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authorColeman Dietsch <dietschc@csp.edu>2022-08-08 21:06:07 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2022-08-10 21:08:25 +0200
commitc036899136355758dcd88878145036ab4d9c1f26 (patch)
treef688e74105ee4732c7c11fac64ce835b95081c4a /arch/x86/kvm
parentKVM: x86/xen: Initialize Xen timer only once (diff)
downloadlinux-c036899136355758dcd88878145036ab4d9c1f26.tar.xz
linux-c036899136355758dcd88878145036ab4d9c1f26.zip
KVM: x86/xen: Stop Xen timer before changing IRQ
Stop Xen timer (if it's running) prior to changing the IRQ vector and potentially (re)starting the timer. Changing the IRQ vector while the timer is still running can result in KVM injecting a garbage event, e.g. vm_xen_inject_timer_irqs() could see a non-zero xen.timer_pending from a previous timer but inject the new xen.timer_virq. Fixes: 536395260582 ("KVM: x86/xen: handle PV timers oneshot mode") Cc: stable@vger.kernel.org Link: https://syzkaller.appspot.com/bug?id=8234a9dfd3aafbf092cc5a7cd9842e3ebc45fc42 Reported-by: syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com Signed-off-by: Coleman Dietsch <dietschc@csp.edu> Reviewed-by: Sean Christopherson <seanjc@google.com> Acked-by: David Woodhouse <dwmw@amazon.co.uk> Message-Id: <20220808190607.323899-3-dietschc@csp.edu> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/xen.c35
1 files changed, 17 insertions, 18 deletions
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 6e554041e862..280cb5dc7341 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -707,26 +707,25 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data)
break;
case KVM_XEN_VCPU_ATTR_TYPE_TIMER:
- if (data->u.timer.port) {
- if (data->u.timer.priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL) {
- r = -EINVAL;
- break;
- }
- vcpu->arch.xen.timer_virq = data->u.timer.port;
-
- if (!vcpu->arch.xen.timer.function)
- kvm_xen_init_timer(vcpu);
-
- /* Restart the timer if it's set */
- if (data->u.timer.expires_ns)
- kvm_xen_start_timer(vcpu, data->u.timer.expires_ns,
- data->u.timer.expires_ns -
- get_kvmclock_ns(vcpu->kvm));
- } else if (kvm_xen_timer_enabled(vcpu)) {
- kvm_xen_stop_timer(vcpu);
- vcpu->arch.xen.timer_virq = 0;
+ if (data->u.timer.port &&
+ data->u.timer.priority != KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL) {
+ r = -EINVAL;
+ break;
}
+ if (!vcpu->arch.xen.timer.function)
+ kvm_xen_init_timer(vcpu);
+
+ /* Stop the timer (if it's running) before changing the vector */
+ kvm_xen_stop_timer(vcpu);
+ vcpu->arch.xen.timer_virq = data->u.timer.port;
+
+ /* Start the timer if the new value has a valid vector+expiry. */
+ if (data->u.timer.port && data->u.timer.expires_ns)
+ kvm_xen_start_timer(vcpu, data->u.timer.expires_ns,
+ data->u.timer.expires_ns -
+ get_kvmclock_ns(vcpu->kvm));
+
r = 0;
break;