linux-kernel - [PATCH 2/3] efi: Dump the EFI page table

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Date:	Tue, 17 Dec 2013 00:36:36 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Linux EFI <linux-efi@...r.kernel.org>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	Borislav Petkov <bp@...e.de>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Young <dyoung@...hat.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Toshi Kani <toshi.kani@...com>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: [PATCH 2/3] efi: Dump the EFI page table

From: Borislav Petkov <bp@...e.de>

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

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 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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