x86, ptdump: Add section for EFI runtime services

In commit 3891a04 ("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 <[email protected]> Acked-by: Borislav Petkov <[email protected]> Cc: H. Peter Anvin <[email protected]> Signed-off-by: Matt Fleming <[email protected]>
thoughtpolice · Nov 11, 2014 · 8266e31 · 8266e31
1 parent 243b675
commit 8266e31
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Showing 3 changed files with 6 additions and 2 deletions.
diff --git 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
@@ -75,6 +75,9 @@ static struct addr_marker address_markers[] = {
 	{ VMEMMAP_START,        "Vmemmap" },
 # 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" },

diff --git 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