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s390x/kvm: deliver SIGP RESTART directly if stopped

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According to the PoP, a restart irq has to be delivered "without first honoring
any other pending interruptions", if a cpu is in the STOPPED state.

While it is hard to implement this case in kvm, it can easily be handled in qemu.

Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <1424783731-43426-10-git-send-email-jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2015-02-24 14:15:30 +01:00 committed by Christian Borntraeger
parent 3f10341ffb
commit e3b7b57807
1 changed files with 11 additions and 2 deletions
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11
target-s390x/kvm.c
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@ -1254,8 +1254,17 @@ static void sigp_restart(void *arg)
.type = KVM_S390_RESTART, .type = KVM_S390_RESTART,
}; };
kvm_s390_vcpu_interrupt(si->cpu, &irq); switch (s390_cpu_get_state(si->cpu)) {
case CPU_STATE_STOPPED:
/* the restart irq has to be delivered prior to any other pending irq */
cpu_synchronize_state(CPU(si->cpu));
do_restart_interrupt(&si->cpu->env);
s390_cpu_set_state(CPU_STATE_OPERATING, si->cpu); s390_cpu_set_state(CPU_STATE_OPERATING, si->cpu);
break;
case CPU_STATE_OPERATING:
kvm_s390_vcpu_interrupt(si->cpu, &irq);
break;
}
si->cc = SIGP_CC_ORDER_CODE_ACCEPTED; si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
} }