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spapr_drc: fix aborts during DRC-count based hotplug

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CPU/memory resources can be signalled en-masse via
spapr_hotplug_req_add_by_count(), and when doing so, actually change
the meaning of the 'drc' parameter passed to
spapr_hotplug_req_event() to be a count rather than an index.

f40eb92 added a hook in spapr_hotplug_req_event() to record when a
device had been 'signalled' to the guest, but that code assumes that
drc is always an index. In cases where it's a count, such as memory
hotplug, the DRC lookup will fail, leading to an assert.

Fix this by only explicitly setting the signalled state for cases where
we are doing PCI hotplug.

For other resources types, since we cannot selectively track whether a
resource has been signalled in cases where we signal attach as a count,
set the 'signalled' state to true immediately upon making the
resource available via drck->attach().

Reported-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: Bharata B Rao <bharata@linux.vnet.ibm.com>
Cc: david@gibson.dropbear.id.au
Cc: qemu-ppc@nongnu.org
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Michael Roth 2016-04-25 17:24:25 -05:00 committed by David Gibson
parent f419a626c7
commit df18b2db69
2 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
hw/ppc/spapr_drc.c
View File

@ -364,7 +364,17 @@ static void attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
drc->fdt = fdt;
drc->fdt_start_offset = fdt_start_offset;
drc->configured = coldplug;
drc->signalled = coldplug;
/* 'logical' DR resources such as memory/cpus are in some cases treated
* as a pool of resources from which the guest is free to choose from
* based on only a count. for resources that can be assigned in this
* fashion, we must assume the resource is signalled immediately
* since a single hotplug request might make an arbitrary number of
* such attached resources available to the guest, as opposed to
* 'physical' DR resources such as PCI where each device/resource is
* signalled individually.
*/
drc->signalled = (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI)
? true : coldplug;
object_property_add_link(OBJECT(drc), "device",
object_get_typename(OBJECT(drc->dev)),

7
hw/ppc/spapr_events.c
View File

@ -442,6 +442,9 @@ static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
switch (drc_type) {
case SPAPR_DR_CONNECTOR_TYPE_PCI:
hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_PCI;
if (hp->hotplug_action == RTAS_LOG_V6_HP_ACTION_ADD) {
spapr_hotplug_set_signalled(drc);
}
break;
case SPAPR_DR_CONNECTOR_TYPE_LMB:
hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_MEMORY;
@ -462,10 +465,6 @@ static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
rtas_event_log_queue(RTAS_LOG_TYPE_HOTPLUG, new_hp, true);
if (hp->hotplug_action == RTAS_LOG_V6_HP_ACTION_ADD) {
spapr_hotplug_set_signalled(drc);
}
qemu_irq_pulse(xics_get_qirq(spapr->icp, spapr->check_exception_irq));
}