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hw/i386/pc: support '-nic' for xen-net-device

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The default NIC creation seems a bit hackish to me. I don't understand
why each platform has to call pci_nic_init_nofail() from a point in the
code where it actually has a pointer to the PCI bus, and then we have
the special cases for things like ne2k_isa.

If qmp_device_add() can *find* the appropriate bus and instantiate
the device on it, why can't we just do that from generic code for
creating the default NICs too?

But that isn't a yak I want to shave today. Add a xenbus field to the
PCMachineState so that it can make its way from pc_basic_device_init()
to pc_nic_init() and be handled as a special case like ne2k_isa is.

Now we can launch emulated Xen guests with '-nic user'.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2023-10-17 17:53:58 +01:00
parent 25967ff69f
commit c10b4b3c0d
6 changed files with 17 additions and 8 deletions
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11
hw/i386/pc.c
View file

@ -1261,7 +1261,7 @@ void pc_basic_device_init(struct PCMachineState *pcms,
if (pcms->bus) {
pci_create_simple(pcms->bus, -1, "xen-platform");
}
xen_bus_init();
pcms->xenbus = xen_bus_init();
xen_be_init();
}
#endif
@ -1289,7 +1289,8 @@ void pc_basic_device_init(struct PCMachineState *pcms,
pcms->vmport != ON_OFF_AUTO_ON);
}
void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus)
void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus,
BusState *xen_bus)
{
MachineClass *mc = MACHINE_CLASS(pcmc);
int i;
@ -1299,7 +1300,11 @@ void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus)
NICInfo *nd = &nd_table[i];
const char *model = nd->model ? nd->model : mc->default_nic;
if (g_str_equal(model, "ne2k_isa")) {
if (xen_bus && (!nd->model || g_str_equal(model, "xen-net-device"))) {
DeviceState *dev = qdev_new("xen-net-device");
qdev_set_nic_properties(dev, nd);
qdev_realize_and_unref(dev, xen_bus, &error_fatal);
} else if (g_str_equal(model, "ne2k_isa")) {
pc_init_ne2k_isa(isa_bus, nd);
} else {
pci_nic_init_nofail(nd, pci_bus, model, NULL);

2
hw/i386/pc_piix.c
View file

@ -342,7 +342,7 @@ static void pc_init1(MachineState *machine,
pc_basic_device_init(pcms, isa_bus, x86ms->gsi, rtc_state, true,
0x4);
pc_nic_init(pcmc, isa_bus, pci_bus);
pc_nic_init(pcmc, isa_bus, pci_bus, pcms->xenbus);
if (pcmc->pci_enabled) {
pc_cmos_init(pcms, idebus[0], idebus[1], rtc_state);

2
hw/i386/pc_q35.c
View file

@ -340,7 +340,7 @@ static void pc_q35_init(MachineState *machine)
/* the rest devices to which pci devfn is automatically assigned */
pc_vga_init(isa_bus, host_bus);
pc_nic_init(pcmc, isa_bus, host_bus);
pc_nic_init(pcmc, isa_bus, host_bus, pcms->xenbus);
if (machine->nvdimms_state->is_enabled) {
nvdimm_init_acpi_state(machine->nvdimms_state, system_io,

4
hw/xen/xen-bus.c
View file

@ -1133,11 +1133,13 @@ static void xen_register_types(void)
type_init(xen_register_types)
void xen_bus_init(void)
BusState *xen_bus_init(void)
{
DeviceState *dev = qdev_new(TYPE_XEN_BRIDGE);
BusState *bus = qbus_new(TYPE_XEN_BUS, dev, NULL);
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
qbus_set_bus_hotplug_handler(bus);
return bus;
}

4
include/hw/i386/pc.h
View file

@ -33,6 +33,7 @@ typedef struct PCMachineState {
/* Pointers to devices and objects: */
PCIBus *bus;
BusState *xenbus;
I2CBus *smbus;
PFlashCFI01 *flash[2];
ISADevice *pcspk;
@ -184,7 +185,8 @@ void pc_basic_device_init(struct PCMachineState *pcms,
void pc_cmos_init(PCMachineState *pcms,
BusState *ide0, BusState *ide1,
ISADevice *s);
void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus);
void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus,
BusState *xen_bus);
void pc_i8259_create(ISABus *isa_bus, qemu_irq *i8259_irqs);

2
include/hw/xen/xen-bus.h
View file

@ -75,7 +75,7 @@ struct XenBusClass {
OBJECT_DECLARE_TYPE(XenBus, XenBusClass,
XEN_BUS)
void xen_bus_init(void);
BusState *xen_bus_init(void);
void xen_device_backend_set_state(XenDevice *xendev,
enum xenbus_state state);