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s390: fix cpu hotplug / cpu activity on interrupts

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The add_del/running_cpu code and env->halted are tracking stopped cpus.
Sleeping cpus (idle and enabled for interrupts) are waiting inside the
kernel.
No interrupt besides the restart can move a cpu from stopped to
operational. This is already handled over there. So lets just remove
the bogus wakup from the common interrupt delivery, otherwise any
interrupt will wake up a cpu, even if this cpu is stopped (Thus leading
to strange hangs on sigp restart)

This fixes
echo 0 > /sys/devices/system/cpu/cpu0/online
echo 1 > /sys/devices/system/cpu/cpu0/online
in the guest

Signed-off-by: Christian Borntraeger<borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Christian Borntraeger 2011-11-20 23:12:03 +00:00 committed by Alexander Graf
parent 7d77793d6b
commit 93116ac0cf
1 changed files with 0 additions and 3 deletions
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3
target-s390x/kvm.c
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@ -185,9 +185,6 @@ void kvm_s390_interrupt_internal(CPUState *env, int type, uint32_t parm,
return;
}
s390_add_running_cpu(env);
qemu_cpu_kick(env);
kvmint.type = type;
kvmint.parm = parm;
kvmint.parm64 = parm64;