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| author | Borislav Petkov <bp@suse.de> | 2014-01-18 12:48:15 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2014-03-04 16:17:17 +0000 |
| commit | 11cc851254b4bc3bd4430be8db2a41469303a427 (patch) | |
| tree | 490cfc91f4a07ae31e9cbef87c2a64dad742e2e0 | |
| parent | ef6bea6ddf0e76077d0798e57b374015b23a837e (diff) | |
| download | linux-11cc851254b4bc3bd4430be8db2a41469303a427.tar.gz linux-11cc851254b4bc3bd4430be8db2a41469303a427.tar.bz2 linux-11cc851254b4bc3bd4430be8db2a41469303a427.zip | |
x86/efi: Dump the EFI page table
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>
| -rw-r--r-- | arch/x86/Kconfig.debug | 9 | ||||
| -rw-r--r-- | arch/x86/include/asm/efi.h | 1 | ||||
| -rw-r--r-- | arch/x86/platform/efi/efi.c | 1 | ||||
| -rw-r--r-- | arch/x86/platform/efi/efi_32.c | 1 | ||||
| -rw-r--r-- | arch/x86/platform/efi/efi_64.c | 9 |
5 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 321a52ccf63a..61bd2ad94281 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -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 diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h index a7a8bd89024e..4afd3b3b658f 100644 --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -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; diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c index 876dc5b9e4a3..37f20d71ec4b 100644 --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -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( diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c index 0b74cdf7f816..39496ae3928a 100644 --- a/arch/x86/platform/efi/efi_32.c +++ b/arch/x86/platform/efi/efi_32.c @@ -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) { diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index 0c2a234fef1e..e05c69b46f05 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -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 +} |