From e5314067f6a77688a3d36548e7618430ce4a6236 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 6 Dec 2007 16:32:45 +0200 Subject: [PATCH] KVM: VMX: Avoid exit when setting cr8 if the local apic is in the kernel With apic in userspace, we must exit to userspace after a cr8 write in order to update the tpr. But if the apic is in the kernel, the exit is unnecessary. Noticed by Joerg Roedel. Signed-off-by: Avi Kivity --- drivers/kvm/vmx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 3b44573c326e..83084348581a 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1973,6 +1973,8 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) vcpu_load_rsp_rip(vcpu); set_cr8(vcpu, vcpu->regs[reg]); skip_emulated_instruction(vcpu); + if (irqchip_in_kernel(vcpu->kvm)) + return 1; kvm_run->exit_reason = KVM_EXIT_SET_TPR; return 0; }; -- 2.20.1