linux-kernel - [PATCH v3 10/10] KVM: x86: do not reset mmu if CR0.CD and CR0.NW are changed

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Message-Id: <1431499348-25188-11-git-send-email-guangrong.xiao@linux.intel.com>
Date:	Wed, 13 May 2015 14:42:28 +0800
From:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
To:	pbonzini@...hat.com
Cc:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: [PATCH v3 10/10] KVM: x86: do not reset mmu if CR0.CD and CR0.NW are changed

CR0.CD and CR0.NW are not used by shadow page table so that need
not adjust mmu if these two bit are changed

Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
---
 arch/x86/kvm/x86.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bbe184f..457b908 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -572,8 +572,7 @@ out:
 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 	unsigned long old_cr0 = kvm_read_cr0(vcpu);
-	unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
-				    X86_CR0_CD | X86_CR0_NW;
+	unsigned long update_bits = X86_CR0_PG | X86_CR0_WP;
 
 	cr0 |= X86_CR0_ET;
 
-- 
2.1.0

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