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[v3,32/37] KVM: s390: protvirt: do not inject interrupts after start

Message ID 20200220104020.5343-33-borntraeger@de.ibm.com (mailing list archive)
State New, archived
Headers show
Series KVM: s390: Add support for protected VMs | expand

Commit Message

Christian Borntraeger Feb. 20, 2020, 10:40 a.m. UTC 
As PSW restart is handled by the ultravisor (and we only get a start
notification) we must re-check the PSW after a start before injecting
interrupts.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 arch/s390/kvm/kvm-s390.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4503f153efd7..76ab9e4c8f55 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4479,6 +4479,13 @@  int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
 	if (kvm_s390_pv_cpu_is_protected(vcpu))
 		r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
 	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
+	/*
+	 * The real PSW might have changed due to a RESTART interpreted by the
+	 * ultravisor. We block all interrupts and let the next sie exit
+	 * refresh our view.
+	 */
+	if (kvm_s390_pv_cpu_is_protected(vcpu))
+		vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
 	/*
 	 * Another VCPU might have used IBS while we were offline.
 	 * Let's play safe and flush the VCPU at startup.