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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>
This commit is contained in:
Avi Kivity 2007-12-06 16:32:45 +02:00
parent e934c9c1c8
commit e5314067f6
1 changed files with 2 additions and 0 deletions
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2
drivers/kvm/vmx.c
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@ -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;
};