On 02/07/2018 12:46 PM, David Hildenbrand wrote:
> Missed when enabling the Multiple-epoch facility. If the facility is
> installed and the control is set, a sign based comaprison has to be
> performed.
>
> Right now we would inject wrong interrupts and ignore interrupt
> conditions. Also the sleep time is calculated in a wrong way.
>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
applied. This will need some more testing but it probably deserves a CC stable.
> ---
> arch/s390/kvm/interrupt.c | 25 +++++++++++++++++++------
> 1 file changed, 19 insertions(+), 6 deletions(-)
>
> diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
> index 3ea9cfa31b16..a616e9b65f91 100644
> --- a/arch/s390/kvm/interrupt.c
> +++ b/arch/s390/kvm/interrupt.c
> @@ -169,8 +169,15 @@ static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
>
> static int ckc_irq_pending(struct kvm_vcpu *vcpu)
> {
> - if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
> + const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
> + const u64 ckc = vcpu->arch.sie_block->ckc;
> +
> + if (vcpu->arch.sie_block->gcr[0] & 0x0020000000000000ul) {
> + if ((s64)ckc >= (s64)now)
> + return 0;
> + } else if (ckc >= now) {
> return 0;
> + }
> return ckc_interrupts_enabled(vcpu);
> }
>
> @@ -1042,13 +1049,19 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
>
> static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
> {
> - u64 now, cputm, sltime = 0;
> + const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
> + const u64 ckc = vcpu->arch.sie_block->ckc;
> + u64 cputm, sltime = 0;
>
> if (ckc_interrupts_enabled(vcpu)) {
> - now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
> - sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
> - /* already expired or overflow? */
> - if (!sltime || vcpu->arch.sie_block->ckc <= now)
> + if (vcpu->arch.sie_block->gcr[0] & 0x0020000000000000ul) {
> + if ((s64)now < (s64)ckc)
> + sltime = tod_to_ns((s64)ckc - (s64)now);
> + } else if (now < ckc) {
> + sltime = tod_to_ns(ckc - now);
> + }
> + /* already expired */
> + if (!sltime)
> return 0;
> if (cpu_timer_interrupts_enabled(vcpu)) {
> cputm = kvm_s390_get_cpu_timer(vcpu);
>
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