linux-kernel - [RFC PATCH v1 12/18] x86: Access device tree in the clear

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Date:	Tue, 26 Apr 2016 17:58:00 -0500
From:	Tom Lendacky <thomas.lendacky@....com>
To:	<linux-arch@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
	<iommu@...ts.linux-foundation.org>
CC:	Radim Krčmář <rkrcmar@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Jonathan Corbet <corbet@....net>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Joerg Roedel <joro@...tes.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Ingo Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	"Alexander Potapenko" <glider@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Dmitry Vyukov" <dvyukov@...gle.com>
Subject: [RFC PATCH v1 12/18] x86: Access device tree in the clear

The device tree is not encrypted and needs to be accessed as such. Be sure
to memmap it without the encryption mask set.

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 arch/x86/kernel/devicetree.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 3fe45f8..ff11f7a 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -22,6 +22,7 @@
 #include <asm/pci_x86.h>
 #include <asm/setup.h>
 #include <asm/i8259.h>
+#include <asm/mem_encrypt.h>
 
 __initdata u64 initial_dtb;
 char __initdata cmd_line[COMMAND_LINE_SIZE];
@@ -276,11 +277,12 @@ static void __init x86_flattree_get_config(void)
 
 	map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
 
-	initial_boot_params = dt = early_memremap(initial_dtb, map_len);
+	initial_boot_params = dt = sme_early_memremap(initial_dtb, map_len);
 	size = of_get_flat_dt_size();
 	if (map_len < size) {
 		early_memunmap(dt, map_len);
-		initial_boot_params = dt = early_memremap(initial_dtb, size);
+		initial_boot_params = dt = sme_early_memremap(initial_dtb,
+							      size);
 		map_len = size;
 	}