linux-kernel - [PATCH 3.12 112/170] KVM: x86: preserve the high 32-bits of the PAT register

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Date:	Fri, 18 Jul 2014 14:11:57 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 112/170] KVM: x86: preserve the high 32-bits of the PAT register

From: Paolo Bonzini <pbonzini@...hat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 7cb060a91c0efc5ff94f83c6df3ed705e143cdb9 upstream.

KVM does not really do much with the PAT, so this went unnoticed for a
long time.  It is exposed however if you try to do rdmsr on the PAT
register.

Reported-by: Valentine Sinitsyn <valentine.sinitsyn@...il.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 792206c8e555..694851592399 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -455,7 +455,7 @@ struct kvm_vcpu_arch {
 	bool nmi_injected;    /* Trying to inject an NMI this entry */
 
 	struct mtrr_state_type mtrr_state;
-	u32 pat;
+	u64 pat;
 
 	int switch_db_regs;
 	unsigned long db[KVM_NR_DB_REGS];
-- 
2.0.0

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