Commit-ID: 8266e31ed0fedb7ee16ebc86e80468f7cc1bbb4e
Gitweb: http://git.kernel.org/tip/8266e31ed0fedb7ee16ebc86e80468f7cc1bbb4e
Author: Mathias Krause <minipli@xxxxxxxxxxxxxx>
AuthorDate: Sun, 21 Sep 2014 17:26:54 +0200
Committer: Matt Fleming <matt.fleming@xxxxxxxxx>
CommitDate: Tue, 11 Nov 2014 22:28:57 +0000
x86, ptdump: Add section for EFI runtime services
In commit 3891a04aafd6 ("x86-64, espfix: Don't leak bits 31:16 of %esp
returning..") the "ESPFix Area" was added to the page table dump special
sections. That area, though, has a limited amount of entries printed.
The EFI runtime services are, unfortunately, located in-between the
espfix area and the high kernel memory mapping. Due to the enforced
limitation for the espfix area, the EFI mappings won't be printed in the
page table dump.
To make the ESP runtime service mappings visible again, provide them a
dedicated entry.
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Acked-by: Borislav Petkov <bp@xxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
---
arch/x86/include/asm/pgtable_64_types.h | 2 ++
arch/x86/mm/dump_pagetables.c | 3 +++
arch/x86/platform/efi/efi_64.c | 3 +--
3 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 7166e25..602b602 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -63,6 +63,8 @@ typedef struct { pteval_t pte; } pte_t;
#define MODULES_LEN (MODULES_END - MODULES_VADDR)
#define ESPFIX_PGD_ENTRY _AC(-2, UL)
#define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << PGDIR_SHIFT)
+#define EFI_VA_START ( -4 * (_AC(1, UL) << 30))
+#define EFI_VA_END (-68 * (_AC(1, UL) << 30))
#define EARLY_DYNAMIC_PAGE_TABLES 64
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 95a427e..1a8053d 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -76,6 +76,9 @@ static struct addr_marker address_markers[] = {
# ifdef CONFIG_X86_ESPFIX64
{ ESPFIX_BASE_ADDR, "ESPfix Area", 16 },
# endif
+# ifdef CONFIG_EFI
+ { EFI_VA_END, "EFI Runtime Services" },
+# endif
{ __START_KERNEL_map, "High Kernel Mapping" },
{ MODULES_VADDR, "Modules" },
{ MODULES_END, "End Modules" },
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index 35aecb6..17e80d8 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -48,8 +48,7 @@ static unsigned long efi_flags __initdata;
* We allocate runtime services regions bottom-up, starting from -4G, i.e.
* 0xffff_ffff_0000_0000 and limit EFI VA mapping space to 64G.
*/
-static u64 efi_va = -4 * (1UL << 30);
-#define EFI_VA_END (-68 * (1UL << 30))
+static u64 efi_va = EFI_VA_START;
/*
* Scratch space used for switching the pagetable in the EFI stub
--
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