From: Gleb Natapov <gleb@redhat.com>
Date: Tue, 9 Mar 2010 10:01:10 +0000 (+0200)
Subject: KVM: take srcu lock before call to complete_pio()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7567cae105e435b53e5a3e778546dd3ec53e3204;p=linux-beck.git

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>
---

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;
 	}