Recent commit b8165118f52c "spapr: support memory unplug for qtest" broke
CPU hotplug tests for old machine types:
$ QTEST_QEMU_BINARY=ppc64-softmmu/qemu-system-ppc64 ./tests/cpu-plug-test
-m=slow
/ppc64/cpu-plug/pseries-3.1/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-2.12-sxxm/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-3.0/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-2.10/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-2.11/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-2.12/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-2.9/device-add/2x3x1&maxcpus=6: OK
/ppc64/cpu-plug/pseries-2.7/device-add/2x3x1&maxcpus=6: **
ERROR:/home/thuth/devel/qemu/hw/ppc/spapr_events.c:313:rtas_event_log_to_source:
assertion failed: (source->enabled)
Broken pipe
/home/thuth/devel/qemu/tests/libqtest.c:143: kill_qemu() detected QEMU death
from signal 6 (Aborted) (core dumped)
Aborted (core dumped)
The rtas_event_log_to_source() function is supposed to return the event
source to be used for a given event type. In the case of hotplug, it first
tries EVENT_CLASS_HOT_PLUG and, if the guest doesn't support it, it falls
back to EVENT_CLASS_EPOW.
This works well for machine types that enable EVENT_CLASS_HOT_PLUG. For
older machine types, this happened to work because they don't set the
OV5_HP_EVT bit in spapr->ov5. CAS hence logically keeps the bit cleared
in spapr->ov5_cas and we avoid the assert.
As shown by commit b8165118f52c, the logic is fragile and we need a
bigger hammer to ensure that rtas_event_log_to_source() doesn't go
down the EVENT_CLASS_HOT_PLUG path with older machine types.
Signed-off-by: Greg Kurz <gr...@kaod.org>
---
hw/ppc/spapr_events.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
index ab9a1f0063d5..1a09dab6857d 100644
--- a/hw/ppc/spapr_events.c
+++ b/hw/ppc/spapr_events.c
@@ -307,11 +307,13 @@ rtas_event_log_to_source(sPAPRMachineState *spapr, int
log_type)
switch (log_type) {
case RTAS_LOG_TYPE_HOTPLUG:
- source = spapr_event_sources_get_source(spapr->event_sources,
- EVENT_CLASS_HOT_PLUG);
- if (spapr_ovec_test(spapr->ov5_cas, OV5_HP_EVT)) {
- g_assert(source->enabled);
- break;
+ if (spapr->use_hotplug_event_source) {
+ source = spapr_event_sources_get_source(spapr->event_sources,
+ EVENT_CLASS_HOT_PLUG);
+ if (spapr_ovec_test(spapr->ov5_cas, OV5_HP_EVT)) {
+ g_assert(source->enabled);
+ break;
+ }
}
/* fall back to epow for legacy hotplug interrupt source */
case RTAS_LOG_TYPE_EPOW:
