Am 06.02.2012 10:59, schrieb Christian Borntraeger:
+static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
+{
+ int rc = 0;
+ struct kvm_s390_float_interrupt *fi =&vcpu->kvm->arch.float_int;
+
+ spin_lock(&fi->lock);
+ if (fi->local_int[cpu_addr]->action_bits& ACTION_STOP_ON_STOP)
+ rc = 2; /* busy */
+ else
+ VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
+ cpu_addr);
+ spin_unlock(&fi->lock);
+
+ return rc;
+}
local_int->action_bits is protected by the local int lock of subject CPU,
as one can see in patch #2 of this series. This is racy.
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