[RFC:,not,fully,tested,yet] Fix the x86 emulation of in: remove redandancy

Commit Message

Takuya Yoshikawa Feb. 5, 2010, 8:52 a.m. UTC

None

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d47ceda..fcbe3a7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3550,8 +3550,10 @@  int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in, int size, unsigned port)
 	trace_kvm_pio(vcpu->run->io.direction == KVM_EXIT_IO_OUT, port,
 		      size, 1);
 
-	val = kvm_register_read(vcpu, VCPU_REGS_RAX);
-	memcpy(vcpu->arch.pio_data, &val, 4);
+	if (!vcpu->arch.pio.in) {
+		val = kvm_register_read(vcpu, VCPU_REGS_RAX);
+		memcpy(vcpu->arch.pio_data, &val, 4);
+	}
 
 	if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
 		complete_pio(vcpu);