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KVM: take srcu lock before call to complete_pio()

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complete_pio() may use slot table which is protected by srcu.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-03-09 12:01:10 +02:00 committed by Avi Kivity
parent 01bf0b6457
commit 7567cae105
1 changed files with 2 additions and 0 deletions
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arch/x86/kvm/x86.c
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@ -4483,7 +4483,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
kvm_set_cr8(vcpu, kvm_run->cr8); kvm_set_cr8(vcpu, kvm_run->cr8);
if (vcpu->arch.pio.cur_count) { if (vcpu->arch.pio.cur_count) {
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = complete_pio(vcpu); r = complete_pio(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
if (r) if (r)
goto out; goto out;
} }