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@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bbe184f07bf9daca7f199886d634e37f11e62283..457b908244f23ab08387c41a987c793f6895794f 100644 (file)
--- 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;