Hi Marc, On 6/2/22 10:30, Marc Zyngier wrote: > A recurrent bug in the KVM/arm64 code base consists in trying to > access the timer pending state outside of the vcpu context, which > makes zero sense (the pending state only exists when the vcpu > is loaded). > > In order to avoid more embarassing crashes and catch the offenders > red-handed, add a warning to kvm_arch_timer_get_input_level() and > return the state as non-pending. This avoids taking the system down, > and still helps tracking down silly bugs. > > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx> Eric > --- > arch/arm64/kvm/arch_timer.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c > index 5290ca5db663..bb24a76b4224 100644 > --- a/arch/arm64/kvm/arch_timer.c > +++ b/arch/arm64/kvm/arch_timer.c > @@ -1230,6 +1230,9 @@ bool kvm_arch_timer_get_input_level(int vintid) > struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); > struct arch_timer_context *timer; > > + if (WARN(!vcpu, "No vcpu context!\n")) > + return false; > + > if (vintid == vcpu_vtimer(vcpu)->irq.irq) > timer = vcpu_vtimer(vcpu); > else if (vintid == vcpu_ptimer(vcpu)->irq.irq)
