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KVM: set debug registers after "schedulable" section

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The vcpu thread can be preempted after the guest_debug_pre() callback,
resulting in invalid debug registers on the new vcpu.

Move it inside the non-preemptable section.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti 2008-08-01 20:09:13 -03:00 committed by Avi Kivity
parent 8349b5cd81
commit 29415c37f0
1 changed files with 4 additions and 5 deletions
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9
arch/x86/kvm/x86.c
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@ -3113,10 +3113,6 @@ static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
down_read(&vcpu->kvm->slots_lock);
vapic_enter(vcpu);
preempted:
if (vcpu->guest_debug.enabled)
kvm_x86_ops->guest_debug_pre(vcpu);
again:
if (vcpu->requests)
if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
@ -3170,6 +3166,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
goto out;
}
if (vcpu->guest_debug.enabled)
kvm_x86_ops->guest_debug_pre(vcpu);
vcpu->guest_mode = 1;
/*
* Make sure that guest_mode assignment won't happen after
@ -3244,7 +3243,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (r > 0) {
kvm_resched(vcpu);
down_read(&vcpu->kvm->slots_lock);
goto preempted;
goto again;
}
post_kvm_run_save(vcpu, kvm_run);