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s390x: sigp: Reorder the SIGP STOP code 

Let's wait to mark the VCPU STOPPED until the possible
STORE STATUS operation is completed, so that we know the
CPU is fully stopped and done doing anything. (When we
also clear the possible sigp_order field for STOP orders.)

Suggested-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20211213210919.856693-2-farman@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Eric Farman 2021-12-13 22:09:19 +01:00 committed by Thomas Huth
parent b2173046a6
commit 59b9b5186e
1 changed files with 8 additions and 4 deletions
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12
target/s390x/sigp.c
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@ -139,7 +139,7 @@ static void sigp_stop_and_store_status(CPUState *cs, run_on_cpu_data arg)
case S390_CPU_STATE_OPERATING:
cpu->env.sigp_order = SIGP_STOP_STORE_STATUS;
cpu_inject_stop(cpu);
/* store will be performed in do_stop_interrup() */
/* store will be performed in do_stop_interrupt() */
break;
case S390_CPU_STATE_STOPPED:
/* already stopped, just store the status */
@ -479,13 +479,17 @@ void do_stop_interrupt(CPUS390XState *env)
{
S390CPU *cpu = env_archcpu(env);
if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
/*
* Complete the STOP operation before exposing the CPU as
* STOPPED to the system.
*/
if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
}
env->sigp_order = 0;
if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) {
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
}
env->pending_int &= ~INTERRUPT_STOP;
}