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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2015-04-30 13:33:59 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-07-10 09:49:36 -0700
commit14fe2f14d73609cfdb19b71467d085e5347f7353 (patch)
tree972c59346c46744014a6e217a0d2cd8d4387f07c /arch/s390
parent4f3d3bc20372afb29708307608946e2bb56a5a64 (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.c2
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);