From 24eb9cdf2242853b568bdcc762bb4914a846821b Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 12 Jul 2016 07:41:59 +0200 Subject: [PATCH 26/34] spapr: Ensure thread0 of CPU core is always realized first RH-Author: David Gibson Message-id: <1468309320-14859-27-git-send-email-dgibson@redhat.com> Patchwork-id: 71146 O-Subject: [RHEL7.3 qemu-kvm-rhev PATCHv2 26/27] spapr: Ensure thread0 of CPU core is always realized first Bugzilla: 1172917 RH-Acked-by: Igor Mammedov RH-Acked-by: Laurent Vivier RH-Acked-by: Thomas Huth From: Bharata B Rao During CPU core realization, we create all the thread objects and parent them to the core object in a loop. However, the realization of thread objects is done separately by walking the threads of a core using object_child_foreach(). With this, there is no guarantee on the order in which the child thread objects get realized. Since CPU device tree properties are currently derived from the CPU thread object, we assume thread0 of the core to be the representative thread of the core when creating device tree properties for the core. If thread0 is not the first thread that gets realized, then we would end up having an incorrect dt_id for the core and this causes hotplug failures from the guest. Fix this by realizing each thread object by walking the core's thread object list thereby ensuring that thread0 and other threads are always realized in the correct order. Future TODO: CPU DT nodes are per-core properties and we should ideally base the creation of CPU DT nodes on core objects rather than the thread objects. Signed-off-by: Bharata B Rao Reviewed-by: Greg Kurz Signed-off-by: David Gibson (cherry picked from commit 7093645a843e5da1a750bc451dd8c9107d595c61) Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1172917 Signed-off-by: David Gibson Signed-off-by: Miroslav Rezanina --- hw/ppc/spapr_cpu_core.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index 45aeb5d..106557d 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -259,9 +259,9 @@ out: error_propagate(errp, local_err); } -static int spapr_cpu_core_realize_child(Object *child, void *opaque) +static void spapr_cpu_core_realize_child(Object *child, Error **errp) { - Error **errp = opaque, *local_err = NULL; + Error *local_err = NULL; sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); CPUState *cs = CPU(child); PowerPCCPU *cpu = POWERPC_CPU(cs); @@ -269,15 +269,14 @@ static int spapr_cpu_core_realize_child(Object *child, void *opaque) object_property_set_bool(child, true, "realized", &local_err); if (local_err) { error_propagate(errp, local_err); - return 1; + return; } spapr_cpu_init(spapr, cpu, &local_err); if (local_err) { error_propagate(errp, local_err); - return 1; + return; } - return 0; } static void spapr_cpu_core_realize(DeviceState *dev, Error **errp) @@ -287,13 +286,13 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp) const char *typename = object_class_get_name(sc->cpu_class); size_t size = object_type_get_instance_size(typename); Error *local_err = NULL; - Object *obj; - int i; + void *obj; + int i, j; sc->threads = g_malloc0(size * cc->nr_threads); for (i = 0; i < cc->nr_threads; i++) { char id[32]; - void *obj = sc->threads + i * size; + obj = sc->threads + i * size; object_initialize(obj, size, typename); snprintf(id, sizeof(id), "thread[%d]", i); @@ -303,12 +302,16 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp) } object_unref(obj); } - object_child_foreach(OBJECT(dev), spapr_cpu_core_realize_child, &local_err); - if (local_err) { - goto err; - } else { - return; + + for (j = 0; j < cc->nr_threads; j++) { + obj = sc->threads + j * size; + + spapr_cpu_core_realize_child(obj, &local_err); + if (local_err) { + goto err; + } } + return; err: while (--i >= 0) { -- 1.8.3.1