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s390x/tcg: handle WAIT PSWs during interrupt injection

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If we encounter a WAIT PSW, we have to halt immediately. Using
cpu_loop_exit() at this point feels wrong. Simply leaving
cs->exception_index set doesn't result in an immediate stop.

This is also necessary to properly handle SIGP STOP interrupts later.

The CPU_INTERRUPT_HALT will be processed immediately and properly set
the CPU to halted (also resetting cs->exception_index to EXCP_HLT)

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170928203708.9376-10-david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2017-09-28 22:36:47 +02:00 committed by Cornelia Huck
parent 83f7f32901
commit f1cbfe6a73
1 changed files with 6 additions and 0 deletions
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6
target/s390x/excp_helper.c
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@ -468,6 +468,12 @@ void s390_cpu_do_interrupt(CPUState *cs)
do_mchk_interrupt(env);
break;
}
/* WAIT PSW during interrupt injection */
if (cs->exception_index == EXCP_HLT) {
/* don't trigger a cpu_loop_exit(), use an interrupt instead */
cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HALT);
}
cs->exception_index = -1;
/* we might still have pending interrupts, but not deliverable */