From: Borislav Petkov <bp@xxxxxxx>
This is very useful for debugging issues with the recently added
pagetable switching code for EFI virtual mode.
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/platform/efi/efi.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 7d8caccbf2f3..51d6285701e9 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -740,6 +740,15 @@ void efi_memory_uc(u64 addr, unsigned long size)
set_memory_uc(addr, npages);
}
+static void efi_dump_pagetable(void)
+{
+#if defined(EFI_DEBUG) && defined(CONFIG_X86_PTDUMP)
+ pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
+
+ walk_pgd_level(NULL, pgd);
+#endif
+}
+
void __init old_map_region(efi_memory_desc_t *md)
{
u64 start_pfn, end_pfn, end;
@@ -869,6 +878,8 @@ void __init efi_enter_virtual_mode(void)
efi_setup_page_tables();
efi_sync_low_kernel_mappings();
+ efi_dump_pagetable();
+
status = phys_efi_set_virtual_address_map(
memmap.desc_size * count,
memmap.desc_size,
--
1.8.4
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