* [PATCH v2 1/3] x86/mm: disable ioremap free page handling on x86-PAE
2018-05-15 21:39 [PATCH v2 0/3] fix free pmd/pte page handlings on x86 Toshi Kani
@ 2018-05-15 21:39 ` Toshi Kani
2018-05-16 11:00 ` kbuild test robot
2018-05-15 21:39 ` [PATCH v2 2/3] ioremap: Update pgtable free interfaces with addr Toshi Kani
2018-05-15 21:39 ` [PATCH v2 3/3] x86/mm: add TLB purge to free pmd/pte page interfaces Toshi Kani
2 siblings, 1 reply; 6+ messages in thread
From: Toshi Kani @ 2018-05-15 21:39 UTC (permalink / raw)
To: mhocko, akpm, tglx, mingo, hpa
Cc: cpandya, linux-mm, x86, linux-arm-kernel, linux-kernel,
Toshi Kani, Joerg Roedel, stable
ioremap() supports pmd mappings on x86-PAE. However, kernel's pmd
tables are not shared among processes on x86-PAE. Therefore, any
update to sync'd pmd entries need re-syncing. Freeing a pte page
also leads to a vmalloc fault and hits the BUG_ON in vmalloc_sync_one().
Disable free page handling on x86-PAE. pud_free_pmd_page() and
pmd_free_pte_page() simply return 0 if a given pud/pmd entry is present.
This assures that ioremap() does not update sync'd pmd entries at the
cost of falling back to pte mappings.
Fixes: 28ee90fe6048 ("x86/mm: implement free pmd/pte page interfaces")
Reported-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: <stable@vger.kernel.org>
---
arch/x86/mm/pgtable.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index ffc8c13c50e4..08cdd7c13619 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -715,6 +715,7 @@ int pmd_clear_huge(pmd_t *pmd)
return 0;
}
+#ifdef CONFIG_X86_64
/**
* pud_free_pmd_page - Clear pud entry and free pmd page.
* @pud: Pointer to a PUD.
@@ -762,4 +763,22 @@ int pmd_free_pte_page(pmd_t *pmd)
return 1;
}
+
+#else /* !CONFIG_X86_64 */
+
+int pud_free_pmd_page(pud_t *pud, unsigned long addr)
+{
+ return pud_none(*pud);
+}
+
+/*
+ * Disable free page handling on x86-PAE. This assures that ioremap()
+ * does not update sync'd pmd entries. See vmalloc_sync_one().
+ */
+int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
+{
+ return pmd_none(*pmd);
+}
+
+#endif /* CONFIG_X86_64 */
#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 2/3] ioremap: Update pgtable free interfaces with addr
2018-05-15 21:39 [PATCH v2 0/3] fix free pmd/pte page handlings on x86 Toshi Kani
2018-05-15 21:39 ` [PATCH v2 1/3] x86/mm: disable ioremap free page handling on x86-PAE Toshi Kani
@ 2018-05-15 21:39 ` Toshi Kani
2018-05-15 21:39 ` [PATCH v2 3/3] x86/mm: add TLB purge to free pmd/pte page interfaces Toshi Kani
2 siblings, 0 replies; 6+ messages in thread
From: Toshi Kani @ 2018-05-15 21:39 UTC (permalink / raw)
To: mhocko, akpm, tglx, mingo, hpa
Cc: cpandya, linux-mm, x86, linux-arm-kernel, linux-kernel,
Toshi Kani, stable
From: Chintan Pandya <cpandya@codeaurora.org>
This patch ("mm/vmalloc: Add interfaces to free unmapped
page table") adds following 2 interfaces to free the page
table in case we implement huge mapping.
pud_free_pmd_page() and pmd_free_pte_page()
Some architectures (like arm64) needs to do proper TLB
maintanance after updating pagetable entry even in map.
Why ? Read this,
https://patchwork.kernel.org/patch/10134581/
Pass 'addr' in these interfaces so that proper TLB ops
can be performed.
Fixes: 28ee90fe6048 ("x86/mm: implement free pmd/pte page interfaces")
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: <stable@vger.kernel.org>
---
arch/arm64/mm/mmu.c | 4 ++--
arch/x86/mm/pgtable.c | 8 +++++---
include/asm-generic/pgtable.h | 8 ++++----
lib/ioremap.c | 4 ++--
4 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 2dbb2c9f1ec1..da98828609a1 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -973,12 +973,12 @@ int pmd_clear_huge(pmd_t *pmdp)
return 1;
}
-int pud_free_pmd_page(pud_t *pud)
+int pud_free_pmd_page(pud_t *pud, unsigned long addr)
{
return pud_none(*pud);
}
-int pmd_free_pte_page(pmd_t *pmd)
+int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
{
return pmd_none(*pmd);
}
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 08cdd7c13619..f60fdf411103 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -719,11 +719,12 @@ int pmd_clear_huge(pmd_t *pmd)
/**
* pud_free_pmd_page - Clear pud entry and free pmd page.
* @pud: Pointer to a PUD.
+ * @addr: Virtual address associated with pud.
*
* Context: The pud range has been unmaped and TLB purged.
* Return: 1 if clearing the entry succeeded. 0 otherwise.
*/
-int pud_free_pmd_page(pud_t *pud)
+int pud_free_pmd_page(pud_t *pud, unsigned long addr)
{
pmd_t *pmd;
int i;
@@ -734,7 +735,7 @@ int pud_free_pmd_page(pud_t *pud)
pmd = (pmd_t *)pud_page_vaddr(*pud);
for (i = 0; i < PTRS_PER_PMD; i++)
- if (!pmd_free_pte_page(&pmd[i]))
+ if (!pmd_free_pte_page(&pmd[i], addr + (i * PMD_SIZE)))
return 0;
pud_clear(pud);
@@ -746,11 +747,12 @@ int pud_free_pmd_page(pud_t *pud)
/**
* pmd_free_pte_page - Clear pmd entry and free pte page.
* @pmd: Pointer to a PMD.
+ * @addr: Virtual address associated with pmd.
*
* Context: The pmd range has been unmaped and TLB purged.
* Return: 1 if clearing the entry succeeded. 0 otherwise.
*/
-int pmd_free_pte_page(pmd_t *pmd)
+int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
{
pte_t *pte;
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index f59639afaa39..b081794ba135 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -1019,8 +1019,8 @@ int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot);
int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot);
int pud_clear_huge(pud_t *pud);
int pmd_clear_huge(pmd_t *pmd);
-int pud_free_pmd_page(pud_t *pud);
-int pmd_free_pte_page(pmd_t *pmd);
+int pud_free_pmd_page(pud_t *pud, unsigned long addr);
+int pmd_free_pte_page(pmd_t *pmd, unsigned long addr);
#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
static inline int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
{
@@ -1046,11 +1046,11 @@ static inline int pmd_clear_huge(pmd_t *pmd)
{
return 0;
}
-static inline int pud_free_pmd_page(pud_t *pud)
+static inline int pud_free_pmd_page(pud_t *pud, unsigned long addr)
{
return 0;
}
-static inline int pmd_free_pte_page(pmd_t *pmd)
+static inline int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
{
return 0;
}
diff --git a/lib/ioremap.c b/lib/ioremap.c
index 54e5bbaa3200..517f5853ffed 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -92,7 +92,7 @@ static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
if (ioremap_pmd_enabled() &&
((next - addr) == PMD_SIZE) &&
IS_ALIGNED(phys_addr + addr, PMD_SIZE) &&
- pmd_free_pte_page(pmd)) {
+ pmd_free_pte_page(pmd, addr)) {
if (pmd_set_huge(pmd, phys_addr + addr, prot))
continue;
}
@@ -119,7 +119,7 @@ static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr,
if (ioremap_pud_enabled() &&
((next - addr) == PUD_SIZE) &&
IS_ALIGNED(phys_addr + addr, PUD_SIZE) &&
- pud_free_pmd_page(pud)) {
+ pud_free_pmd_page(pud, addr)) {
if (pud_set_huge(pud, phys_addr + addr, prot))
continue;
}
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v2 3/3] x86/mm: add TLB purge to free pmd/pte page interfaces
2018-05-15 21:39 [PATCH v2 0/3] fix free pmd/pte page handlings on x86 Toshi Kani
2018-05-15 21:39 ` [PATCH v2 1/3] x86/mm: disable ioremap free page handling on x86-PAE Toshi Kani
2018-05-15 21:39 ` [PATCH v2 2/3] ioremap: Update pgtable free interfaces with addr Toshi Kani
@ 2018-05-15 21:39 ` Toshi Kani
2 siblings, 0 replies; 6+ messages in thread
From: Toshi Kani @ 2018-05-15 21:39 UTC (permalink / raw)
To: mhocko, akpm, tglx, mingo, hpa
Cc: cpandya, linux-mm, x86, linux-arm-kernel, linux-kernel,
Toshi Kani, Joerg Roedel, stable
ioremap() calls pud_free_pmd_page() / pmd_free_pte_page() when it creates
a pud / pmd map. The following preconditions are met at their entry.
- All pte entries for a target pud/pmd address range have been cleared.
- System-wide TLB purges have been peformed for a target pud/pmd address
range.
The preconditions assure that there is no stale TLB entry for the range.
Speculation may not cache TLB entries since it requires all levels of page
entries, including ptes, to have P & A-bits set for an associated address.
However, speculation may cache pud/pmd entries (paging-structure caches)
when they have P-bit set.
Add a system-wide TLB purge (INVLPG) to a single page after clearing
pud/pmd entry's P-bit.
SDM 4.10.4.1, Operation that Invalidate TLBs and Paging-Structure Caches,
states that:
INVLPG invalidates all paging-structure caches associated with the
current PCID regardless of the liner addresses to which they correspond.
Fixes: 28ee90fe6048 ("x86/mm: implement free pmd/pte page interfaces")
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: <stable@vger.kernel.org>
---
arch/x86/mm/pgtable.c | 34 ++++++++++++++++++++++++++++------
1 file changed, 28 insertions(+), 6 deletions(-)
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index f60fdf411103..7e96594c7e97 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -721,24 +721,42 @@ int pmd_clear_huge(pmd_t *pmd)
* @pud: Pointer to a PUD.
* @addr: Virtual address associated with pud.
*
- * Context: The pud range has been unmaped and TLB purged.
+ * Context: The pud range has been unmapped and TLB purged.
* Return: 1 if clearing the entry succeeded. 0 otherwise.
*/
int pud_free_pmd_page(pud_t *pud, unsigned long addr)
{
- pmd_t *pmd;
+ pmd_t *pmd, *pmd_sv;
+ pte_t *pte;
int i;
if (pud_none(*pud))
return 1;
pmd = (pmd_t *)pud_page_vaddr(*pud);
+ pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
+ if (!pmd_sv)
+ return 0;
- for (i = 0; i < PTRS_PER_PMD; i++)
- if (!pmd_free_pte_page(&pmd[i], addr + (i * PMD_SIZE)))
- return 0;
+ for (i = 0; i < PTRS_PER_PMD; i++) {
+ pmd_sv[i] = pmd[i];
+ if (!pmd_none(pmd[i]))
+ pmd_clear(&pmd[i]);
+ }
pud_clear(pud);
+
+ /* INVLPG to clear all paging-structure caches */
+ flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);
+
+ for (i = 0; i < PTRS_PER_PMD; i++) {
+ if (!pmd_none(pmd_sv[i])) {
+ pte = (pte_t *)pmd_page_vaddr(pmd_sv[i]);
+ free_page((unsigned long)pte);
+ }
+ }
+
+ free_page((unsigned long)pmd_sv);
free_page((unsigned long)pmd);
return 1;
@@ -749,7 +767,7 @@ int pud_free_pmd_page(pud_t *pud, unsigned long addr)
* @pmd: Pointer to a PMD.
* @addr: Virtual address associated with pmd.
*
- * Context: The pmd range has been unmaped and TLB purged.
+ * Context: The pmd range has been unmapped and TLB purged.
* Return: 1 if clearing the entry succeeded. 0 otherwise.
*/
int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
@@ -761,6 +779,10 @@ int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
pte = (pte_t *)pmd_page_vaddr(*pmd);
pmd_clear(pmd);
+
+ /* INVLPG to clear all paging-structure caches */
+ flush_tlb_kernel_range(addr, addr + PAGE_SIZE-1);
+
free_page((unsigned long)pte);
return 1;
^ permalink raw reply related [flat|nested] 6+ messages in thread