From: David Hildenbrand <d...@linux.vnet.ibm.com> If CPUSTAT_ECALL_PEND isn't set, we can't have an external call pending, so we can directly avoid taking the lock.
Acked-by: Christian Borntraeger <borntrae...@de.ibm.com> Signed-off-by: David Hildenbrand <d...@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com> --- arch/s390/kvm/interrupt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 831c9ac..62ec925 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -39,6 +39,9 @@ static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) { int c, scn; + if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND)) + return 0; + read_lock(&vcpu->kvm->arch.sca_lock); if (vcpu->kvm->arch.use_esca) { struct esca_block *sca = vcpu->kvm->arch.sca; @@ -60,8 +63,7 @@ static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) if (src_id) *src_id = scn; - return c && atomic_read(&vcpu->arch.sie_block->cpuflags) & - CPUSTAT_ECALL_PEND; + return c; } static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id) -- 2.3.0 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html