From: Avi Kivity <avi@qumranet.com>
Date: Thu, 6 Dec 2007 14:32:45 +0000 (+0200)
Subject: KVM: VMX: Avoid exit when setting cr8 if the local apic is in the kernel
X-Git-Tag: v2.6.25-rc1~1138^2~56
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e5314067f6a77688a3d36548e7618430ce4a6236;p=platform%2Fkernel%2Flinux-3.10.git

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 <avi@qumranet.com>
---

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 3b44573..8308434 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;
 		};