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s390x/kvm: proper use of the cpu states OPERATING and STOPPED

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This patch makes sure that halting a cpu and stopping a cpu are two different
things. Stopping a cpu will also set the cpu halted - this is needed for common
infrastructure to work (note that the stop and stopped flag cannot be used for
our purpose because they are already used by other mechanisms).

A cpu can be halted ("waiting") when it is operating. If interrupts are
disabled, this is called a "disabled wait", as it can't be woken up anymore. A
stopped cpu is treated like a "disabled wait" cpu, but in order to prepare for a
proper cpu state synchronization with the kvm part, we need to track the real
logical state of a cpu.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
CC: Andreas Faerber <afaerber@suse.de>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
David Hildenbrand 2014-09-30 10:57:29 +02:00 • committed by Cornelia Huck
parent 75973bfe41
commit eb24f7c689
6 changed files with 81 additions and 52 deletions
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2
hw/s390x/ipl.c
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@ -176,7 +176,7 @@ static void s390_ipl_reset(DeviceState *dev)
}
}
s390_add_running_cpu(cpu);
s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
}
static void s390_ipl_class_init(ObjectClass *klass, void *data)