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author | Sai Praneeth <sai.praneeth.prakhya@intel.com> | 2017-06-02 13:52:06 +0000 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-06-05 17:50:43 +0200 |
commit | ac81d3de03f7d8593a94240d057c8e2e8e869897 (patch) | |
tree | 69e84000abcc273e186046c16f703060dc2d0fbd /arch/x86/platform/efi/efi_32.c | |
parent | 5f72cad65cfaac5e40d0de8b7f48ee647af69cd5 (diff) | |
download | op-kernel-dev-ac81d3de03f7d8593a94240d057c8e2e8e869897.zip op-kernel-dev-ac81d3de03f7d8593a94240d057c8e2e8e869897.tar.gz |
x86/efi: Extend CONFIG_EFI_PGT_DUMP support to x86_32 and kexec as well
CONFIG_EFI_PGT_DUMP=y, as the name suggests, dumps EFI page tables to the
kernel log during kernel boot.
This feature is very useful while debugging page faults/null pointer
dereferences to EFI related addresses.
Presently, this feature is limited only to x86_64, so let's extend it to
other EFI configurations like kexec kernel, efi=old_map and to x86_32 as well.
This doesn't effect normal boot path because this config option should
be used only for debug purposes.
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: Ricardo Neri <ricardo.neri@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170602135207.21708-13-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/platform/efi/efi_32.c')
-rw-r--r-- | arch/x86/platform/efi/efi_32.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c index 3481268..52f7faa 100644 --- a/arch/x86/platform/efi/efi_32.c +++ b/arch/x86/platform/efi/efi_32.c @@ -44,7 +44,14 @@ int __init efi_alloc_page_tables(void) } void efi_sync_low_kernel_mappings(void) {} -void __init efi_dump_pagetable(void) {} + +void __init efi_dump_pagetable(void) +{ +#ifdef CONFIG_EFI_PGT_DUMP + ptdump_walk_pgd_level(NULL, swapper_pg_dir); +#endif +} + int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) { return 0; |