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KVM: Move kvm_guest_exit() after local_irq_enable()

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We need to make sure that the timer interrupt happens before we clear
PF_VCPU, so the accounting code actually sees guest mode.

http://lkml.org/lkml/2007/10/15/114

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Laurent Vivier 2007-10-18 15:19:01 +02:00 committed by Avi Kivity
parent 4e62417bf3
commit 0552f73b9a
1 changed files with 10 additions and 1 deletions
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11
drivers/kvm/kvm_main.c
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@ -2054,12 +2054,21 @@ again:
kvm_x86_ops->run(vcpu, kvm_run); kvm_x86_ops->run(vcpu, kvm_run);
kvm_guest_exit();
vcpu->guest_mode = 0; vcpu->guest_mode = 0;
local_irq_enable(); local_irq_enable();
++vcpu->stat.exits; ++vcpu->stat.exits;
/*
* We must have an instruction between local_irq_enable() and
* kvm_guest_exit(), so the timer interrupt isn't delayed by
* the interrupt shadow. The stat.exits increment will do nicely.
* But we need to prevent reordering, hence this barrier():
*/
barrier();
kvm_guest_exit();
preempt_enable(); preempt_enable();
/* /*