From da00fcbdac1b00bf33b71093047e975cc1f68779 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Fri, 21 Nov 2014 09:38:12 +0100 Subject: [PATCH] KVM: s390: trigger the right CPU exit for floating interrupts When injecting a floating interrupt and no CPU is idle we kick one CPU to do an external exit. In case of I/O we should trigger an I/O exit instead. This does not matter for Linux guests as external and I/O interrupts are enabled/disabled at the same time, but play safe anyway. The same holds true for machine checks. Since there is no special exit, just reuse the generic stop exit. The injection code inside the VCPU loop will recheck anyway and rearm the proper exits (e.g. control registers) if necessary. Signed-off-by: Christian Borntraeger Reviewed-by: Thomas Huth Reviewed-by: David Hildenbrand --- arch/s390/kvm/interrupt.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 4fc3fed..ead52bf 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -851,7 +851,17 @@ static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) dst_vcpu = kvm_get_vcpu(kvm, sigcpu); li = &dst_vcpu->arch.local_int; spin_lock(&li->lock); - atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); + switch (inti->type) { + case KVM_S390_MCHK: + atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags); + break; + case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX: + atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags); + break; + default: + atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); + break; + } spin_unlock(&li->lock); kvm_s390_vcpu_wakeup(kvm_get_vcpu(kvm, sigcpu)); unlock_fi: -- 2.7.4