diff options
authorChristoffer Dall <>2019-04-25 13:57:40 +0100
committerMarc Zyngier <>2019-04-25 14:13:31 +0100
commit6bc210003dff7b789efae5bb02a0320dc24dd416 (patch)
parent2e8010bb71b39ff18aac9fb209b3c3093f4c4783 (diff)
KVM: arm/arm64: Don't emulate virtual timers on userspace ioctls
When a VCPU never runs before a guest exists, but we set timer registers up via ioctls, the associated hrtimer might never get cancelled. Since we moved vcpu_load/put into the arch-specific implementations and only have load/put for KVM_RUN, we won't ever have a scheduled hrtimer for emulating a timer when modifying the timer state via an ioctl from user space. All we need to do is make sure that we pick up the right state when we load the timer state next time userspace calls KVM_RUN again. We also do not need to worry about this interacting with the bg_timer, because if we were in WFI from the guest, and somehow ended up in a kvm_arm_timer_set_reg, it means that: 1. the VCPU thread has received a signal, 2. we have called vcpu_load when being scheduled in again, 3. we have called vcpu_put when we returned to userspace for it to issue another ioctl And therefore will not have a bg_timer programmed and the event is treated as a spurious wakeup from WFI if userspace decides to run the vcpu again even if there are not virtual interrupts. This fixes stray virtual timer interrupts triggered by an expiring hrtimer, which happens after a failed live migration, for instance. Fixes: bee038a674875 ("KVM: arm/arm64: Rework the timer code to use a timer_map") Signed-off-by: Christoffer Dall <> Reported-by: Andre Przywara <> Tested-by: Andre Przywara <> Signed-off-by: Andre Przywara <> Signed-off-by: Marc Zyngier <>
1 files changed, 8 insertions, 5 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index d43308dc3617..7fc272ecae16 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -508,6 +508,14 @@ static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu)
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+ * Update the timer output so that it is likely to match the
+ * state we're about to restore. If the timer expires between
+ * this point and the register restoration, we'll take the
+ * interrupt anyway.
+ */
+ kvm_timer_update_irq(vcpu, kvm_timer_should_fire(vtimer), vtimer);
+ /*
* When using a userspace irqchip with the architected timers and a
* host interrupt controller that doesn't support an active state, we
* must still prevent continuously exiting from the guest, and
@@ -730,7 +738,6 @@ static void kvm_timer_init_interrupt(void *info)
int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
struct arch_timer_context *timer;
- bool level;
switch (regid) {
@@ -758,10 +765,6 @@ int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
return -1;
- level = kvm_timer_should_fire(timer);
- kvm_timer_update_irq(vcpu, level, timer);
- timer_emulate(timer);
return 0;