not set
# CONFIG_NIU is not set
CONFIG_NET_VENDOR_SYNOPSYS=y
# CONFIG_DWC_XLGMAC is not set
CONFIG_NET_VENDOR_TEHUTI=y
# CONFIG_TEHUTI is not set
CONFIG_NET_VENDOR_TI=y
# CONFIG_TI_CPSW_PHY_SEL is not set
# CONFIG_TLAN is not set
CONFIG_NET_VENDOR_VERTEXCOM=y
CONFIG_NET_VENDOR_VIA=y
# CONFIG_VIA_RHINE is not set
# CONFIG_VIA_VELOCITY is not set
CONFIG_NET_VENDOR_WIZNET=y
# CONFIG_WIZNET_W5100 is not set
# CONFIG_WIZNET_W5300 is not set
CONFIG_NET_VENDOR_XILINX=y
# CONFIG_XILINX_EMACLITE is not set
# CONFIG_XILINX_AXI_EMAC is not set
# CONFIG_XILINX_LL_TEMAC is not set
# CONFIG_FDDI is not set
# CONFIG_HIPPI is not set
# CONFIG_NET_SB1000 is not set
# CONFIG_PHYLIB is not set
# CONFIG_PSE_CONTROLLER is not set
# CONFIG_MDIO_DEVICE is not set
#
# PCS device drivers
#
# end of PCS device drivers
# CONFIG_PPP is not set
# CONFIG_SLIP is not set
#
# Host-side USB support is needed for USB Network Adapter support
#
CONFIG_WLAN=y
CONFIG_WLAN_VENDOR_ADMTEK=y
CONFIG_WLAN_VENDOR_ATH=y
# CONFIG_ATH_DEBUG is not set
# CONFIG_ATH5K_PCI is not set
CONFIG_WLAN_VENDOR_ATMEL=y
CONFIG_WLAN_VENDOR_BROADCOM=y
CONFIG_WLAN_VENDOR_CISCO=y
CONFIG_WLAN_VENDOR_INTEL=y
CONFIG_WLAN_VENDOR_INTERSIL=y
# CONFIG_HOSTAP is not set
CONFIG_WLAN_VENDOR_MARVELL=y
CONFIG_WLAN_VENDOR_MEDIATEK=y
CONFIG_WLAN_VENDOR_MICROCHIP=y
CONFIG_WLAN_VENDOR_PURELIFI=y
CONFIG_WLAN_VENDOR_RALINK=y
CONFIG_WLAN_VENDOR_REALTEK=y
CONFIG_WLAN_VENDOR_RSI=y
CONFIG_WLAN_VENDOR_SILABS=y
CONFIG_WLAN_VENDOR_ST=y
CONFIG_WLAN_VENDOR_TI=y
CONFIG_WLAN_VENDOR_ZYDAS=y
CONFIG_WLAN_VENDOR_QUANTENNA=y
# CONFIG_WAN is not set
#
# Wireless WAN
#
# CONFIG_WWAN is not set
# end of Wireless WAN
# CONFIG_VMXNET3 is not set
# CONFIG_NET_FAILOVER is not set
# CONFIG_ISDN is not set
#
# Input device support
#
CONFIG_INPUT=y
CONFIG_INPUT_FF_MEMLESS=y
# CONFIG_INPUT_SPARSEKMAP is not set
# CONFIG_INPUT_MATRIXKMAP is not set
CONFIG_INPUT_VIVALDIFMAP=y
#
# Userland interfaces
#
# CONFIG_INPUT_MOUSEDEV is not set
# CONFIG_INPUT_JOYDEV is not set
# CONFIG_INPUT_EVDEV is not set
# CONFIG_INPUT_EVBUG is not set
#
# Input Device Drivers
#
CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_ATKBD=y
# CONFIG_KEYBOARD_LKKBD is not set
# CONFIG_KEYBOARD_NEWTON is not set
# CONFIG_KEYBOARD_OPENCORES is not set
# CONFIG_KEYBOARD_STOWAWAY is not set
# CONFIG_KEYBOARD_SUNKBD is not set
# CONFIG_KEYBOARD_XTKBD is not set
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_PS2=y
CONFIG_MOUSE_PS2_ALPS=y
CONFIG_MOUSE_PS2_BYD=y
CONFIG_MOUSE_PS2_LOGIPS2PP=y
CONFIG_MOUSE_PS2_SYNAPTICS=y
CONFIG_MOUSE_PS2_CYPRESS=y
CONFIG_MOUSE_PS2_TRACKPOINT=y
# CONFIG_MOUSE_PS2_ELANTECH is not set
# CONFIG_MOUSE_PS2_SENTELIC is not set
# CONFIG_MOUSE_PS2_TOUCHKIT is not set
CONFIG_MOUSE_PS2_FOCALTECH=y
# CONFIG_MOUSE_SERIAL is not set
# CONFIG_MOUSE_APPLETOUCH is not set
# CONFIG_MOUSE_BCM5974 is not set
# CONFIG_MOUSE_INPORT is not set
# CONFIG_MOUSE_LOGIBM is not set
# CONFIG_MOUSE_PC110PAD is not set
# CONFIG_MOUSE_VSXXXAA is not set
# CONFIG_MOUSE_SYNAPTICS_USB is not set
# CONFIG_INPUT_JOYSTICK is not set
# CONFIG_INPUT_TABLET is not set
# CONFIG_INPUT_TOUCHSCREEN is not set
# CONFIG_INPUT_MISC is not set
# CONFIG_RMI4_CORE is not set
#
# Hardware I/O ports
#
CONFIG_SERIO=y
CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
CONFIG_SERIO_I8042=y
CONFIG_SERIO_SERPORT=y
# CONFIG_SERIO_PCIPS2 is not set
CONFIG_SERIO_LIBPS2=y
# CONFIG_SERIO_RAW is not set
# CONFIG_SERIO_ALTERA_PS2 is not set
# CONFIG_SERIO_PS2MULT is not set
# CONFIG_SERIO_ARC_PS2 is not set
# CONFIG_USERIO is not set
# CONFIG_GAMEPORT is not set
# end of Hardware I/O ports
# end of Input device support
#
# Character devices
#
CONFIG_TTY=y
CONFIG_VT=y
CONFIG_CONSOLE_TRANSLATIONS=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
# CONFIG_VT_HW_CONSOLE_BINDING is not set
CONFIG_UNIX98_PTYS=y
CONFIG_LEGACY_PTYS=y
CONFIG_LEGACY_PTY_COUNT=256
CONFIG_LDISC_AUTOLOAD=y
#
# Serial drivers
#
CONFIG_SERIAL_EARLYCON=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_DEPRECATED_OPTIONS=y
CONFIG_SERIAL_8250_PNP=y
CONFIG_SERIAL_8250_16550A_VARIANTS=y
# CONFIG_SERIAL_8250_FINTEK is not set
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_PCI=y
CONFIG_SERIAL_8250_EXAR=y
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
# CONFIG_SERIAL_8250_EXTENDED is not set
# CONFIG_SERIAL_8250_DW is not set
# CONFIG_SERIAL_8250_RT288X is not set
CONFIG_SERIAL_8250_PERICOM=y
#
# Non-8250 serial port support
#
# CONFIG_SERIAL_UARTLITE is not set
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
# CONFIG_SERIAL_JSM is not set
# CONFIG_SERIAL_SCCNXP is not set
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
# CONFIG_SERIAL_ARC is not set
# CONFIG_SERIAL_RP2 is not set
# CONFIG_SERIAL_FSL_LPUART is not set
# CONFIG_SERIAL_FSL_LINFLEXUART is not set
# end of Serial drivers
# CONFIG_SERIAL_NONSTANDARD is not set
# CONFIG_N_GSM is not set
# CONFIG_NOZOMI is not set
# CONFIG_NULL_TTY is not set
# CONFIG_SERIAL_DEV_BUS is not set
# CONFIG_VIRTIO_CONSOLE is not set
# CONFIG_IPMI_HANDLER is not set
CONFIG_HW_RANDOM=m
# CONFIG_HW_RANDOM_TIMERIOMEM is not set
# CONFIG_HW_RANDOM_BA431 is not set
# CONFIG_HW_RANDOM_XIPHERA is not set
# CONFIG_DTLK is not set
# CONFIG_APPLICOM is not set
CONFIG_DEVMEM=y
CONFIG_DEVPORT=y
# CONFIG_TCG_TPM is not set
# CONFIG_XILLYBUS is not set
CONFIG_RANDOM_TRUST_CPU=y
CONFIG_RANDOM_TRUST_BOOTLOADER=y
# end of Character devices
#
# I2C support
#
# CONFIG_I2C is not set
# end of I2C support
# CONFIG_I3C is not set
# CONFIG_SPI is not set
# CONFIG_SPMI is not set
# CONFIG_HSI is not set
CONFIG_PPS=y
# CONFIG_PPS_DEBUG is not set
# CONFIG_NTP_PPS is not set
#
# PPS clients support
#
# CONFIG_PPS_CLIENT_KTIMER is not set
# CONFIG_PPS_CLIENT_LDISC is not set
# CONFIG_PPS_CLIENT_GPIO is not set
#
# PPS generators support
#
#
# PTP clock support
#
CONFIG_PTP_1588_CLOCK=y
CONFIG_PTP_1588_CLOCK_OPTIONAL=y
#
# Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
#
# end of PTP clock support
# CONFIG_PINCTRL is not set
# CONFIG_GPIOLIB is not set
# CONFIG_W1 is not set
# CONFIG_POWER_RESET is not set
# CONFIG_POWER_SUPPLY is not set
CONFIG_HWMON=y
# CONFIG_HWMON_DEBUG_CHIP is not set
#
# Native drivers
#
# CONFIG_SENSORS_AS370 is not set
# CONFIG_SENSORS_AXI_FAN_CONTROL is not set
# CONFIG_SENSORS_CORSAIR_CPRO is not set
# CONFIG_SENSORS_CORSAIR_PSU is not set
# CONFIG_SENSORS_DRIVETEMP is not set
# CONFIG_SENSORS_I5K_AMB is not set
# CONFIG_SENSORS_F71805F is not set
# CONFIG_SENSORS_F71882FG is not set
# CONFIG_SENSORS_IT87 is not set
# CONFIG_SENSORS_MAX197 is not set
# CONFIG_SENSORS_MR75203 is not set
# CONFIG_SENSORS_PC87360 is not set
# CONFIG_SENSORS_PC87427 is not set
# CONFIG_SENSORS_NCT6683 is not set
# CONFIG_SENSORS_NCT6775 is not set
# CONFIG_SENSORS_NPCM7XX is not set
# CONFIG_SENSORS_SIS5595 is not set
# CONFIG_SENSORS_SMSC47M1 is not set
# CONFIG_SENSORS_SMSC47B397 is not set
# CONFIG_SENSORS_VIA686A is not set
# CONFIG_SENSORS_VT1211 is not set
# CONFIG_SENSORS_VT8231 is not set
# CONFIG_SENSORS_W83627HF is not set
# CONFIG_SENSORS_W83627EHF is not set
# CONFIG_THERMAL is not set
# CONFIG_WATCHDOG is not set
CONFIG_SSB_POSSIBLE=y
# CONFIG_SSB is not set
CONFIG_BCMA_POSSIBLE=y
# CONFIG_BCMA is not set
#
# Multifunction device drivers
#
# CONFIG_MFD_MADERA is not set
# CONFIG_HTC_PASIC3 is not set
# CONFIG_LPC_ICH is not set
# CONFIG_LPC_SCH is not set
# CONFIG_MFD_JANZ_CMODIO is not set
# CONFIG_MFD_KEMPLD is not set
# CONFIG_MFD_MT6397 is not set
# CONFIG_MFD_RDC321X is not set
# CONFIG_MFD_SM501 is not set
# CONFIG_MFD_SYSCON is not set
# CONFIG_MFD_TI_AM335X_TSCADC is not set
# CONFIG_MFD_TQMX86 is not set
# CONFIG_MFD_VX855 is not set
# end of Multifunction device drivers
# CONFIG_REGULATOR is not set
# CONFIG_RC_CORE is not set
#
# CEC support
#
# CONFIG_MEDIA_CEC_SUPPORT is not set
# end of CEC support
# CONFIG_MEDIA_SUPPORT is not set
#
# Graphics support
#
# CONFIG_AGP is not set
# CONFIG_DRM is not set
#
# ARM devices
#
# end of ARM devices
#
# Frame buffer Devices
#
# CONFIG_FB is not set
# end of Frame buffer Devices
#
# Backlight & LCD device support
#
# CONFIG_LCD_CLASS_DEVICE is not set
# CONFIG_BACKLIGHT_CLASS_DEVICE is not set
# end of Backlight & LCD device support
#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
# CONFIG_MDA_CONSOLE is not set
CONFIG_DUMMY_CONSOLE_COLUMNS=80
CONFIG_DUMMY_CONSOLE_ROWS=25
# end of Console display driver support
# end of Graphics support
# CONFIG_SOUND is not set
#
# HID support
#
CONFIG_HID=y
# CONFIG_HID_BATTERY_STRENGTH is not set
# CONFIG_HIDRAW is not set
# CONFIG_UHID is not set
CONFIG_HID_GENERIC=y
#
# Special HID drivers
#
CONFIG_HID_A4TECH=y
# CONFIG_HID_ACRUX is not set
# CONFIG_HID_AUREAL is not set
CONFIG_HID_BELKIN=y
CONFIG_HID_CHERRY=y
# CONFIG_HID_COUGAR is not set
# CONFIG_HID_MACALLY is not set
# CONFIG_HID_CMEDIA is not set
CONFIG_HID_CYPRESS=y
# CONFIG_HID_DRAGONRISE is not set
# CONFIG_HID_EMS_FF is not set
# CONFIG_HID_ELECOM is not set
CONFIG_HID_EZKEY=y
# CONFIG_HID_GEMBIRD is not set
# CONFIG_HID_GFRM is not set
# CONFIG_HID_GLORIOUS is not set
# CONFIG_HID_VIVALDI is not set
# CONFIG_HID_KEYTOUCH is not set
# CONFIG_HID_KYE is not set
# CONFIG_HID_WALTOP is not set
# CONFIG_HID_VIEWSONIC is not set
# CONFIG_HID_VRC2 is not set
# CONFIG_HID_XIAOMI is not set
# CONFIG_HID_GYRATION is not set
# CONFIG_HID_ICADE is not set
CONFIG_HID_ITE=y
# CONFIG_HID_JABRA is not set
# CONFIG_HID_TWINHAN is not set
CONFIG_HID_KENSINGTON=y
# CONFIG_HID_LCPOWER is not set
# CONFIG_HID_LENOVO is not set
# CONFIG_HID_MAGICMOUSE is not set
# CONFIG_HID_MALTRON is not set
# CONFIG_HID_MAYFLASH is not set
CONFIG_HID_REDRAGON=y
CONFIG_HID_MICROSOFT=y
CONFIG_HID_MONTEREY=y
# CONFIG_HID_MULTITOUCH is not set
# CONFIG_HID_NTI is not set
# CONFIG_HID_ORTEK is not set
# CONFIG_HID_PANTHERLORD is not set
# CONFIG_HID_PETALYNX is not set
# CONFIG_HID_PICOLCD is not set
# CONFIG_HID_PLANTRONICS is not set
# CONFIG_HID_PXRC is not set
# CONFIG_HID_RAZER is not set
# CONFIG_HID_PRIMAX is not set
# CONFIG_HID_SAITEK is not set
# CONFIG_HID_SEMITEK is not set
# CONFIG_HID_SPEEDLINK is not set
# CONFIG_HID_STEAM is not set
# CONFIG_HID_STEELSERIES is not set
# CONFIG_HID_SUNPLUS is not set
# CONFIG_HID_RMI is not set
# CONFIG_HID_GREENASIA is not set
# CONFIG_HID_SMARTJOYPLUS is not set
# CONFIG_HID_TIVO is not set
# CONFIG_HID_TOPSEED is not set
# CONFIG_HID_TOPRE is not set
# CONFIG_HID_UDRAW_PS3 is not set
# CONFIG_HID_XINMO is not set
# CONFIG_HID_ZEROPLUS is not set
# CONFIG_HID_ZYDACRON is not set
# CONFIG_HID_SENSOR_HUB is not set
# CONFIG_HID_ALPS is not set
# end of Special HID drivers
# end of HID support
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
CONFIG_USB_SUPPORT=y
# CONFIG_USB_ULPI_BUS is not set
CONFIG_USB_ARCH_HAS_HCD=y
# CONFIG_USB is not set
CONFIG_USB_PCI=y
#
# USB port drivers
#
#
# USB Physical Layer drivers
#
# CONFIG_NOP_USB_XCEIV is not set
# end of USB Physical Layer drivers
# CONFIG_USB_GADGET is not set
# CONFIG_TYPEC is not set
# CONFIG_USB_ROLE_SWITCH is not set
# CONFIG_MMC is not set
# CONFIG_SCSI_UFSHCD is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_ACCESSIBILITY is not set
CONFIG_RTC_LIB=y
CONFIG_RTC_MC146818_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
CONFIG_RTC_SYSTOHC=y
CONFIG_RTC_SYSTOHC_DEVICE="rtc0"
# CONFIG_RTC_DEBUG is not set
CONFIG_RTC_NVMEM=y
#
# RTC interfaces
#
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
# CONFIG_RTC_INTF_DEV_UIE_EMUL is not set
# CONFIG_RTC_DRV_TEST is not set
#
# I2C RTC drivers
#
#
# SPI RTC drivers
#
#
# SPI and I2C RTC drivers
#
#
# Platform RTC drivers
#
CONFIG_RTC_DRV_ALPHA=y
# CONFIG_RTC_DRV_DS1286 is not set
# CONFIG_RTC_DRV_DS1511 is not set
# CONFIG_RTC_DRV_DS1553 is not set
# CONFIG_RTC_DRV_DS1685_FAMILY is not set
# CONFIG_RTC_DRV_DS1742 is not set
# CONFIG_RTC_DRV_DS2404 is not set
# CONFIG_RTC_DRV_STK17TA8 is not set
# CONFIG_RTC_DRV_M48T86 is not set
# CONFIG_RTC_DRV_M48T35 is not set
# CONFIG_RTC_DRV_M48T59 is not set
# CONFIG_RTC_DRV_MSM6242 is not set
# CONFIG_RTC_DRV_BQ4802 is not set
# CONFIG_RTC_DRV_RP5C01 is not set
# CONFIG_RTC_DRV_V3020 is not set
#
# on-CPU RTC drivers
#
# CONFIG_RTC_DRV_FTRTC010 is not set
#
# HID Sensor RTC drivers
#
# CONFIG_RTC_DRV_GOLDFISH is not set
# CONFIG_DMADEVICES is not set
#
# DMABUF options
#
# CONFIG_SYNC_FILE is not set
# CONFIG_DMABUF_HEAPS is not set
# end of DMABUF options
# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set
# CONFIG_VFIO is not set
# CONFIG_VIRT_DRIVERS is not set
CONFIG_VIRTIO_MENU=y
# CONFIG_VIRTIO_PCI is not set
# CONFIG_VIRTIO_MMIO is not set
# CONFIG_VDPA is not set
CONFIG_VHOST_MENU=y
# CONFIG_VHOST_NET is not set
# CONFIG_VHOST_CROSS_ENDIAN_LEGACY is not set
#
# Microsoft Hyper-V guest support
#
# end of Microsoft Hyper-V guest support
# CONFIG_GREYBUS is not set
# CONFIG_COMEDI is not set
# CONFIG_STAGING is not set
# CONFIG_GOLDFISH is not set
# CONFIG_COMMON_CLK is not set
# CONFIG_HWSPINLOCK is not set
#
# Clock Source drivers
#
CONFIG_I8253_LOCK=y
CONFIG_CLKBLD_I8253=y
# end of Clock Source drivers
# CONFIG_MAILBOX is not set
CONFIG_IOMMU_SUPPORT=y
#
# Generic IOMMU Pagetable Support
#
# end of Generic IOMMU Pagetable Support
#
# Remoteproc drivers
#
# CONFIG_REMOTEPROC is not set
# end of Remoteproc drivers
#
# Rpmsg drivers
#
# CONFIG_RPMSG_VIRTIO is not set
# end of Rpmsg drivers
#
# SOC (System On Chip) specific Drivers
#
#
# Amlogic SoC drivers
#
# end of Amlogic SoC drivers
#
# Broadcom SoC drivers
#
# end of Broadcom SoC drivers
#
# NXP/Freescale QorIQ SoC drivers
#
# end of NXP/Freescale QorIQ SoC drivers
#
# fujitsu SoC drivers
#
# end of fujitsu SoC drivers
#
# i.MX SoC drivers
#
# end of i.MX SoC drivers
#
# Enable LiteX SoC Builder specific drivers
#
# end of Enable LiteX SoC Builder specific drivers
#
# Qualcomm SoC drivers
#
# end of Qualcomm SoC drivers
# CONFIG_SOC_TI is not set
#
# Xilinx SoC drivers
#
# end of Xilinx SoC drivers
# end of SOC (System On Chip) specific Drivers
# CONFIG_PM_DEVFREQ is not set
# CONFIG_EXTCON is not set
# CONFIG_MEMORY is not set
# CONFIG_IIO is not set
# CONFIG_NTB is not set
# CONFIG_PWM is not set
#
# IRQ chip support
#
# end of IRQ chip support
# CONFIG_IPACK_BUS is not set
# CONFIG_RESET_CONTROLLER is not set
#
# PHY Subsystem
#
# CONFIG_GENERIC_PHY is not set
# CONFIG_PHY_CAN_TRANSCEIVER is not set
#
# PHY drivers for Broadcom platforms
#
# CONFIG_BCM_KONA_USB2_PHY is not set
# end of PHY drivers for Broadcom platforms
# CONFIG_PHY_PXA_28NM_HSIC is not set
# CONFIG_PHY_PXA_28NM_USB2 is not set
# end of PHY Subsystem
# CONFIG_POWERCAP is not set
# CONFIG_MCB is not set
# CONFIG_RAS is not set
# CONFIG_USB4 is not set
#
# Android
#
# CONFIG_ANDROID_BINDER_IPC is not set
# end of Android
# CONFIG_LIBNVDIMM is not set
# CONFIG_DAX is not set
CONFIG_NVMEM=y
CONFIG_NVMEM_SYSFS=y
# CONFIG_NVMEM_RMEM is not set
#
# HW tracing support
#
# CONFIG_STM is not set
# CONFIG_INTEL_TH is not set
# end of HW tracing support
# CONFIG_FPGA is not set
# CONFIG_SIOX is not set
# CONFIG_SLIMBUS is not set
# CONFIG_INTERCONNECT is not set
# CONFIG_COUNTER is not set
# CONFIG_PECI is not set
# CONFIG_HTE is not set
# end of Device Drivers
#
# File systems
#
# CONFIG_VALIDATE_FS_PARSER is not set
CONFIG_FS_IOMAP=y
CONFIG_EXT2_FS=y
# CONFIG_EXT2_FS_XATTR is not set
# CONFIG_EXT3_FS is not set
# CONFIG_EXT4_FS is not set
CONFIG_REISERFS_FS=m
# CONFIG_REISERFS_CHECK is not set
# CONFIG_REISERFS_PROC_INFO is not set
# CONFIG_REISERFS_FS_XATTR is not set
# CONFIG_JFS_FS is not set
# CONFIG_XFS_FS is not set
# CONFIG_GFS2_FS is not set
# CONFIG_BTRFS_FS is not set
# CONFIG_NILFS2_FS is not set
# CONFIG_F2FS_FS is not set
CONFIG_EXPORTFS=y
# CONFIG_EXPORTFS_BLOCK_OPS is not set
CONFIG_FILE_LOCKING=y
# CONFIG_FS_ENCRYPTION is not set
# CONFIG_FS_VERITY is not set
CONFIG_FSNOTIFY=y
CONFIG_DNOTIFY=y
CONFIG_INOTIFY_USER=y
# CONFIG_FANOTIFY is not set
# CONFIG_QUOTA is not set
# CONFIG_AUTOFS4_FS is not set
# CONFIG_AUTOFS_FS is not set
# CONFIG_FUSE_FS is not set
# CONFIG_OVERLAY_FS is not set
#
# Caches
#
# CONFIG_FSCACHE is not set
# end of Caches
#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=y
# CONFIG_JOLIET is not set
# CONFIG_ZISOFS is not set
# CONFIG_UDF_FS is not set
# end of CD-ROM/DVD Filesystems
#
# DOS/FAT/EXFAT/NT Filesystems
#
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
# CONFIG_FAT_DEFAULT_UTF8 is not set
# CONFIG_EXFAT_FS is not set
# CONFIG_NTFS_FS is not set
# CONFIG_NTFS3_FS is not set
# end of DOS/FAT/EXFAT/NT Filesystems
#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_SYSCTL=y
CONFIG_PROC_PAGE_MONITOR=y
# CONFIG_PROC_CHILDREN is not set
CONFIG_KERNFS=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
# CONFIG_TMPFS_POSIX_ACL is not set
# CONFIG_TMPFS_XATTR is not set
# CONFIG_TMPFS_INODE64 is not set
CONFIG_MEMFD_CREATE=y
# CONFIG_CONFIGFS_FS is not set
# end of Pseudo filesystems
CONFIG_MISC_FILESYSTEMS=y
# CONFIG_ORANGEFS_FS is not set
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_HFSPLUS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_CRAMFS is not set
# CONFIG_SQUASHFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_MINIX_FS is not set
# CONFIG_OMFS_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_QNX6FS_FS is not set
# CONFIG_ROMFS_FS is not set
# CONFIG_PSTORE is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set
# CONFIG_EROFS_FS is not set
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=m
CONFIG_NFS_V2=m
CONFIG_NFS_V3=m
# CONFIG_NFS_V3_ACL is not set
# CONFIG_NFS_V4 is not set
# CONFIG_NFS_SWAP is not set
CONFIG_NFS_DISABLE_UDP_SUPPORT=y
CONFIG_NFSD=m
# CONFIG_NFSD_V3_ACL is not set
# CONFIG_NFSD_V4 is not set
CONFIG_GRACE_PERIOD=m
CONFIG_LOCKD=m
CONFIG_LOCKD_V4=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=m
# CONFIG_SUNRPC_DEBUG is not set
# CONFIG_CEPH_FS is not set
# CONFIG_CIFS is not set
# CONFIG_SMB_SERVER is not set
# CONFIG_CODA_FS is not set
# CONFIG_AFS_FS is not set
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
# CONFIG_NLS_CODEPAGE_737 is not set
# CONFIG_NLS_CODEPAGE_775 is not set
# CONFIG_NLS_CODEPAGE_850 is not set
# CONFIG_NLS_CODEPAGE_852 is not set
# CONFIG_NLS_CODEPAGE_855 is not set
# CONFIG_NLS_CODEPAGE_857 is not set
# CONFIG_NLS_CODEPAGE_860 is not set
# CONFIG_NLS_CODEPAGE_861 is not set
# CONFIG_NLS_CODEPAGE_862 is not set
# CONFIG_NLS_CODEPAGE_863 is not set
# CONFIG_NLS_CODEPAGE_864 is not set
# CONFIG_NLS_CODEPAGE_865 is not set
# CONFIG_NLS_CODEPAGE_866 is not set
# CONFIG_NLS_CODEPAGE_869 is not set
# CONFIG_NLS_CODEPAGE_936 is not set
# CONFIG_NLS_CODEPAGE_950 is not set
# CONFIG_NLS_CODEPAGE_932 is not set
# CONFIG_NLS_CODEPAGE_949 is not set
# CONFIG_NLS_CODEPAGE_874 is not set
# CONFIG_NLS_ISO8859_8 is not set
# CONFIG_NLS_CODEPAGE_1250 is not set
# CONFIG_NLS_CODEPAGE_1251 is not set
# CONFIG_NLS_ASCII is not set
# CONFIG_NLS_ISO8859_1 is not set
# CONFIG_NLS_ISO8859_2 is not set
# CONFIG_NLS_ISO8859_3 is not set
# CONFIG_NLS_ISO8859_4 is not set
# CONFIG_NLS_ISO8859_5 is not set
# CONFIG_NLS_ISO8859_6 is not set
# CONFIG_NLS_ISO8859_7 is not set
# CONFIG_NLS_ISO8859_9 is not set
# CONFIG_NLS_ISO8859_13 is not set
# CONFIG_NLS_ISO8859_14 is not set
# CONFIG_NLS_ISO8859_15 is not set
# CONFIG_NLS_KOI8_R is not set
# CONFIG_NLS_KOI8_U is not set
# CONFIG_NLS_MAC_ROMAN is not set
# CONFIG_NLS_MAC_CELTIC is not set
# CONFIG_NLS_MAC_CENTEURO is not set
# CONFIG_NLS_MAC_CROATIAN is not set
# CONFIG_NLS_MAC_CYRILLIC is not set
# CONFIG_NLS_MAC_GAELIC is not set
# CONFIG_NLS_MAC_GREEK is not set
# CONFIG_NLS_MAC_ICELAND is not set
# CONFIG_NLS_MAC_INUIT is not set
# CONFIG_NLS_MAC_ROMANIAN is not set
# CONFIG_NLS_MAC_TURKISH is not set
# CONFIG_NLS_UTF8 is not set
# CONFIG_UNICODE is not set
CONFIG_IO_WQ=y
# end of File systems
#
# Security options
#
# CONFIG_KEYS is not set
# CONFIG_SECURITY_DMESG_RESTRICT is not set
# CONFIG_SECURITY is not set
# CONFIG_SECURITYFS is not set
CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR=y
# CONFIG_HARDENED_USERCOPY is not set
# CONFIG_STATIC_USERMODEHELPER is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_LSM="landlock,lockdown,yama,loadpin,safesetid,integrity,bpf"
#
# Kernel hardening options
#
#
# Memory initialization
#
CONFIG_CC_HAS_AUTO_VAR_INIT_PATTERN=y
CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_BARE=y
CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO=y
# CONFIG_INIT_STACK_NONE is not set
# CONFIG_INIT_STACK_ALL_PATTERN is not set
CONFIG_INIT_STACK_ALL_ZERO=y
# CONFIG_INIT_ON_ALLOC_DEFAULT_ON is not set
# CONFIG_INIT_ON_FREE_DEFAULT_ON is not set
CONFIG_CC_HAS_ZERO_CALL_USED_REGS=y
# CONFIG_ZERO_CALL_USED_REGS is not set
# end of Memory initialization
CONFIG_RANDSTRUCT_NONE=y
# end of Kernel hardening options
# end of Security options
CONFIG_CRYPTO=m
#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=m
CONFIG_CRYPTO_ALGAPI2=m
CONFIG_CRYPTO_AEAD=m
CONFIG_CRYPTO_AEAD2=m
CONFIG_CRYPTO_SKCIPHER=m
CONFIG_CRYPTO_SKCIPHER2=m
CONFIG_CRYPTO_HASH=m
CONFIG_CRYPTO_HASH2=m
CONFIG_CRYPTO_RNG=m
CONFIG_CRYPTO_RNG2=m
CONFIG_CRYPTO_RNG_DEFAULT=m
CONFIG_CRYPTO_AKCIPHER2=m
CONFIG_CRYPTO_KPP2=m
CONFIG_CRYPTO_ACOMP2=m
CONFIG_CRYPTO_MANAGER=m
CONFIG_CRYPTO_MANAGER2=m
# CONFIG_CRYPTO_USER is not set
CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
CONFIG_CRYPTO_GF128MUL=m
CONFIG_CRYPTO_NULL=m
CONFIG_CRYPTO_NULL2=m
# CONFIG_CRYPTO_CRYPTD is not set
CONFIG_CRYPTO_AUTHENC=m
# CONFIG_CRYPTO_TEST is not set
# end of Crypto core or helper
#
# Public-key cryptography
#
# CONFIG_CRYPTO_RSA is not set
# CONFIG_CRYPTO_DH is not set
# CONFIG_CRYPTO_ECDH is not set
# CONFIG_CRYPTO_ECDSA is not set
# CONFIG_CRYPTO_ECRDSA is not set
# CONFIG_CRYPTO_SM2 is not set
# CONFIG_CRYPTO_CURVE25519 is not set
# end of Public-key cryptography
#
# Block ciphers
#
CONFIG_CRYPTO_AES=m
# CONFIG_CRYPTO_AES_TI is not set
# CONFIG_CRYPTO_ARIA is not set
# CONFIG_CRYPTO_BLOWFISH is not set
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_CAST5 is not set
# CONFIG_CRYPTO_CAST6 is not set
# CONFIG_CRYPTO_DES is not set
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_SERPENT is not set
# CONFIG_CRYPTO_SM4_GENERIC is not set
# CONFIG_CRYPTO_TWOFISH is not set
# end of Block ciphers
#
# Length-preserving ciphers and modes
#
# CONFIG_CRYPTO_ADIANTUM is not set
# CONFIG_CRYPTO_CHACHA20 is not set
CONFIG_CRYPTO_CBC=m
# CONFIG_CRYPTO_CFB is not set
CONFIG_CRYPTO_CTR=m
# CONFIG_CRYPTO_CTS is not set
# CONFIG_CRYPTO_ECB is not set
# CONFIG_CRYPTO_HCTR2 is not set
# CONFIG_CRYPTO_KEYWRAP is not set
# CONFIG_CRYPTO_LRW is not set
# CONFIG_CRYPTO_OFB is not set
# CONFIG_CRYPTO_PCBC is not set
# CONFIG_CRYPTO_XTS is not set
# end of Length-preserving ciphers and modes
#
# AEAD (authenticated encryption with associated data) ciphers
#
# CONFIG_CRYPTO_AEGIS128 is not set
# CONFIG_CRYPTO_CHACHA20POLY1305 is not set
# CONFIG_CRYPTO_CCM is not set
CONFIG_CRYPTO_GCM=m
CONFIG_CRYPTO_SEQIV=m
CONFIG_CRYPTO_ECHAINIV=m
# CONFIG_CRYPTO_ESSIV is not set
# end of AEAD (authenticated encryption with associated data) ciphers
#
# Hashes, digests, and MACs
#
# CONFIG_CRYPTO_BLAKE2B is not set
# CONFIG_CRYPTO_CMAC is not set
CONFIG_CRYPTO_GHASH=m
CONFIG_CRYPTO_HMAC=m
# CONFIG_CRYPTO_MD4 is not set
# CONFIG_CRYPTO_MD5 is not set
# CONFIG_CRYPTO_MICHAEL_MIC is not set
# CONFIG_CRYPTO_POLY1305 is not set
# CONFIG_CRYPTO_RMD160 is not set
# CONFIG_CRYPTO_SHA1 is not set
CONFIG_CRYPTO_SHA256=m
CONFIG_CRYPTO_SHA512=m
# CONFIG_CRYPTO_SHA3 is not set
# CONFIG_CRYPTO_SM3_GENERIC is not set
# CONFIG_CRYPTO_STREEBOG is not set
# CONFIG_CRYPTO_VMAC is not set
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_XCBC is not set
# CONFIG_CRYPTO_XXHASH is not set
# end of Hashes, digests, and MACs
#
# CRCs (cyclic redundancy checks)
#
# CONFIG_CRYPTO_CRC32C is not set
# CONFIG_CRYPTO_CRC32 is not set
# CONFIG_CRYPTO_CRCT10DIF is not set
# end of CRCs (cyclic redundancy checks)
#
# Compression
#
# CONFIG_CRYPTO_DEFLATE is not set
# CONFIG_CRYPTO_LZO is not set
# CONFIG_CRYPTO_842 is not set
# CONFIG_CRYPTO_LZ4 is not set
# CONFIG_CRYPTO_LZ4HC is not set
# CONFIG_CRYPTO_ZSTD is not set
# end of Compression
#
# Random number generation
#
# CONFIG_CRYPTO_ANSI_CPRNG is not set
CONFIG_CRYPTO_DRBG_MENU=m
CONFIG_CRYPTO_DRBG_HMAC=y
# CONFIG_CRYPTO_DRBG_HASH is not set
# CONFIG_CRYPTO_DRBG_CTR is not set
CONFIG_CRYPTO_DRBG=m
CONFIG_CRYPTO_JITTERENTROPY=m
# end of Random number generation
#
# Userspace interface
#
# CONFIG_CRYPTO_USER_API_HASH is not set
# CONFIG_CRYPTO_USER_API_SKCIPHER is not set
# CONFIG_CRYPTO_USER_API_RNG is not set
# CONFIG_CRYPTO_USER_API_AEAD is not set
# end of Userspace interface
CONFIG_CRYPTO_HW=y
# CONFIG_CRYPTO_DEV_QAT_DH895xCC is not set
# CONFIG_CRYPTO_DEV_QAT_C3XXX is not set
# CONFIG_CRYPTO_DEV_QAT_C62X is not set
# CONFIG_CRYPTO_DEV_QAT_4XXX is not set
# CONFIG_CRYPTO_DEV_QAT_DH895xCCVF is not set
# CONFIG_CRYPTO_DEV_QAT_C3XXXVF is not set
# CONFIG_CRYPTO_DEV_QAT_C62XVF is not set
# CONFIG_CRYPTO_DEV_SAFEXCEL is not set
# CONFIG_CRYPTO_DEV_AMLOGIC_GXL is not set
#
# Certificates for signature checking
#
# end of Certificates for signature checking
#
# Library routines
#
# CONFIG_PACKING is not set
CONFIG_BITREVERSE=y
CONFIG_GENERIC_STRNCPY_FROM_USER=y
CONFIG_GENERIC_STRNLEN_USER=y
CONFIG_GENERIC_NET_UTILS=y
# CONFIG_CORDIC is not set
# CONFIG_PRIME_NUMBERS is not set
CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
#
# Crypto library routines
#
CONFIG_CRYPTO_LIB_UTILS=m
CONFIG_CRYPTO_LIB_AES=m
CONFIG_CRYPTO_LIB_BLAKE2S_GENERIC=y
# CONFIG_CRYPTO_LIB_CHACHA is not set
# CONFIG_CRYPTO_LIB_CURVE25519 is not set
CONFIG_CRYPTO_LIB_POLY1305_RSIZE=1
# CONFIG_CRYPTO_LIB_POLY1305 is not set
# CONFIG_CRYPTO_LIB_CHACHA20POLY1305 is not set
CONFIG_CRYPTO_LIB_SHA1=y
CONFIG_CRYPTO_LIB_SHA256=m
# end of Crypto library routines
# CONFIG_CRC_CCITT is not set
# CONFIG_CRC16 is not set
# CONFIG_CRC_T10DIF is not set
# CONFIG_CRC64_ROCKSOFT is not set
# CONFIG_CRC_ITU_T is not set
CONFIG_CRC32=y
# CONFIG_CRC32_SELFTEST is not set
CONFIG_CRC32_SLICEBY8=y
# CONFIG_CRC32_SLICEBY4 is not set
# CONFIG_CRC32_SARWATE is not set
# CONFIG_CRC32_BIT is not set
# CONFIG_CRC64 is not set
# CONFIG_CRC4 is not set
# CONFIG_CRC7 is not set
# CONFIG_LIBCRC32C is not set
# CONFIG_CRC8 is not set
# CONFIG_RANDOM32_SELFTEST is not set
# CONFIG_XZ_DEC is not set
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT_MAP=y
CONFIG_HAS_DMA=y
CONFIG_DMA_OPS=y
CONFIG_NEED_SG_DMA_LENGTH=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_ARCH_DMA_ADDR_T_64BIT=y
# CONFIG_DMA_API_DEBUG is not set
CONFIG_SGL_ALLOC=y
CONFIG_DQL=y
CONFIG_GLOB=y
# CONFIG_GLOB_SELFTEST is not set
CONFIG_NLATTR=y
# CONFIG_IRQ_POLL is not set
CONFIG_SG_POOL=y
CONFIG_ARCH_NO_SG_CHAIN=y
CONFIG_SBITMAP=y
# end of Library routines
#
# Kernel hacking
#
#
# printk and dmesg options
#
# CONFIG_PRINTK_TIME is not set
# CONFIG_PRINTK_CALLER is not set
# CONFIG_STACKTRACE_BUILD_ID is not set
CONFIG_CONSOLE_LOGLEVEL_DEFAULT=7
CONFIG_CONSOLE_LOGLEVEL_QUIET=4
CONFIG_MESSAGE_LOGLEVEL_DEFAULT=4
# CONFIG_BOOT_PRINTK_DELAY is not set
# CONFIG_DYNAMIC_DEBUG is not set
# CONFIG_DYNAMIC_DEBUG_CORE is not set
CONFIG_SYMBOLIC_ERRNAME=y
# end of printk and dmesg options
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_MISC=y
#
# Compile-time checks and compiler options
#
CONFIG_DEBUG_INFO=y
CONFIG_AS_HAS_NON_CONST_LEB128=y
# CONFIG_DEBUG_INFO_NONE is not set
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y
# CONFIG_DEBUG_INFO_DWARF4 is not set
# CONFIG_DEBUG_INFO_DWARF5 is not set
# CONFIG_DEBUG_INFO_REDUCED is not set
# CONFIG_DEBUG_INFO_COMPRESSED is not set
# CONFIG_DEBUG_INFO_SPLIT is not set
CONFIG_PAHOLE_HAS_SPLIT_BTF=y
# CONFIG_GDB_SCRIPTS is not set
CONFIG_FRAME_WARN=2048
# CONFIG_STRIP_ASM_SYMS is not set
# CONFIG_READABLE_ASM is not set
# CONFIG_HEADERS_INSTALL is not set
CONFIG_DEBUG_SECTION_MISMATCH=y
CONFIG_SECTION_MISMATCH_WARN_ONLY=y
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
# end of Compile-time checks and compiler options
#
# Generic Kernel Debugging Instruments
#
CONFIG_MAGIC_SYSRQ=y
CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1
CONFIG_MAGIC_SYSRQ_SERIAL=y
CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE=""
# CONFIG_DEBUG_FS is not set
# CONFIG_UBSAN is not set
CONFIG_HAVE_KCSAN_COMPILER=y
# end of Generic Kernel Debugging Instruments
#
# Networking Debugging
#
# CONFIG_DEBUG_NET is not set
# end of Networking Debugging
#
# Memory Debugging
#
# CONFIG_PAGE_EXTENSION is not set
# CONFIG_DEBUG_PAGEALLOC is not set
CONFIG_SLUB_DEBUG=y
# CONFIG_SLUB_DEBUG_ON is not set
# CONFIG_PAGE_POISONING is not set
# CONFIG_DEBUG_OBJECTS is not set
# CONFIG_DEBUG_STACK_USAGE is not set
# CONFIG_SCHED_STACK_END_CHECK is not set
# CONFIG_DEBUG_VM is not set
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS=y
# end of Memory Debugging
# CONFIG_DEBUG_SHIRQ is not set
#
# Debug Oops, Lockups and Hangs
#
# CONFIG_PANIC_ON_OOPS is not set
CONFIG_PANIC_ON_OOPS_VALUE=0
CONFIG_PANIC_TIMEOUT=0
# CONFIG_SOFTLOCKUP_DETECTOR is not set
# CONFIG_DETECT_HUNG_TASK is not set
# CONFIG_WQ_WATCHDOG is not set
# CONFIG_TEST_LOCKUP is not set
# end of Debug Oops, Lockups and Hangs
#
# Scheduler Debugging
#
CONFIG_SCHED_DEBUG=y
# CONFIG_SCHEDSTATS is not set
# end of Scheduler Debugging
# CONFIG_DEBUG_TIMEKEEPING is not set
#
# Lock Debugging (spinlocks, mutexes, etc...)
#
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_RWSEMS is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_LOCK_TORTURE_TEST is not set
# CONFIG_WW_MUTEX_SELFTEST is not set
# CONFIG_SCF_TORTURE_TEST is not set
# CONFIG_CSD_LOCK_WAIT_DEBUG is not set
# end of Lock Debugging (spinlocks, mutexes, etc...)
# CONFIG_DEBUG_IRQFLAGS is not set
# CONFIG_WARN_ALL_UNSEEDED_RANDOM is not set
# CONFIG_DEBUG_KOBJECT is not set
#
# Debug kernel data structures
#
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_PLIST is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_DEBUG_NOTIFIERS is not set
# CONFIG_BUG_ON_DATA_CORRUPTION is not set
# CONFIG_DEBUG_MAPLE_TREE is not set
# end of Debug kernel data structures
# CONFIG_DEBUG_CREDENTIALS is not set
#
# RCU Debugging
#
# CONFIG_RCU_SCALE_TEST is not set
# CONFIG_RCU_TORTURE_TEST is not set
# CONFIG_RCU_REF_SCALE_TEST is not set
# CONFIG_RCU_TRACE is not set
# CONFIG_RCU_EQS_DEBUG is not set
# end of RCU Debugging
# CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
# CONFIG_SAMPLES is not set
#
# alpha Debugging
#
CONFIG_EARLY_PRINTK=y
CONFIG_ALPHA_LEGACY_START_ADDRESS=y
CONFIG_MATHEMU=y
# end of alpha Debugging
#
# Kernel Testing and Coverage
#
# CONFIG_KUNIT is not set
# CONFIG_NOTIFIER_ERROR_INJECTION is not set
# CONFIG_FAULT_INJECTION is not set
CONFIG_CC_HAS_SANCOV_TRACE_PC=y
CONFIG_RUNTIME_TESTING_MENU=y
# CONFIG_TEST_MIN_HEAP is not set
# CONFIG_TEST_DIV64 is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_RBTREE_TEST is not set
# CONFIG_REED_SOLOMON_TEST is not set
# CONFIG_INTERVAL_TREE_TEST is not set
# CONFIG_PERCPU_TEST is not set
# CONFIG_ATOMIC64_SELFTEST is not set
# CONFIG_TEST_HEXDUMP is not set
# CONFIG_STRING_SELFTEST is not set
# CONFIG_TEST_STRING_HELPERS is not set
# CONFIG_TEST_STRSCPY is not set
# CONFIG_TEST_KSTRTOX is not set
# CONFIG_TEST_PRINTF is not set
# CONFIG_TEST_SCANF is not set
# CONFIG_TEST_BITMAP is not set
# CONFIG_TEST_UUID is not set
# CONFIG_TEST_XARRAY is not set
# CONFIG_TEST_RHASHTABLE is not set
# CONFIG_TEST_SIPHASH is not set
# CONFIG_TEST_IDA is not set
# CONFIG_TEST_LKM is not set
# CONFIG_TEST_BITOPS is not set
# CONFIG_TEST_VMALLOC is not set
# CONFIG_TEST_USER_COPY is not set
# CONFIG_TEST_BPF is not set
# CONFIG_TEST_BLACKHOLE_DEV is not set
# CONFIG_FIND_BIT_BENCHMARK is not set
# CONFIG_TEST_FIRMWARE is not set
# CONFIG_TEST_SYSCTL is not set
# CONFIG_TEST_UDELAY is not set
# CONFIG_TEST_STATIC_KEYS is not set
# CONFIG_TEST_KMOD is not set
# CONFIG_TEST_MEMCAT_P is not set
# CONFIG_TEST_MEMINIT is not set
# CONFIG_TEST_FREE_PAGES is not set
# end of Kernel Testing and Coverage
#
# Rust hacking
#
# end of Rust hacking
# end of Kernel hacking
^ permalink raw reply [flat|nested] 8+ messages in thread
* [RFC RESEND PATCH 0/2] Add support for sharing page tables across processes (Previously mshare)
@ 2023-01-20 16:08 ` Khalid Aziz
0 siblings, 0 replies; 8+ messages in thread
From: Khalid Aziz @ 2023-01-20 16:08 UTC (permalink / raw)
To: akpm, willy, djwong, markhemm, viro, david, mike.kravetz
Cc: Khalid Aziz, andreyknvl, dave.hansen, luto, 21cnbao, arnd,
ebiederm, elver, linux-arch, linux-kernel, linux-mm, mhiramat,
rostedt, vasily.averin, xhao
[Previously mshare patches. After discussion on mailing list and at
LSF/MM, mshare implementation has been reworked to eliminate the
mshare API and use mmap instead with a new flag. This eliminates the
need for msharefs. Alignment and size restrictions were changed to
PMD]
Memory pages shared between processes require a page table entry
(PTE) for each process. Each of these PTE consumes consume some of
the memory and as long as number of mappings being maintained is
small enough, this space consumed by page tables is not
objectionable. When very few memory pages are shared between
processes, the number of page table entries (PTEs) to maintain is
mostly constrained by the number of pages of memory on the system.
As the number of shared pages and the number of times pages are
shared goes up, amount of memory consumed by page tables starts to
become significant. This issue does not apply to threads. Any number
of threads can share the same pages inside a process while sharing
the same PTEs. Extending this same model to sharing pages across
processes can eliminate this issue for sharing across processes as
well.
Some of the field deployments commonly see memory pages shared
across 1000s of processes. On x86_64, each page requires a PTE that
is only 8 bytes long which is very small compared to the 4K page
size. When 2000 processes map the same page in their address space,
each one of them requires 8 bytes for its PTE and together that adds
up to 8K of memory just to hold the PTEs for one 4K page. On a
database server with 300GB SGA, a system crash was seen with
out-of-memory condition when 1500+ clients tried to share this SGA
even though the system had 512GB of memory. On this server, in the
worst case scenario of all 1500 processes mapping every page from
SGA would have required 878GB+ for just the PTEs. If these PTEs
could be shared, amount of memory saved is very significant.
This patch series adds a new flag to mmap() call - MAP_SHARED_PT.
This map can be specified along with MAP_SHARED by a process to hint
to kernel that it wishes to share page table entries for this file
mapping mmap region with other processes. Any other process that
mmaps the same file with MAP_SHARED_PT flag can then share the same
page table entries. Besides specifying MAP_SHARED_PT flag, the
processes must map the files at a PMD aligned address with a size
that is a multiple of PMD size and at the same virtual addresses.
This last requirement of same virtual addresses can possibly be
relaxed if that is the consensus.
When mmap() is called with MAP_SHARED_PT flag, a new host mm struct
is created to hold the shared page tables. Host mm struct is not
attached to a process. Start and size of host mm are set to the
start and size of the mmap region and a VMA covering this range is
also added to host mm struct. Existing page table entries from the
process that creates the mapping are copied over to the host mm
struct. All processes mapping this shared region are considered
guest processes. When a guest process mmap's the shared region, a vm
flag VM_SHARED_PT is added to the VMAs in guest process. Upon a page
fault, VMA is checked for the presence of VM_SHARED_PT flag. If the
flag is found, its corresponding PMD is updated with the PMD from
host mm struct so the PMD will point to the page tables in host mm
struct. vm_mm pointer of the VMA is also updated to point to host mm
struct for the duration of fault handling to ensure fault handling
happens in the context of host mm struct. When a new PTE is
created, it is created in the host mm struct page tables and the PMD
in guest mm points to the same PTEs.
This is a basic working implementation. It will need to go through
more testing and refinements. Some notes and questions:
- PMD size alignment and size requirement is currently hard coded
in. Is there a need or desire to make this more flexible and work
with other alignments/sizes? PMD size allows for adapting this
infrastructure to form the basis for hugetlbfs page table sharing
as well. More work ill be needed to make that happen.
- Is there a reason to allow a userspace app to query this size and
alignment requirement for MAP_SHARED_PT in some way?
- Shared PTEs means mprotect() call made by one process affects all
processes sharing the same mapping and that behavior will need to
be documented clearly. Effect of mprotect call being different for
processes using shared page tables is the primary reason to
require an explicit opt-in from userspace processes to share page
tables. With a transparent sharing derived from MAP_SHARED alone,
changed effect of mprotect can break significant number of
userspace apps. One could work around that by unsharing whenever
mprotect changes modes on shared mapping but that introduces
complexity and the capability to execute a single mprotect to
change modes across 1000's of processes sharing a mapped database
is a feature explicitly asked for by database folks. This
capability has significant performance advantage when compared to
mechanism of sending messages to every process using shared
mapping to call mprotect and change modes in each process, or
using traps on permissions mismatch in each process.
- This implementation does not allow unmapping page table shared
mappings partially. Should that be supported in future?
- Patch 2 will be broken up into smaller patches after RFC. It
likely is easier to review the proposal with all code in one patch
for now.
Khalid Aziz (2):
mm/ptshare: Add vm flag for shared PTE
mm/ptshare: Create a new mm to share pagetables
include/linux/fs.h | 1 +
include/linux/mm.h | 8 +
include/trace/events/mmflags.h | 3 +-
include/uapi/asm-generic/mman-common.h | 1 +
mm/Makefile | 2 +-
mm/internal.h | 21 ++
mm/memory.c | 52 ++++-
mm/mmap.c | 87 ++++++++
mm/ptshare.c | 262 +++++++++++++++++++++++++
9 files changed, 433 insertions(+), 4 deletions(-)
create mode 100644 mm/ptshare.c
--
2.34.1
^ permalink raw reply [flat|nested] 8+ messages in thread
* [RFC RESEND PATCH 1/2] mm/ptshare: Add vm flag for shared PTE
@ 2023-01-20 16:08 ` Khalid Aziz
0 siblings, 0 replies; 8+ messages in thread
From: Khalid Aziz @ 2023-01-20 16:08 UTC (permalink / raw)
To: akpm, willy, djwong, markhemm, viro, david, mike.kravetz
Cc: Khalid Aziz, andreyknvl, dave.hansen, luto, 21cnbao, arnd,
ebiederm, elver, linux-arch, linux-kernel, linux-mm, mhiramat,
rostedt, vasily.averin, xhao
Add a bit to vm_flags to indicate a vma shares PTEs with others. Add
a function to determine if a vma shares PTE by checking this flag.
This is to be used to find the shared page table entries on page fault
for vmas sharing PTE.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/mm.h | 8 ++++++++
include/trace/events/mmflags.h | 3 ++-
mm/internal.h | 5 +++++
3 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8bbcccbc5565..699323be7502 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -314,11 +314,13 @@ extern unsigned int kobjsize(const void *objp);
#define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */
#define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */
#define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */
+#define VM_HIGH_ARCH_BIT_5 37 /* bit only usable on 64-bit architectures */
#define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0)
#define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1)
#define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2)
#define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3)
#define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4)
+#define VM_HIGH_ARCH_5 BIT(VM_HIGH_ARCH_BIT_5)
#endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */
#ifdef CONFIG_ARCH_HAS_PKEYS
@@ -360,6 +362,12 @@ extern unsigned int kobjsize(const void *objp);
# define VM_MTE_ALLOWED VM_NONE
#endif
+#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
+#define VM_SHARED_PT VM_HIGH_ARCH_5
+#else
+#define VM_SHARED_PT VM_NONE
+#endif
+
#ifndef VM_GROWSUP
# define VM_GROWSUP VM_NONE
#endif
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index e87cb2b80ed3..30e56cbac99b 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -194,7 +194,8 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \
{VM_MIXEDMAP, "mixedmap" }, \
{VM_HUGEPAGE, "hugepage" }, \
{VM_NOHUGEPAGE, "nohugepage" }, \
- {VM_MERGEABLE, "mergeable" } \
+ {VM_MERGEABLE, "mergeable" }, \
+ {VM_SHARED_PT, "sharedpt" } \
#define show_vma_flags(flags) \
(flags) ? __print_flags(flags, "|", \
diff --git a/mm/internal.h b/mm/internal.h
index 6b7ef495b56d..16083eca720e 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -856,4 +856,9 @@ static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma)
return !(vma->vm_flags & VM_SOFTDIRTY);
}
+static inline bool vma_is_shared(const struct vm_area_struct *vma)
+{
+ return vma->vm_flags & VM_SHARED_PT;
+}
+
#endif /* __MM_INTERNAL_H */
--
2.34.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [RFC RESEND PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support
@ 2023-01-20 16:08 ` Khalid Aziz
0 siblings, 0 replies; 8+ messages in thread
From: Khalid Aziz @ 2023-01-20 16:08 UTC (permalink / raw)
To: akpm, willy, djwong, markhemm, viro, david, mike.kravetz
Cc: Khalid Aziz, andreyknvl, dave.hansen, luto, 21cnbao, arnd,
ebiederm, elver, linux-arch, linux-kernel, linux-mm, mhiramat,
rostedt, vasily.averin, xhao
When a process mmaps a file with MAP_SHARED flag, it is possible
that any other processes mmaping the same file with MAP_SHARED
flag with same permissions could share the page table entries as
well instead of creating duplicate entries. This patch introduces a
new flag MAP_SHARED_PT which a process can use to hint that it can
share page atbes with other processes using the same mapping. It
creates a new mm struct to hold the shareable page table entries for
the newly mapped region. This new mm is not associated with a task.
Its lifetime is until the last shared mapping is deleted. It adds a
new pointer "ptshare_data" to struct address_space which points to
the data structure that will contain pointer to this newly created
mm.
Add support for creating a new set of shared page tables in a new
mm_struct upon mmap of an region that can potentially share page
tables. Add page fault handling for this now shared region. Modify
free_pgtables path to make sure page tables in the shared regions
are kept intact when a process using page table region exits and
there are other mappers for the shared region. Clean up mm_struct
holding shared page tables when the last process sharing the region
exits.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
include/linux/fs.h | 1 +
include/uapi/asm-generic/mman-common.h | 1 +
mm/Makefile | 2 +-
mm/internal.h | 16 ++
mm/memory.c | 52 ++++-
mm/mmap.c | 87 ++++++++
mm/ptshare.c | 262 +++++++++++++++++++++++++
7 files changed, 418 insertions(+), 3 deletions(-)
create mode 100644 mm/ptshare.c
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 59ae95ddb679..f940bf03303b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -441,6 +441,7 @@ struct address_space {
spinlock_t private_lock;
struct list_head private_list;
void *private_data;
+ void *ptshare_data;
} __attribute__((aligned(sizeof(long)))) __randomize_layout;
/*
* On most architectures that alignment is already the case; but
diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h
index 6ce1f1ceb432..4d23456b5915 100644
--- a/include/uapi/asm-generic/mman-common.h
+++ b/include/uapi/asm-generic/mman-common.h
@@ -29,6 +29,7 @@
#define MAP_HUGETLB 0x040000 /* create a huge page mapping */
#define MAP_SYNC 0x080000 /* perform synchronous page faults for the mapping */
#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
+#define MAP_SHARED_PT 0x200000 /* Shared page table mappings */
#define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be
* uninitialized */
diff --git a/mm/Makefile b/mm/Makefile
index 8e105e5b3e29..d9bb14fdf220 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -40,7 +40,7 @@ mmu-y := nommu.o
mmu-$(CONFIG_MMU) := highmem.o memory.o mincore.o \
mlock.o mmap.o mmu_gather.o mprotect.o mremap.o \
msync.o page_vma_mapped.o pagewalk.o \
- pgtable-generic.o rmap.o vmalloc.o
+ pgtable-generic.o rmap.o vmalloc.o ptshare.o
ifdef CONFIG_CROSS_MEMORY_ATTACH
diff --git a/mm/internal.h b/mm/internal.h
index 16083eca720e..22cae2ff97fa 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -861,4 +861,20 @@ static inline bool vma_is_shared(const struct vm_area_struct *vma)
return vma->vm_flags & VM_SHARED_PT;
}
+/*
+ * mm/ptshare.c
+ */
+struct mshare_data {
+ struct mm_struct *mm;
+ refcount_t refcnt;
+ unsigned long start;
+ unsigned long size;
+ unsigned long mode;
+};
+int ptshare_new_mm(struct file *file, struct vm_area_struct *vma);
+void ptshare_del_mm(struct vm_area_struct *vm);
+int ptshare_insert_vma(struct mm_struct *mm, struct vm_area_struct *vma);
+extern vm_fault_t find_shared_vma(struct vm_area_struct **vmap,
+ unsigned long *addrp, unsigned int flags);
+
#endif /* __MM_INTERNAL_H */
diff --git a/mm/memory.c b/mm/memory.c
index 8a6d5c823f91..051c82e13627 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -416,15 +416,21 @@ void free_pgtables(struct mmu_gather *tlb, struct maple_tree *mt,
unlink_anon_vmas(vma);
unlink_file_vma(vma);
+ /*
+ * If vma is sharing page tables through a host mm, do not
+ * free page tables for it. Those page tables wil be freed
+ * when host mm is released.
+ */
if (is_vm_hugetlb_page(vma)) {
hugetlb_free_pgd_range(tlb, addr, vma->vm_end,
floor, next ? next->vm_start : ceiling);
- } else {
+ } else if (!vma_is_shared(vma)) {
/*
* Optimization: gather nearby vmas into one call down
*/
while (next && next->vm_start <= vma->vm_end + PMD_SIZE
- && !is_vm_hugetlb_page(next)) {
+ && !is_vm_hugetlb_page(next)
+ && !vma_is_shared(next)) {
vma = next;
next = mas_find(&mas, ceiling - 1);
unlink_anon_vmas(vma);
@@ -5189,6 +5195,8 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
unsigned int flags, struct pt_regs *regs)
{
vm_fault_t ret;
+ bool shared = false;
+ struct mm_struct *orig_mm;
__set_current_state(TASK_RUNNING);
@@ -5198,6 +5206,16 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
/* do counter updates before entering really critical section. */
check_sync_rss_stat(current);
+ orig_mm = vma->vm_mm;
+ if (unlikely(vma_is_shared(vma))) {
+ ret = find_shared_vma(&vma, &address, flags);
+ if (ret)
+ return ret;
+ if (!vma)
+ return VM_FAULT_SIGSEGV;
+ shared = true;
+ }
+
if (!arch_vma_access_permitted(vma, flags & FAULT_FLAG_WRITE,
flags & FAULT_FLAG_INSTRUCTION,
flags & FAULT_FLAG_REMOTE))
@@ -5219,6 +5237,36 @@ vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
lru_gen_exit_fault();
+ /*
+ * Release the read lock on shared VMA's parent mm unless
+ * __handle_mm_fault released the lock already.
+ * __handle_mm_fault sets VM_FAULT_RETRY in return value if
+ * it released mmap lock. If lock was released, that implies
+ * the lock would have been released on task's original mm if
+ * this were not a shared PTE vma. To keep lock state consistent,
+ * make sure to release the lock on task's original mm
+ */
+ if (shared) {
+ int release_mmlock = 1;
+
+ if (!(ret & VM_FAULT_RETRY)) {
+ mmap_read_unlock(vma->vm_mm);
+ release_mmlock = 0;
+ } else if ((flags & FAULT_FLAG_ALLOW_RETRY) &&
+ (flags & FAULT_FLAG_RETRY_NOWAIT)) {
+ mmap_read_unlock(vma->vm_mm);
+ release_mmlock = 0;
+ }
+
+ /*
+ * Reset guest vma pointers that were set up in
+ * find_shared_vma() to process this fault.
+ */
+ vma->vm_mm = orig_mm;
+ if (release_mmlock)
+ mmap_read_unlock(orig_mm);
+ }
+
if (flags & FAULT_FLAG_USER) {
mem_cgroup_exit_user_fault();
/*
diff --git a/mm/mmap.c b/mm/mmap.c
index 74a84eb33b90..c1adb9d52f5d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1245,6 +1245,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
struct mm_struct *mm = current->mm;
vm_flags_t vm_flags;
int pkey = 0;
+ int ptshare = 0;
validate_mm(mm);
*populate = 0;
@@ -1282,6 +1283,21 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
if (mm->map_count > sysctl_max_map_count)
return -ENOMEM;
+ /*
+ * If MAP_SHARED_PT is set, MAP_SHARED or MAP_SHARED_VALIDATE must
+ * be set as well
+ */
+ if (flags & MAP_SHARED_PT) {
+#if VM_SHARED_PT
+ if (flags & (MAP_SHARED | MAP_SHARED_VALIDATE))
+ ptshare = 1;
+ else
+ return -EINVAL;
+#else
+ return -EINVAL;
+#endif
+ }
+
/* Obtain the address to map to. we verify (or select) it and ensure
* that it represents a valid section of the address space.
*/
@@ -1414,6 +1430,60 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
((vm_flags & VM_LOCKED) ||
(flags & (MAP_POPULATE | MAP_NONBLOCK)) == MAP_POPULATE))
*populate = len;
+
+#if VM_SHARED_PT
+ /*
+ * Check if this mapping is a candidate for page table sharing
+ * at PMD level. It is if following conditions hold:
+ * - It is not anonymous mapping
+ * - It is not hugetlbfs mapping (for now)
+ * - flags conatins MAP_SHARED or MAP_SHARED_VALIDATE and
+ * MAP_SHARED_PT
+ * - Start address is aligned to PMD size
+ * - Mapping size is a multiple of PMD size
+ */
+ if (ptshare && file && !is_file_hugepages(file)) {
+ struct vm_area_struct *vma;
+
+ vma = find_vma(mm, addr);
+ if (!((vma->vm_start | vma->vm_end) & (PMD_SIZE - 1))) {
+ struct mshare_data *info = file->f_mapping->ptshare_data;
+
+ /*
+ * If this mapping has not been set up for page table
+ * sharing yet, do so by creating a new mm to hold the
+ * shared page tables for this mapping
+ */
+ if (info == NULL) {
+ int ret;
+
+ ret = ptshare_new_mm(file, vma);
+ if (ret < 0)
+ return ret;
+ info = file->f_mapping->ptshare_data;
+ ret = ptshare_insert_vma(info->mm, vma);
+ if (ret < 0)
+ addr = ret;
+ else
+ vma->vm_flags |= VM_SHARED_PT;
+ } else {
+ /*
+ * Page tables will be shared only if the
+ * file is mapped in with the same permissions
+ * across all mappers with same starting
+ * address and size
+ */
+ if (((prot & info->mode) == info->mode) &&
+ (addr == info->start) &&
+ (len == info->size)) {
+ vma->vm_flags |= VM_SHARED_PT;
+ refcount_inc(&info->refcnt);
+ }
+ }
+ }
+ }
+#endif
+
return addr;
}
@@ -2491,6 +2561,21 @@ int do_mas_munmap(struct ma_state *mas, struct mm_struct *mm,
if (end == start)
return -EINVAL;
+ /*
+ * Check if this vma uses shared page tables
+ */
+ vma = find_vma_intersection(mm, start, end);
+ if (vma && unlikely(vma_is_shared(vma))) {
+ struct mshare_data *info = NULL;
+
+ if (vma->vm_file && vma->vm_file->f_mapping)
+ info = vma->vm_file->f_mapping->ptshare_data;
+ /* Don't allow partial munmaps */
+ if (info && ((start != info->start) || (len != info->size)))
+ return -EINVAL;
+ ptshare_del_mm(vma);
+ }
+
/* arch_unmap() might do unmaps itself. */
arch_unmap(mm, start, end);
@@ -2660,6 +2745,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
}
}
+ if (vm_flags & VM_SHARED_PT)
+ vma->vm_flags |= VM_SHARED_PT;
vm_flags = vma->vm_flags;
} else if (vm_flags & VM_SHARED) {
error = shmem_zero_setup(vma);
diff --git a/mm/ptshare.c b/mm/ptshare.c
new file mode 100644
index 000000000000..97322f822233
--- /dev/null
+++ b/mm/ptshare.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Share page table entries when possible to reduce the amount of extra
+ * memory consumed by page tables
+ *
+ * Copyright (C) 2022 Oracle Corp. All rights reserved.
+ * Authors: Khalid Aziz <khalid.aziz@oracle.com>
+ * Matthew Wilcox <willy@infradead.org>
+ */
+
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <asm/pgalloc.h>
+#include "internal.h"
+
+/*
+ */
+static pmd_t
+*get_pmd(struct mm_struct *mm, unsigned long addr)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset(mm, addr);
+ if (pgd_none(*pgd))
+ return NULL;
+
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d)) {
+ p4d = p4d_alloc(mm, pgd, addr);
+ if (!p4d)
+ return NULL;
+ }
+
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ pud = pud_alloc(mm, p4d, addr);
+ if (!pud)
+ return NULL;
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ pmd = pmd_alloc(mm, pud, addr);
+ if (!pmd)
+ return NULL;
+ }
+
+ return pmd;
+}
+
+/*
+ * Find the shared pmd entries in host mm struct and install them into
+ * guest page tables.
+ */
+static int
+ptshare_copy_pmd(struct mm_struct *host_mm, struct mm_struct *guest_mm,
+ struct vm_area_struct *vma, unsigned long addr)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *host_pmd;
+ spinlock_t *host_ptl, *guest_ptl;
+
+ pgd = pgd_offset(guest_mm, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d)) {
+ p4d = p4d_alloc(guest_mm, pgd, addr);
+ if (!p4d)
+ return 1;
+ }
+
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ host_pmd = get_pmd(host_mm, addr);
+ if (!host_pmd)
+ return 1;
+
+ get_page(virt_to_page(host_pmd));
+ host_ptl = pmd_lockptr(host_mm, host_pmd);
+ guest_ptl = pud_lockptr(guest_mm, pud);
+ spin_lock(host_ptl);
+ spin_lock(guest_ptl);
+ pud_populate(guest_mm, pud,
+ (pmd_t *)((unsigned long)host_pmd & PAGE_MASK));
+ put_page(virt_to_page(host_pmd));
+ spin_unlock(guest_ptl);
+ spin_unlock(host_ptl);
+ }
+
+ return 0;
+}
+
+/*
+ * Find the shared page tables in hosting mm struct and install those in
+ * the guest mm struct
+ */
+vm_fault_t
+find_shared_vma(struct vm_area_struct **vmap, unsigned long *addrp,
+ unsigned int flags)
+{
+ struct mshare_data *info;
+ struct mm_struct *host_mm;
+ struct vm_area_struct *host_vma, *guest_vma = *vmap;
+ unsigned long host_addr;
+ pmd_t *guest_pmd, *host_pmd;
+
+ if ((!guest_vma->vm_file) || (!guest_vma->vm_file->f_mapping))
+ return 0;
+ info = guest_vma->vm_file->f_mapping->ptshare_data;
+ if (!info) {
+ pr_warn("VM_SHARED_PT vma with NULL ptshare_data");
+ dump_stack_print_info(KERN_WARNING);
+ return 0;
+ }
+ host_mm = info->mm;
+
+ mmap_read_lock(host_mm);
+ host_addr = *addrp - guest_vma->vm_start + host_mm->mmap_base;
+ host_pmd = get_pmd(host_mm, host_addr);
+ guest_pmd = get_pmd(guest_vma->vm_mm, *addrp);
+ if (!pmd_same(*guest_pmd, *host_pmd)) {
+ set_pmd(guest_pmd, *host_pmd);
+ mmap_read_unlock(host_mm);
+ return VM_FAULT_NOPAGE;
+ }
+
+ *addrp = host_addr;
+ host_vma = find_vma(host_mm, host_addr);
+ if (!host_vma)
+ return VM_FAULT_SIGSEGV;
+
+ /*
+ * Point vm_mm for the faulting vma to the mm struct holding shared
+ * page tables so the fault handling will happen in the right
+ * shared context
+ */
+ guest_vma->vm_mm = host_mm;
+
+ return 0;
+}
+
+/*
+ * Create a new mm struct that will hold the shared PTEs. Pointer to
+ * this new mm is stored in the data structure mshare_data which also
+ * includes a refcount for any current references to PTEs in this new
+ * mm. This refcount is used to determine when the mm struct for shared
+ * PTEs can be deleted.
+ */
+int
+ptshare_new_mm(struct file *file, struct vm_area_struct *vma)
+{
+ struct mm_struct *new_mm;
+ struct mshare_data *info = NULL;
+ int retval = 0;
+ unsigned long start = vma->vm_start;
+ unsigned long len = vma->vm_end - vma->vm_start;
+
+ new_mm = mm_alloc();
+ if (!new_mm) {
+ retval = -ENOMEM;
+ goto err_free;
+ }
+ new_mm->mmap_base = start;
+ new_mm->task_size = len;
+ if (!new_mm->task_size)
+ new_mm->task_size--;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ retval = -ENOMEM;
+ goto err_free;
+ }
+ info->mm = new_mm;
+ info->start = start;
+ info->size = len;
+ refcount_set(&info->refcnt, 1);
+ file->f_mapping->ptshare_data = info;
+
+ return retval;
+
+err_free:
+ if (new_mm)
+ mmput(new_mm);
+ kfree(info);
+ return retval;
+}
+
+/*
+ * insert vma into mm holding shared page tables
+ */
+int
+ptshare_insert_vma(struct mm_struct *mm, struct vm_area_struct *vma)
+{
+ struct vm_area_struct *new_vma;
+ int err = 0;
+
+ new_vma = vm_area_dup(vma);
+ if (!new_vma)
+ return -ENOMEM;
+
+ new_vma->vm_file = NULL;
+ /*
+ * This new vma belongs to host mm, so clear the VM_SHARED_PT
+ * flag on this so we know this is the host vma when we clean
+ * up page tables. Do not use THP for page table shared regions
+ */
+ new_vma->vm_flags &= ~(VM_SHARED | VM_SHARED_PT);
+ new_vma->vm_flags |= VM_NOHUGEPAGE;
+ new_vma->vm_mm = mm;
+
+ err = insert_vm_struct(mm, new_vma);
+ if (err)
+ return -ENOMEM;
+
+ /*
+ * Copy the PMD entries from host mm to guest so they use the
+ * same PTEs
+ */
+ err = ptshare_copy_pmd(mm, vma->vm_mm, vma, vma->vm_start);
+
+ return err;
+}
+
+/*
+ * Free the mm struct created to hold shared PTEs and associated data
+ * structures
+ */
+static inline void
+free_ptshare_mm(struct mshare_data *info)
+{
+ mmput(info->mm);
+ kfree(info);
+}
+
+/*
+ * This function is called when a reference to the shared PTEs in mm
+ * struct is dropped. It updates refcount and checks to see if last
+ * reference to the mm struct holding shared PTEs has been dropped. If
+ * so, it cleans up the mm struct and associated data structures
+ */
+void
+ptshare_del_mm(struct vm_area_struct *vma)
+{
+ struct mshare_data *info;
+ struct file *file = vma->vm_file;
+
+ if (!file || (!file->f_mapping))
+ return;
+ info = file->f_mapping->ptshare_data;
+ WARN_ON(!info);
+ if (!info)
+ return;
+
+ if (refcount_dec_and_test(&info->refcnt)) {
+ free_ptshare_mm(info);
+ file->f_mapping->ptshare_data = NULL;
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
end of thread, other threads:[~2023-01-20 16:09 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-12-06 15:41 [RFC PATCH 0/2] Add support for sharing page tables across processes (Previously mshare) Khalid Aziz
2023-01-20 16:08 ` [RFC RESEND " Khalid Aziz
2022-12-06 15:41 ` [RFC PATCH 1/2] mm/ptshare: Add vm flag for shared PTE Khalid Aziz
2023-01-20 16:08 ` [RFC RESEND " Khalid Aziz
2022-12-06 15:41 ` [RFC PATCH 2/2] mm/ptshare: Create a new mm for shared pagetables and add basic page table sharing support Khalid Aziz
2023-01-20 16:08 ` [RFC RESEND " Khalid Aziz
2022-12-06 17:47 ` [RFC " kernel test robot
2022-12-06 18:07 ` kernel test robot
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