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[Qemu-devel] [PATCH v3] i386, acpi: check acpi_memory_hotplug capacity i
From: |
Wei Yang |
Subject: |
[Qemu-devel] [PATCH v3] i386, acpi: check acpi_memory_hotplug capacity in pre_plug |
Date: |
Tue, 19 Feb 2019 08:53:22 +0800 |
Currently we do device realization like below:
hotplug_handler_pre_plug()
dc->realize()
hotplug_handler_plug()
Before we do device realization and plug, we should allocate necessary
resources and check if memory-hotplug-support property is enabled.
At the piix4 and ich9, the memory-hotplug-support property is checked at
plug stage. This means that device has been realized and mapped into guest
address space 'pc_dimm_plug()' by the time acpi plug handler is called,
where it might fail and crash QEMU due to reaching g_assert_not_reached()
(piix4) or error_abort (ich9).
Fix it by checking if memory hotplug is enabled at pre_plug stage
where we can gracefully abort hotplug request.
Signed-off-by: Wei Yang <address@hidden>
CC: Igor Mammedov <address@hidden>
CC: Eric Blake <address@hidden>
---
v3:
* replace acpi_memory_hotplug with memory-hotplug-support in changelog
* fix code alignment of ich9_pm_device_pre_plug_cb
* print which device type memory-hotplug-support is disabled in
ich9_pm_device_pre_plug_cb and piix4_device_pre_plug_cb
v2:
* (address@hidden)
- Almost the whole third paragraph
* apply this change to ich9
* use hotplug_handler_pre_plug() instead of open-coding check
---
hw/acpi/ich9.c | 15 +++++++++++++--
hw/acpi/piix4.c | 15 +++++++++++++--
hw/i386/pc.c | 5 +++++
hw/isa/lpc_ich9.c | 1 +
include/hw/acpi/ich9.h | 2 ++
5 files changed, 34 insertions(+), 4 deletions(-)
diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index c5d8646abc..e53dfe1ee3 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -483,13 +483,24 @@ void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs
*pm, Error **errp)
NULL);
}
+void ich9_pm_device_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
+ Error **errp)
+{
+ ICH9LPCState *lpc = ICH9_LPC_DEVICE(hotplug_dev);
+
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) &&
+ !lpc->pm.acpi_memory_hotplug.is_enabled)
+ error_setg(errp,
+ "memory hotplug is not enabled: %s.memory-hotplug-support "
+ "is not set", object_get_typename(OBJECT(lpc)));
+}
+
void ich9_pm_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
ICH9LPCState *lpc = ICH9_LPC_DEVICE(hotplug_dev);
- if (lpc->pm.acpi_memory_hotplug.is_enabled &&
- object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
nvdimm_acpi_plug_cb(hotplug_dev, dev);
} else {
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index e330f24c71..f7e3c2018d 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -370,13 +370,23 @@ static void piix4_pm_powerdown_req(Notifier *n, void
*opaque)
acpi_pm1_evt_power_down(&s->ar);
}
+static void piix4_device_pre_plug_cb(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ PIIX4PMState *s = PIIX4_PM(hotplug_dev);
+
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) &&
+ !s->acpi_memory_hotplug.is_enabled)
+ error_setg(errp,
+ "memory hotplug is not enabled: %s.memory-hotplug-support "
+ "is not set", object_get_typename(OBJECT(s)));
+}
static void piix4_device_plug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
PIIX4PMState *s = PIIX4_PM(hotplug_dev);
- if (s->acpi_memory_hotplug.is_enabled &&
- object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
nvdimm_acpi_plug_cb(hotplug_dev, dev);
} else {
@@ -702,6 +712,7 @@ static void piix4_pm_class_init(ObjectClass *klass, void
*data)
*/
dc->user_creatable = false;
dc->hotpluggable = false;
+ hc->pre_plug = piix4_device_pre_plug_cb;
hc->plug = piix4_device_plug_cb;
hc->unplug_request = piix4_device_unplug_request_cb;
hc->unplug = piix4_device_unplug_cb;
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 0f61314b79..0b11ebe2c9 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1674,6 +1674,11 @@ static void pc_memory_pre_plug(HotplugHandler
*hotplug_dev, DeviceState *dev,
return;
}
+ /*
+ * Check acpi_dev memory-hotplug-support property
+ */
+ hotplug_handler_pre_plug(pcms->acpi_dev, dev, errp);
+
if (is_nvdimm && !pcms->acpi_nvdimm_state.is_enabled) {
error_setg(errp, "nvdimm is not enabled: missing 'nvdimm' in '-M'");
return;
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index e692b9fdc1..ac44aa53be 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -805,6 +805,7 @@ static void ich9_lpc_class_init(ObjectClass *klass, void
*data)
* pc_q35_init()
*/
dc->user_creatable = false;
+ hc->pre_plug = ich9_pm_device_pre_plug_cb;
hc->plug = ich9_pm_device_plug_cb;
hc->unplug_request = ich9_pm_device_unplug_request_cb;
hc->unplug = ich9_pm_device_unplug_cb;
diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index 59aeb06393..428af0b0be 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -74,6 +74,8 @@ extern const VMStateDescription vmstate_ich9_pm;
void ich9_pm_add_properties(Object *obj, ICH9LPCPMRegs *pm, Error **errp);
+void ich9_pm_device_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
+ Error **errp);
void ich9_pm_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp);
void ich9_pm_device_unplug_request_cb(HotplugHandler *hotplug_dev,
--
2.19.1
- [Qemu-devel] [PATCH v3] i386, acpi: check acpi_memory_hotplug capacity in pre_plug,
Wei Yang <=