diff options
| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2015-04-30 13:33:59 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-10 09:49:36 -0700 |
| commit | 14fe2f14d73609cfdb19b71467d085e5347f7353 (patch) | |
| tree | 972c59346c46744014a6e217a0d2cd8d4387f07c /arch/s390 | |
| parent | 4f3d3bc20372afb29708307608946e2bb56a5a64 (diff) | |
KVM: s390: fix external call injection without sigp interpretation
commit b938eacea0b6881f2116a061e6da3ec840e75137 upstream.
Commit ea5f49692575 ("KVM: s390: only one external call may be pending
at a time") introduced a bug on machines that don't have SIGP
interpretation facility installed.
The injection of an external call will now always fail with -EBUSY
(if none is already pending).
This leads to the following symptoms:
- An external call will be injected but with the wrong "src cpu id",
as this id will not be remembered.
- The target vcpu will not be woken up, therefore the guest will hang if
it cannot deal with unexpected failures of the SIGP EXTERNAL CALL
instruction.
- If an external call is already pending, -EBUSY will not be reported.
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 9de47265ef73..2836b25f63d3 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1061,7 +1061,7 @@ static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq) if (sclp_has_sigpif()) return __inject_extcall_sigpif(vcpu, src_id); - if (!test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) + if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) return -EBUSY; *extcall = irq->u.extcall; atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); |