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[RFC v1] arm/virt: Add memory hot remove support
From: |
Shameer Kolothum |
Subject: |
[RFC v1] arm/virt: Add memory hot remove support |
Date: |
Wed, 18 Mar 2020 12:37:22 +0000 |
This adds support for memory hot remove on arm/virt that
uses acpi ged device.
Signed-off-by: Shameer Kolothum <address@hidden>
---
-RFC because linux kernel support for mem hot remove is just queued
for 5.7[1].
-Tested with guest kernel 5.6-rc5 + [1]
1. https://patchwork.kernel.org/cover/11419301/
---
hw/acpi/generic_event_device.c | 28 +++++++++++++++++
hw/arm/virt.c | 56 ++++++++++++++++++++++++++++++++--
2 files changed, 82 insertions(+), 2 deletions(-)
diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index 021ed2bf23..3e28c110fa 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -182,6 +182,32 @@ static void acpi_ged_device_plug_cb(HotplugHandler
*hotplug_dev,
}
}
+static void acpi_ged_unplug_request_cb(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ AcpiGedState *s = ACPI_GED(hotplug_dev);
+
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+ acpi_memory_unplug_request_cb(hotplug_dev, &s->memhp_state, dev, errp);
+ } else {
+ error_setg(errp, "acpi: device unplug request for unsupported device"
+ " type: %s", object_get_typename(OBJECT(dev)));
+ }
+}
+
+static void acpi_ged_unplug_cb(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ AcpiGedState *s = ACPI_GED(hotplug_dev);
+
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+ acpi_memory_unplug_cb(&s->memhp_state, dev, errp);
+ } else {
+ error_setg(errp, "acpi: device unplug for unsupported device"
+ " type: %s", object_get_typename(OBJECT(dev)));
+ }
+}
+
static void acpi_ged_send_event(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
{
AcpiGedState *s = ACPI_GED(adev);
@@ -286,6 +312,8 @@ static void acpi_ged_class_init(ObjectClass *class, void
*data)
dc->vmsd = &vmstate_acpi_ged;
hc->plug = acpi_ged_device_plug_cb;
+ hc->unplug_request = acpi_ged_unplug_request_cb;
+ hc->unplug = acpi_ged_unplug_cb;
adevc->send_event = acpi_ged_send_event;
}
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 94f93dda54..91974e4e80 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2096,11 +2096,62 @@ static void virt_machine_device_plug_cb(HotplugHandler
*hotplug_dev,
}
}
+static void virt_dimm_unplug_request(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
+ Error *local_err = NULL;
+
+ if (!vms->acpi_dev) {
+ error_setg(errp,
+ "memory hotplug is not enabled: missing acpi-ged device");
+ goto out;
+ }
+
+ hotplug_handler_unplug_request(HOTPLUG_HANDLER(vms->acpi_dev), dev,
+ &local_err);
+out:
+ error_propagate(errp, local_err);
+}
+
+static void virt_dimm_unplug(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
+ Error *local_err = NULL;
+
+ hotplug_handler_unplug(HOTPLUG_HANDLER(vms->acpi_dev), dev, &local_err);
+ if (local_err) {
+ goto out;
+ }
+
+ pc_dimm_unplug(PC_DIMM(dev), MACHINE(vms));
+ object_property_set_bool(OBJECT(dev), false, "realized", NULL);
+
+ out:
+ error_propagate(errp, local_err);
+}
+
static void virt_machine_device_unplug_request_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
- error_setg(errp, "device unplug request for unsupported device"
- " type: %s", object_get_typename(OBJECT(dev)));
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+ virt_dimm_unplug_request(hotplug_dev, dev, errp);
+ } else {
+ error_setg(errp, "device unplug request for unsupported device"
+ " type: %s", object_get_typename(OBJECT(dev)));
+ }
+}
+
+static void virt_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
+ DeviceState *dev, Error **errp)
+{
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
+ virt_dimm_unplug(hotplug_dev, dev, errp);
+ } else {
+ error_setg(errp, "virt: device unplug for unsupported device"
+ " type: %s", object_get_typename(OBJECT(dev)));
+ }
}
static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
@@ -2181,6 +2232,7 @@ static void virt_machine_class_init(ObjectClass *oc, void
*data)
hc->pre_plug = virt_machine_device_pre_plug_cb;
hc->plug = virt_machine_device_plug_cb;
hc->unplug_request = virt_machine_device_unplug_request_cb;
+ hc->unplug = virt_machine_device_unplug_cb;
mc->numa_mem_supported = true;
mc->auto_enable_numa_with_memhp = true;
mc->default_ram_id = "mach-virt.ram";
--
2.17.1
- [RFC v1] arm/virt: Add memory hot remove support,
Shameer Kolothum <=