KVM: s390: reinject io interrupt on tpi failure
The tpi instruction should be suppressed on addressing and protection
exceptions, so we need to re-inject the dequeued io interrupt in that
case.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index a1403ba..1c74bb9 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -846,6 +846,12 @@
return __inject_vm(kvm, inti);
}
+void kvm_s390_reinject_io_int(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti)
+{
+ __inject_vm(kvm, inti);
+}
+
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
struct kvm_s390_interrupt *s390int)
{
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 11ed0a5..dc506f3 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -137,6 +137,8 @@
int __must_check kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code);
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
u64 cr6, u64 schid);
+void kvm_s390_reinject_io_int(struct kvm *kvm,
+ struct kvm_s390_interrupt_info *inti);
int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
/* implemented in priv.c */
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 4f6bc16..f4451f0 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -259,7 +259,15 @@
if (write_guest_lc(vcpu, __LC_SUBCHANNEL_ID, &tpi_data, len))
rc = -EFAULT;
}
- kfree(inti);
+ /*
+ * If we encounter a problem storing the interruption code, the
+ * instruction is suppressed from the guest's view: reinject the
+ * interrupt.
+ */
+ if (!rc)
+ kfree(inti);
+ else
+ kvm_s390_reinject_io_int(vcpu->kvm, inti);
no_interrupt:
/* Set condition code and we're done. */
if (!rc)