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pc: Factor out (un)plug handling of virtio-md-pci devices

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Let's factor out (un)plug handling, to be reused from arm/virt code.

Provide stubs for the case that CONFIG_VIRTIO_MD is not selected because
neither virtio-mem nor virtio-pmem is enabled. While this cannot
currently happen for x86, it will be possible for arm/virt.

Message-ID: <20230711153445.514112-3-david@redhat.com>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2023-07-11 17:34:40 +02:00
parent 18129c15bc
commit dbdf841b2e
6 changed files with 106 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
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@ -2234,6 +2234,7 @@ M: David Hildenbrand <david@redhat.com>
S: Supported
F: hw/virtio/virtio-md-pci.c
F: include/hw/virtio/virtio-md-pci.h
F: stubs/virtio-md-pci.c
virtio-mem
M: David Hildenbrand <david@redhat.com>

90
hw/i386/pc.c
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@ -88,13 +88,11 @@
#include "hw/net/ne2000-isa.h"
#include "standard-headers/asm-x86/bootparam.h"
#include "hw/virtio/virtio-iommu.h"
#include "hw/virtio/virtio-pmem-pci.h"
#include "hw/virtio/virtio-mem-pci.h"
#include "hw/virtio/virtio-md-pci.h"
#include "hw/i386/kvm/xen_overlay.h"
#include "hw/i386/kvm/xen_evtchn.h"
#include "hw/i386/kvm/xen_gnttab.h"
#include "hw/i386/kvm/xen_xenstore.h"
#include "hw/mem/memory-device.h"
#include "sysemu/replay.h"
#include "target/i386/cpu.h"
#include "e820_memory_layout.h"
@ -1493,68 +1491,6 @@ static void pc_memory_unplug(HotplugHandler *hotplug_dev,
error_propagate(errp, local_err);
}
static void pc_virtio_md_pci_pre_plug(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
HotplugHandler *hotplug_dev2 = qdev_get_bus_hotplug_handler(dev);
Error *local_err = NULL;
if (!hotplug_dev2 && dev->hotplugged) {
/*
* Without a bus hotplug handler, we cannot control the plug/unplug
* order. We should never reach this point when hotplugging on x86,
* however, better add a safety net.
*/
error_setg(errp, "hotplug of virtio based memory devices not supported"
" on this bus.");
return;
}
/*
* First, see if we can plug this memory device at all. If that
* succeeds, branch of to the actual hotplug handler.
*/
memory_device_pre_plug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev), NULL,
&local_err);
if (!local_err && hotplug_dev2) {
hotplug_handler_pre_plug(hotplug_dev2, dev, &local_err);
}
error_propagate(errp, local_err);
}
static void pc_virtio_md_pci_plug(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
HotplugHandler *hotplug_dev2 = qdev_get_bus_hotplug_handler(dev);
Error *local_err = NULL;
/*
* Plug the memory device first and then branch off to the actual
* hotplug handler. If that one fails, we can easily undo the memory
* device bits.
*/
memory_device_plug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev));
if (hotplug_dev2) {
hotplug_handler_plug(hotplug_dev2, dev, &local_err);
if (local_err) {
memory_device_unplug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev));
}
}
error_propagate(errp, local_err);
}
static void pc_virtio_md_pci_unplug_request(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
/* We don't support hot unplug of virtio based memory devices */
error_setg(errp, "virtio based memory devices cannot be unplugged.");
}
static void pc_virtio_md_pci_unplug(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
/* We don't support hot unplug of virtio based memory devices */
}
static void pc_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
@ -1562,9 +1498,8 @@ static void pc_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
pc_memory_pre_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
x86_cpu_pre_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MEM_PCI)) {
pc_virtio_md_pci_pre_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
virtio_md_pci_pre_plug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI)) {
/* Declare the APIC range as the reserved MSI region */
char *resv_prop_str = g_strdup_printf("0xfee00000:0xfeefffff:%d",
@ -1596,9 +1531,8 @@ static void pc_machine_device_plug_cb(HotplugHandler *hotplug_dev,
pc_memory_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
x86_cpu_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MEM_PCI)) {
pc_virtio_md_pci_plug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
virtio_md_pci_plug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
}
}
@ -1609,9 +1543,9 @@ static void pc_machine_device_unplug_request_cb(HotplugHandler *hotplug_dev,
pc_memory_unplug_request(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
x86_cpu_unplug_request_cb(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MEM_PCI)) {
pc_virtio_md_pci_unplug_request(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
virtio_md_pci_unplug_request(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev),
errp);
} else {
error_setg(errp, "acpi: device unplug request for not supported device"
" type: %s", object_get_typename(OBJECT(dev)));
@ -1625,9 +1559,8 @@ static void pc_machine_device_unplug_cb(HotplugHandler *hotplug_dev,
pc_memory_unplug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
x86_cpu_unplug_cb(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MEM_PCI)) {
pc_virtio_md_pci_unplug(hotplug_dev, dev, errp);
} else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI)) {
virtio_md_pci_unplug(VIRTIO_MD_PCI(dev), MACHINE(hotplug_dev), errp);
} else {
error_setg(errp, "acpi: device unplug for not supported device"
" type: %s", object_get_typename(OBJECT(dev)));
@ -1639,8 +1572,7 @@ static HotplugHandler *pc_get_hotplug_handler(MachineState *machine,
{
if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
object_dynamic_cast(OBJECT(dev), TYPE_CPU) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MEM_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_MD_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_IOMMU_PCI) ||
object_dynamic_cast(OBJECT(dev), TYPE_X86_IOMMU_DEVICE)) {
return HOTPLUG_HANDLER(machine);

63
hw/virtio/virtio-md-pci.c
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@ -13,6 +13,69 @@
#include "qemu/osdep.h"
#include "hw/virtio/virtio-md-pci.h"
#include "hw/mem/memory-device.h"
#include "qapi/error.h"
void virtio_md_pci_pre_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp)
{
DeviceState *dev = DEVICE(vmd);
HotplugHandler *bus_handler = qdev_get_bus_hotplug_handler(dev);
MemoryDeviceState *md = MEMORY_DEVICE(vmd);
Error *local_err = NULL;
if (!bus_handler && dev->hotplugged) {
/*
* Without a bus hotplug handler, we cannot control the plug/unplug
* order. We should never reach this point when hotplugging on x86,
* however, better add a safety net.
*/
error_setg(errp, "hotplug of virtio based memory devices not supported"
" on this bus.");
return;
}
/*
* First, see if we can plug this memory device at all. If that
* succeeds, branch of to the actual hotplug handler.
*/
memory_device_pre_plug(md, ms, NULL, &local_err);
if (!local_err && bus_handler) {
hotplug_handler_pre_plug(bus_handler, dev, &local_err);
}
error_propagate(errp, local_err);
}
void virtio_md_pci_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp)
{
DeviceState *dev = DEVICE(vmd);
HotplugHandler *bus_handler = qdev_get_bus_hotplug_handler(dev);
MemoryDeviceState *md = MEMORY_DEVICE(vmd);
Error *local_err = NULL;
/*
* Plug the memory device first and then branch off to the actual
* hotplug handler. If that one fails, we can easily undo the memory
* device bits.
*/
memory_device_plug(md, ms);
if (bus_handler) {
hotplug_handler_plug(bus_handler, dev, &local_err);
if (local_err) {
memory_device_unplug(md, ms);
}
}
error_propagate(errp, local_err);
}
void virtio_md_pci_unplug_request(VirtIOMDPCI *vmd, MachineState *ms,
Error **errp)
{
/* We don't support hot unplug of virtio based memory devices */
error_setg(errp, "virtio based memory devices cannot be unplugged.");
}
void virtio_md_pci_unplug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp)
{
/* We don't support hot unplug of virtio based memory devices */
}
static const TypeInfo virtio_md_pci_info = {
.name = TYPE_VIRTIO_MD_PCI,

6
include/hw/virtio/virtio-md-pci.h
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@ -32,4 +32,10 @@ struct VirtIOMDPCI {
VirtIOPCIProxy parent_obj;
};
void virtio_md_pci_pre_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp);
void virtio_md_pci_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp);
void virtio_md_pci_unplug_request(VirtIOMDPCI *vmd, MachineState *ms,
Error **errp);
void virtio_md_pci_unplug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp);
#endif

1
stubs/meson.build
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@ -60,6 +60,7 @@ if have_system
stub_ss.add(files('semihost.c'))
stub_ss.add(files('usb-dev-stub.c'))
stub_ss.add(files('xen-hw-stub.c'))
stub_ss.add(files('virtio-md-pci.c'))
else
stub_ss.add(files('qdev.c'))
endif

24
stubs/virtio-md-pci.c Normal file
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@ -0,0 +1,24 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/virtio/virtio-md-pci.h"
void virtio_md_pci_pre_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp)
{
error_setg(errp, "virtio based memory devices not supported");
}
void virtio_md_pci_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp)
{
error_setg(errp, "virtio based memory devices not supported");
}
void virtio_md_pci_unplug_request(VirtIOMDPCI *vmd, MachineState *ms,
Error **errp)
{
error_setg(errp, "virtio based memory devices not supported");
}
void virtio_md_pci_unplug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp)
{
error_setg(errp, "virtio based memory devices not supported");
}