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KVM: s390: Fixes for interrupt delivery

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Two bugs that might result in CPUs not woken up when interrupts are
 pending.
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Merge tag 'kvm-s390-master-5.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390: Fixes for interrupt delivery

Two bugs that might result in CPUs not woken up when interrupts are
pending.
This commit is contained in:
Paolo Bonzini 2021-10-25 09:08:56 -04:00
commit 4b2caef043
2 changed files with 4 additions and 2 deletions
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5
arch/s390/kvm/interrupt.c
View File

@ -3053,13 +3053,14 @@ static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
struct kvm_vcpu *vcpu;
u8 vcpu_isc_mask;
for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
vcpu = kvm_get_vcpu(kvm, vcpu_idx);
if (psw_ioint_disabled(vcpu))
continue;
deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
if (deliverable_mask) {
vcpu_isc_mask = (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
if (deliverable_mask & vcpu_isc_mask) {
/* lately kicked but not yet running */
if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
return;

1
arch/s390/kvm/kvm-s390.c
View File

@ -3363,6 +3363,7 @@ out_free_sie_block:
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
return kvm_s390_vcpu_has_irq(vcpu, 0);
}