[PATCH v7 07/12] x86/efi: Add efi_fake_mem support for EFI_MEMORY_SP

Dan Williams
2019-10-16T01:14:25Z

Given that EFI_MEMORY_SP is platform BIOS policy decision for marking
memory ranges as "reserved for a specific purpose" there will inevitably
be scenarios where the BIOS omits the attribute in situations where it
is desired. Unlike other attributes if the OS wants to reserve this
memory from the kernel the reservation needs to happen early in init. So
early, in fact, that it needs to happen before e820__memblock_setup()
which is a pre-requisite for efi_fake_memmap() that wants to allocate
memory for the updated table.

Introduce an x86 specific efi_fake_memmap_early() that can search for
attempts to set EFI_MEMORY_SP via efi_fake_mem and update the e820 table
accordingly.

The KASLR code that scans the command line looking for user-directed
memory reservations also needs to be updated to consider
"efi_fake_mem=nn@ss:0x40000" requests.

Cc: <x86@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
Documentation/admin-guide/kernel-parameters.txt | 10 +++
arch/x86/boot/compressed/kaslr.c | 42 ++++++++++++--
arch/x86/include/asm/efi.h | 8 +++
arch/x86/platform/efi/efi.c | 2 +
drivers/firmware/efi/Makefile | 5 +-
drivers/firmware/efi/fake_mem.c | 24 ++++----
drivers/firmware/efi/fake_mem.h | 10 +++
drivers/firmware/efi/x86_fake_mem.c | 69 +++++++++++++++++++++++
8 files changed, 147 insertions(+), 23 deletions(-)
create mode 100644 drivers/firmware/efi/fake_mem.h
create mode 100644 drivers/firmware/efi/x86_fake_mem.c

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 47478a730011..9489d76b0e9f 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1196,15 +1196,21 @@
updating original EFI memory map.
Region of memory which aa attribute is added to is
from ss to ss+nn.
+
If efi_fake_mem=2G@4G:0x10000,2G@0x10a0000000:0x10000
is specified, EFI_MEMORY_MORE_RELIABLE(0x10000)
attribute is added to range 0x100000000-0x180000000 and
0x10a0000000-0x1120000000.

+ If efi_fake_mem=8G@9G:0x40000 is specified, the
+ EFI_MEMORY_SP(0x40000) attribute is added to
+ range 0x240000000-0x43fffffff.
+
Using this parameter you can do debugging of EFI memmap
- related feature. For example, you can do debugging of
+ related features. For example, you can do debugging of
Address Range Mirroring feature even if your box
- doesn't support it.
+ doesn't support it, or mark specific memory as
+ "soft reserved".

efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
that is to be dynamically loaded by Linux. If there are
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index ff6fa81949cd..da0eedd5635d 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -132,8 +132,14 @@ char *skip_spaces(const char *str)
#include "../../../../lib/ctype.c"
#include "../../../../lib/cmdline.c"

+enum parse_mode {
+ PARSE_MEMMAP,
+ PARSE_EFI,
+};
+
static int
-parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
+parse_memmap(char *p, unsigned long long *start, unsigned long long *size,
+ enum parse_mode mode)
{
char *oldp;

@@ -156,8 +162,29 @@ parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
*start = memparse(p + 1, &p);
return 0;
case '@':
- /* memmap=nn@ss specifies usable region, should be skipped */
- *size = 0;
+ if (mode == PARSE_MEMMAP) {
+ /*
+ * memmap=nn@ss specifies usable region, should
+ * be skipped
+ */
+ *size = 0;
+ } else {
+ unsigned long long flags;
+
+ /*
+ * efi_fake_mem=nn@ss:attr the attr specifies
+ * flags that might imply a soft-reservation.
+ */
+ *start = memparse(p + 1, &p);
+ if (p && *p == ':') {
+ p++;
+ if (kstrtoull(p, 0, &flags) < 0)
+ *size = 0;
+ else if (flags & EFI_MEMORY_SP)
+ return 0;
+ }
+ *size = 0;
+ }
/* Fall through */
default:
/*
@@ -172,7 +199,7 @@ parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
return -EINVAL;
}

-static void mem_avoid_memmap(char *str)
+static void mem_avoid_memmap(enum parse_mode mode, char *str)
{
static int i;

@@ -187,7 +214,7 @@ static void mem_avoid_memmap(char *str)
if (k)
*k++ = 0;

- rc = parse_memmap(str, &start, &size);
+ rc = parse_memmap(str, &start, &size, mode);
if (rc < 0)
break;
str = k;
@@ -238,7 +265,6 @@ static void parse_gb_huge_pages(char *param, char *val)
}
}

-
static void handle_mem_options(void)
{
char *args = (char *)get_cmd_line_ptr();
@@ -271,7 +297,7 @@ static void handle_mem_options(void)
}

if (!strcmp(param, "memmap")) {
- mem_avoid_memmap(val);
+ mem_avoid_memmap(PARSE_MEMMAP, val);
} else if (strstr(param, "hugepages")) {
parse_gb_huge_pages(param, val);
} else if (!strcmp(param, "mem")) {
@@ -284,6 +310,8 @@ static void handle_mem_options(void)
goto out;

mem_limit = mem_size;
+ } else if (!strcmp(param, "efi_fake_mem")) {
+ mem_avoid_memmap(PARSE_EFI, val);
}
}

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 45f853bce869..d028e9acdf1c 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -263,4 +263,12 @@ static inline void efi_reserve_boot_services(void)
}
#endif /* CONFIG_EFI */

+#ifdef CONFIG_EFI_FAKE_MEMMAP
+extern void __init efi_fake_memmap_early(void);
+#else
+static inline void efi_fake_memmap_early(void)
+{
+}
+#endif
+
#endif /* _ASM_X86_EFI_H */
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 0336d481b826..6b761f38a215 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -262,6 +262,8 @@ int __init efi_memblock_x86_reserve_range(void)
if (add_efi_memmap || do_efi_soft_reserve())
do_add_efi_memmap();

+ efi_fake_memmap_early();
+
WARN(efi.memmap.desc_version != 1,
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
efi.memmap.desc_version);
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index 4ac2de4dfa72..554d795270d9 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -20,13 +20,16 @@ obj-$(CONFIG_UEFI_CPER) += cper.o
obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o
obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o
obj-$(CONFIG_EFI_STUB) += libstub/
-obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o
+obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_map.o
obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
obj-$(CONFIG_EFI_TEST) += test/
obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o
obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o
obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o

+fake_map-y += fake_mem.o
+fake_map-$(CONFIG_X86) += x86_fake_mem.o
+
arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o
obj-$(CONFIG_ARM) += $(arm-obj-y)
obj-$(CONFIG_ARM64) += $(arm-obj-y)
diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c
index 526b45331d96..bb9fc70d0cfa 100644
--- a/drivers/firmware/efi/fake_mem.c
+++ b/drivers/firmware/efi/fake_mem.c
@@ -17,12 +17,10 @@
#include <linux/memblock.h>
#include <linux/types.h>
#include <linux/sort.h>
-#include <asm/efi.h>
+#include "fake_mem.h"

-#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM
-
-static struct efi_mem_range fake_mems[EFI_MAX_FAKEMEM];
-static int nr_fake_mem;
+struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM];
+int nr_fake_mem;

static int __init cmp_fake_mem(const void *x1, const void *x2)
{
@@ -50,7 +48,7 @@ void __init efi_fake_memmap(void)
/* count up the number of EFI memory descriptor */
for (i = 0; i < nr_fake_mem; i++) {
for_each_efi_memory_desc(md) {
- struct range *r = &fake_mems[i].range;
+ struct range *r = &efi_fake_mems[i].range;

new_nr_map += efi_memmap_split_count(md, r);
}
@@ -70,7 +68,7 @@ void __init efi_fake_memmap(void)
}

for (i = 0; i < nr_fake_mem; i++)
- efi_memmap_insert(&efi.memmap, new_memmap, &fake_mems[i]);
+ efi_memmap_insert(&efi.memmap, new_memmap, &efi_fake_mems[i]);

/* swap into new EFI memmap */
early_memunmap(new_memmap, efi.memmap.desc_size * new_nr_map);
@@ -104,22 +102,22 @@ static int __init setup_fake_mem(char *p)
if (nr_fake_mem >= EFI_MAX_FAKEMEM)
break;

- fake_mems[nr_fake_mem].range.start = start;
- fake_mems[nr_fake_mem].range.end = start + mem_size - 1;
- fake_mems[nr_fake_mem].attribute = attribute;
+ efi_fake_mems[nr_fake_mem].range.start = start;
+ efi_fake_mems[nr_fake_mem].range.end = start + mem_size - 1;
+ efi_fake_mems[nr_fake_mem].attribute = attribute;
nr_fake_mem++;

if (*p == ',')
p++;
}

- sort(fake_mems, nr_fake_mem, sizeof(struct efi_mem_range),
+ sort(efi_fake_mems, nr_fake_mem, sizeof(struct efi_mem_range),
cmp_fake_mem, NULL);

for (i = 0; i < nr_fake_mem; i++)
pr_info("efi_fake_mem: add attr=0x%016llx to [mem 0x%016llx-0x%016llx]",
- fake_mems[i].attribute, fake_mems[i].range.start,
- fake_mems[i].range.end);
+ efi_fake_mems[i].attribute, efi_fake_mems[i].range.start,
+ efi_fake_mems[i].range.end);

return *p == '\0' ? 0 : -EINVAL;
}
diff --git a/drivers/firmware/efi/fake_mem.h b/drivers/firmware/efi/fake_mem.h
new file mode 100644
index 000000000000..d52791af4b18
--- /dev/null
+++ b/drivers/firmware/efi/fake_mem.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __EFI_FAKE_MEM_H__
+#define __EFI_FAKE_MEM_H__
+#include <asm/efi.h>
+
+#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM
+
+extern struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM];
+extern int nr_fake_mem;
+#endif /* __EFI_FAKE_MEM_H__ */
diff --git a/drivers/firmware/efi/x86_fake_mem.c b/drivers/firmware/efi/x86_fake_mem.c
new file mode 100644
index 000000000000..e5d6d5a1b240
--- /dev/null
+++ b/drivers/firmware/efi/x86_fake_mem.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2019 Intel Corporation. All rights reserved. */
+#include <linux/efi.h>
+#include <asm/e820/api.h>
+#include "fake_mem.h"
+
+void __init efi_fake_memmap_early(void)
+{
+ int i;
+
+ /*
+ * The late efi_fake_mem() call can handle all requests if
+ * EFI_MEMORY_SP support is disabled.
+ */
+ if (!efi_soft_reserve_enabled())
+ return;
+
+ if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem)
+ return;
+
+ /*
+ * Given that efi_fake_memmap() needs to perform memblock
+ * allocations it needs to run after e820__memblock_setup().
+ * However, if efi_fake_mem specifies EFI_MEMORY_SP for a given
+ * address range that potentially needs to mark the memory as
+ * reserved prior to e820__memblock_setup(). Update e820
+ * directly if EFI_MEMORY_SP is specified for an
+ * EFI_CONVENTIONAL_MEMORY descriptor.
+ */
+ for (i = 0; i < nr_fake_mem; i++) {
+ struct efi_mem_range *mem = &efi_fake_mems[i];
+ efi_memory_desc_t *md;
+ u64 m_start, m_end;
+
+ if ((mem->attribute & EFI_MEMORY_SP) == 0)
+ continue;
+
+ m_start = mem->range.start;
+ m_end = mem->range.end;
+ for_each_efi_memory_desc(md) {
+ u64 start, end;
+
+ if (md->type != EFI_CONVENTIONAL_MEMORY)
+ continue;
+
+ start = md->phys_addr;
+ end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
+
+ if (m_start <= end && m_end >= start)
+ /* fake range overlaps descriptor */;
+ else
+ continue;
+
+ /*
+ * Trim the boundary of the e820 update to the
+ * descriptor in case the fake range overlaps
+ * !EFI_CONVENTIONAL_MEMORY
+ */
+ start = max(start, m_start);
+ end = min(end, m_end);
+
+ if (end <= start)
+ continue;
+ e820__range_update(start, end - start + 1, E820_TYPE_RAM,
+ E820_TYPE_SOFT_RESERVED);
+ e820__update_table(e820_table);
+ }
+ }
+}