From df18b2db69fd1696e1f2eb1d8652340b4c57793a Mon Sep 17 00:00:00 2001 From: Michael Roth Date: Mon, 25 Apr 2016 17:24:25 -0500 Subject: spapr_drc: fix aborts during DRC-count based hotplug 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 Cc: Bharata B Rao Cc: david@gibson.dropbear.id.au Cc: qemu-ppc@nongnu.org Signed-off-by: Michael Roth Signed-off-by: David Gibson --- hw/ppc/spapr_drc.c | 12 +++++++++++- hw/ppc/spapr_events.c | 7 +++---- 2 files changed, 14 insertions(+), 5 deletions(-) diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c index 317394027a..1f5f1d790a 100644 --- a/hw/ppc/spapr_drc.c +++ b/hw/ppc/spapr_drc.c @@ -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)), diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index 269ab7e61c..049fb1b325 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -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)); } -- cgit v1.2.1