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s390x/tcg: implement SIGP SENSE

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Add it as preparation for TCG. Sensing could later be done completely
lockless.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170928203708.9376-21-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 22:36:58 +02:00 committed by Cornelia Huck
parent d1b468bc88
commit 302230fc44
1 changed files with 29 additions and 0 deletions
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29
target/s390x/sigp.c
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@ -32,6 +32,32 @@ static void set_sigp_status(SigpInfo *si, uint64_t status)
si->cc = SIGP_CC_STATUS_STORED;
}
static void sigp_sense(S390CPU *dst_cpu, SigpInfo *si)
{
uint8_t state = s390_cpu_get_state(dst_cpu);
bool ext_call = dst_cpu->env.pending_int & INTERRUPT_EXTERNAL_CALL;
uint64_t status = 0;
if (!tcg_enabled()) {
/* handled in KVM */
set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
return;
}
/* sensing without locks is racy, but it's the same for real hw */
if (state != CPU_STATE_STOPPED && !ext_call) {
si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
} else {
if (ext_call) {
status |= SIGP_STAT_EXT_CALL_PENDING;
}
if (state == CPU_STATE_STOPPED) {
status |= SIGP_STAT_STOPPED;
}
set_sigp_status(si, status);
}
}
static void sigp_start(CPUState *cs, run_on_cpu_data arg)
{
S390CPU *cpu = S390_CPU(cs);
@ -277,6 +303,9 @@ static int handle_sigp_single_dst(S390CPU *dst_cpu, uint8_t order,
}
switch (order) {
case SIGP_SENSE:
sigp_sense(dst_cpu, &si);
break;
case SIGP_START:
run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si));
break;