From 11cc851254b4bc3bd4430be8db2a41469303a427 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Sat, 18 Jan 2014 12:48:15 +0100 Subject: 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 Tested-by: Toshi Kani Signed-off-by: Matt Fleming --- arch/x86/platform/efi/efi.c | 1 + arch/x86/platform/efi/efi_32.c | 1 + arch/x86/platform/efi/efi_64.c | 9 +++++++++ 3 files changed, 11 insertions(+) (limited to 'arch/x86/platform/efi') 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 +} -- cgit v1.2.1