KVM: take srcu lock before call to complete_pio()

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>
git-mirror · Apr 20, 2010 · 7567cae · 7567cae
1 parent 01bf0b6
commit 7567cae
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
@@ -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);
 
 	if (vcpu->arch.pio.cur_count) {
+		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 		r = complete_pio(vcpu);
+		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 		if (r)
 			goto out;
 	}