[PATCH 1/3] KVM: X86: Delay read msr data iff writes ICR MSR

[Wanpeng Li <kernellwp@xxxxxxxxx>]

From: Wanpeng Li <wanpengli@xxxxxxxxxxx>

Delay read msr data until we identify guest accesses ICR MSR to avoid
to penalize all other MSR writes.

Signed-off-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3156e25..9232b15 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1568,11 +1568,12 @@ static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data
 enum exit_fastpath_completion handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu)
 {
 	u32 msr = kvm_rcx_read(vcpu);
-	u64 data = kvm_read_edx_eax(vcpu);
+	u64 data;
 	int ret = 0;
 
 	switch (msr) {
 	case APIC_BASE_MSR + (APIC_ICR >> 4):
+		data = kvm_read_edx_eax(vcpu);
 		ret = handle_fastpath_set_x2apic_icr_irqoff(vcpu, data);
 		break;
 	default:
-- 
2.7.4