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>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 24cd0ee896e9..2eb999dc9774 100644
--- 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;
         }