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KVM: s390: reinject io interrupt on tpi failure

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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>
This commit is contained in:
Cornelia Huck 2014-01-08 18:07:54 +01:00 committed by Christian Borntraeger
parent 4799b557c9
commit 2f32d4ea28
3 changed files with 17 additions and 1 deletions
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6
arch/s390/kvm/interrupt.c
View File

@ -846,6 +846,12 @@ int kvm_s390_inject_vm(struct kvm *kvm,
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)
{

2
arch/s390/kvm/kvm-s390.h
View File

@ -137,6 +137,8 @@ int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
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 */

10
arch/s390/kvm/priv.c
View File

@ -259,7 +259,15 @@ static int handle_tpi(struct kvm_vcpu *vcpu)
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)