On Fri, Aug 06 2021 at 19:07, Hikaru Nishida wrote:
>
> +#ifdef CONFIG_KVM_VIRT_SUSPEND_TIMING
> +void kvm_arch_timekeeping_inject_sleeptime(const struct timespec64 *delta)
> +{
> + struct kvm_vcpu *vcpu;
> + u64 suspend_time_ns;
> + struct kvm *kvm;
> + s64 adj;
> + int i;
> +
> + suspend_time_ns = timespec64_to_ns(delta);
> + adj = tsc_khz * (suspend_time_ns / 1000000);
> + /*
> + * Adjust TSCs on all vcpus and kvmclock as if they are stopped
> + * during host's suspension.
> + * Also, cummulative suspend time is recorded in kvm structure and
> + * the update will be notified via an interrupt for each vcpu.
> + */
> + mutex_lock(&kvm_lock);
This is invoked from with timekeeper_lock held with interrupts
disabled. How is a mutex_lock() supposed to work here?
Thanks,
tglx
