commit 56c103ec040b1944c8866f79aa768265c0dd2986
author Liu, Jinsong <jinsong.liu@intel.com> Fri Feb 21 17:39:02 2014 +0000
committer Paolo Bonzini <pbonzini@redhat.com> Sat Feb 22 15:53:34 2014 +0100
tree 7201960f61ecfd19f3e78dfa6d6526822f055786
parent 49345f13f0830741b94b867cf906c4aad3988306

KVM: x86: Fix xsave cpuid exposing bug

From 00c920c96127d20d4c3bb790082700ae375c39a0 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@intel.com>
Date: Fri, 21 Feb 2014 23:47:18 +0800
Subject: [PATCH] KVM: x86: Fix xsave cpuid exposing bug

EBX of cpuid(0xD, 0) is dynamic per XCR0 features enable/disable.
Bit 63 of XCR0 is reserved for future expansion.

Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/xsave.h

diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 5547389..dcd047b 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -13,6 +13,8 @@
 #define XSTATE_BNDCSR	0x10
 
 #define XSTATE_FPSSE	(XSTATE_FP | XSTATE_SSE)
+/* Bit 63 of XCR0 is reserved for future expansion */
+#define XSTATE_EXTEND_MASK	(~(XSTATE_FPSSE | (1ULL << 63)))
 
 #define FXSAVE_SIZE	512