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x86/efi: Dump the EFI page table

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This is very useful for debugging issues with the recently added
pagetable switching code for EFI virtual mode.

Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov 2014-01-18 12:48:15 +01:00 committed by Matt Fleming
parent ef6bea6ddf
commit 11cc851254
5 changed files with 21 additions and 0 deletions
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9
arch/x86/Kconfig.debug
View File

@ -81,6 +81,15 @@ config X86_PTDUMP
kernel.
If in doubt, say "N"
config EFI_PGT_DUMP
bool "Dump the EFI pagetable"
depends on EFI && X86_PTDUMP
---help---
Enable this if you want to dump the EFI page table before
enabling virtual mode. This can be used to debug miscellaneous
issues with the mapping of the EFI runtime regions into that
table.
config DEBUG_RODATA
bool "Write protect kernel read-only data structures"
default y

1
arch/x86/include/asm/efi.h
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@ -133,6 +133,7 @@ extern void efi_setup_page_tables(void);
extern void __init old_map_region(efi_memory_desc_t *md);
extern void __init runtime_code_page_mkexec(void);
extern void __init efi_runtime_mkexec(void);
extern void __init efi_dump_pagetable(void);
struct efi_setup_data {
u64 fw_vendor;

1
arch/x86/platform/efi/efi.c
View File

@ -1021,6 +1021,7 @@ void __init efi_enter_virtual_mode(void)
efi_setup_page_tables();
efi_sync_low_kernel_mappings();
efi_dump_pagetable();
if (!efi_setup) {
status = phys_efi_set_virtual_address_map(

1
arch/x86/platform/efi/efi_32.c
View File

@ -41,6 +41,7 @@ static unsigned long efi_rt_eflags;
void efi_sync_low_kernel_mappings(void) {}
void efi_setup_page_tables(void) {}
void __init efi_dump_pagetable(void) {}
void __init efi_map_region(efi_memory_desc_t *md)
{

9
arch/x86/platform/efi/efi_64.c
View File

@ -242,3 +242,12 @@ void __init efi_runtime_mkexec(void)
if (__supported_pte_mask & _PAGE_NX)
runtime_code_page_mkexec();
}
void __init efi_dump_pagetable(void)
{
#ifdef CONFIG_EFI_PGT_DUMP
pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
ptdump_walk_pgd_level(NULL, pgd);
#endif
}