Commit da00fcbd authored Nov 21, 2014 by Christian Borntraeger

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 <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>

parent 04b41acd

arch/s390/kvm/interrupt.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -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);
		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:

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