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[Qemu-devel] [PATCH for-2.12 REPOST] spapr_cpu_core: instantiate CPUs se
From: |
Greg Kurz |
Subject: |
[Qemu-devel] [PATCH for-2.12 REPOST] spapr_cpu_core: instantiate CPUs separately |
Date: |
Mon, 20 Nov 2017 10:19:54 +0100 |
User-agent: |
StGit/0.17.1-46-g6855-dirty |
The current code assumes that only the CPU core object holds a
reference on each individual CPU object, and happily frees their
allocated memory when the core is unrealized. This is dangerous
as some other code can legitimely keep a pointer to a CPU if it
calls object_ref(), but it would end up with a dangling pointer.
Let's allocate all CPUs with object_new() and let QOM frees them
when their reference count reaches zero. This greatly simplify the
code as we don't have to fiddle with the instance size anymore.
Signed-off-by: Greg Kurz <address@hidden>
---
hw/ppc/spapr.c | 11 +++--------
hw/ppc/spapr_cpu_core.c | 19 +++++++------------
include/hw/ppc/spapr_cpu_core.h | 2 +-
3 files changed, 11 insertions(+), 21 deletions(-)
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 174e7ff0678d..fc92b9d914a5 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3173,12 +3173,10 @@ void spapr_core_release(DeviceState *dev)
if (smc->pre_2_10_has_unused_icps) {
sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev));
- sPAPRCPUCoreClass *scc = SPAPR_CPU_CORE_GET_CLASS(OBJECT(cc));
- size_t size = object_type_get_instance_size(scc->cpu_type);
int i;
for (i = 0; i < cc->nr_threads; i++) {
- CPUState *cs = CPU(sc->threads + i * size);
+ CPUState *cs = CPU(sc->threads[i]);
pre_2_10_vmstate_register_dummy_icp(cs->cpu_index);
}
@@ -3224,7 +3222,7 @@ static void spapr_core_plug(HotplugHandler *hotplug_dev,
DeviceState *dev,
sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(mc);
sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev));
CPUCore *cc = CPU_CORE(dev);
- CPUState *cs = CPU(core->threads);
+ CPUState *cs = CPU(core->threads[0]);
sPAPRDRConnector *drc;
Error *local_err = NULL;
int smt = kvmppc_smt_threads();
@@ -3269,15 +3267,12 @@ static void spapr_core_plug(HotplugHandler
*hotplug_dev, DeviceState *dev,
core_slot->cpu = OBJECT(dev);
if (smc->pre_2_10_has_unused_icps) {
- sPAPRCPUCoreClass *scc = SPAPR_CPU_CORE_GET_CLASS(OBJECT(cc));
- size_t size = object_type_get_instance_size(scc->cpu_type);
int i;
for (i = 0; i < cc->nr_threads; i++) {
sPAPRCPUCore *sc = SPAPR_CPU_CORE(dev);
- void *obj = sc->threads + i * size;
- cs = CPU(obj);
+ cs = CPU(sc->threads[i]);
pre_2_10_vmstate_unregister_dummy_icp(cs->cpu_index);
}
}
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 3a4c17401226..588f9b45714a 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -79,13 +79,11 @@ const char *spapr_get_cpu_core_type(const char *cpu_type)
static void spapr_cpu_core_unrealizefn(DeviceState *dev, Error **errp)
{
sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev));
- sPAPRCPUCoreClass *scc = SPAPR_CPU_CORE_GET_CLASS(OBJECT(dev));
- size_t size = object_type_get_instance_size(scc->cpu_type);
CPUCore *cc = CPU_CORE(dev);
int i;
for (i = 0; i < cc->nr_threads; i++) {
- void *obj = sc->threads + i * size;
+ Object *obj = OBJECT(sc->threads[i]);
DeviceState *dev = DEVICE(obj);
CPUState *cs = CPU(dev);
PowerPCCPU *cpu = POWERPC_CPU(cs);
@@ -146,9 +144,8 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error
**errp)
sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev));
sPAPRCPUCoreClass *scc = SPAPR_CPU_CORE_GET_CLASS(OBJECT(dev));
CPUCore *cc = CPU_CORE(OBJECT(dev));
- size_t size;
Error *local_err = NULL;
- void *obj;
+ Object *obj;
int i, j;
if (!spapr) {
@@ -156,18 +153,16 @@ static void spapr_cpu_core_realize(DeviceState *dev,
Error **errp)
return;
}
- size = object_type_get_instance_size(scc->cpu_type);
- sc->threads = g_malloc0(size * cc->nr_threads);
+ sc->threads = g_new(PowerPCCPU *, cc->nr_threads);
for (i = 0; i < cc->nr_threads; i++) {
char id[32];
CPUState *cs;
PowerPCCPU *cpu;
- obj = sc->threads + i * size;
+ obj = object_new(scc->cpu_type);
- object_initialize(obj, size, scc->cpu_type);
cs = CPU(obj);
- cpu = POWERPC_CPU(cs);
+ cpu = sc->threads[i] = POWERPC_CPU(obj);
cs->cpu_index = cc->core_id + i;
cpu->vcpu_id = (cc->core_id * spapr->vsmt / smp_threads) + i;
if (kvm_enabled() && !kvm_vcpu_id_is_valid(cpu->vcpu_id)) {
@@ -192,7 +187,7 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error
**errp)
}
for (j = 0; j < cc->nr_threads; j++) {
- obj = sc->threads + j * size;
+ obj = OBJECT(sc->threads[j]);
spapr_cpu_core_realize_child(obj, spapr, &local_err);
if (local_err) {
@@ -203,7 +198,7 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error
**errp)
err:
while (--i >= 0) {
- obj = sc->threads + i * size;
+ obj = OBJECT(sc->threads[i]);
object_unparent(obj);
}
g_free(sc->threads);
diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h
index f2d48d6a6786..1129f344aa0c 100644
--- a/include/hw/ppc/spapr_cpu_core.h
+++ b/include/hw/ppc/spapr_cpu_core.h
@@ -28,7 +28,7 @@ typedef struct sPAPRCPUCore {
CPUCore parent_obj;
/*< public >*/
- void *threads;
+ PowerPCCPU **threads;
int node_id;
} sPAPRCPUCore;
- [Qemu-devel] [PATCH for-2.12 REPOST] spapr_cpu_core: instantiate CPUs separately,
Greg Kurz <=