linux-kernel - [PATCH] Map in physical addresses in efi_map_region

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Date:	Fri,  5 Aug 2016 18:59:35 -0500
From:	Alex Thorlton <athorlton@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Alex Thorlton <athorlton@....com>, Russ Anderson <rja@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Mike Travis <travis@....com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-efi@...r.kernel.org
Subject: [PATCH] Map in physical addresses in efi_map_region_fixed

This is a simple change to add in the physical mappings as well as the
virtual mappings in efi_map_region_fixed.  The motivation here is to
get access to EFI runtime code that is only available via the 1:1
mappings on a kexec'd kernel.

The added call is essentially the kexec analog of the first __map_region
that Boris put in efi_map_region in commit d2f7cbe7b26a ("x86/efi:
Runtime services virtual mapping").

Signed-off-by: Alex Thorlton <athorlton@....com>
Cc: Russ Anderson <rja@....com>
Cc: Dimitri Sivanich <sivanich@....com>
Cc: Mike Travis <travis@....com>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: linux-efi@...r.kernel.org
---
 arch/x86/platform/efi/efi_64.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index 459bcbb..b206126 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -363,6 +363,7 @@ void __init efi_map_region(efi_memory_desc_t *md)
  */
 void __init efi_map_region_fixed(efi_memory_desc_t *md)
 {
+	__map_region(md, md->phys_addr);
 	__map_region(md, md->virt_addr);
 }
 
-- 
1.8.5.6