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add pci-bridge-seat 

Simplifies multiseat configuration, see
docs/multiseat.txt update for details.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gerd Hoffmann 2015-06-18 12:17:29 +02:00 committed by Michael S. Tsirkin
parent 72d97b3a54
commit eb6c6a6048
4 changed files with 45 additions and 1 deletions
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19
docs/multiseat.txt
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@ -106,6 +106,25 @@ the devices attached to the seat.
Background info is here:
http://www.freedesktop.org/wiki/Software/systemd/multiseat/
guest side with pci-bridge-seat
-------------------------------
Qemu version FIXME and newer has a new pci-bridge-seat device which
can be used instead of pci-bridge. Just swap the device name in the
qemu command line above. The only difference between the two devices
is the pci id. We can match the pci id instead of the device path
with a nice generic rule now, which simplifies the guest
configuration:
[root@fedora ~]# cat /etc/udev/rules.d/70-qemu-pci-bridge-seat.rules
SUBSYSTEM=="pci", ATTR{vendor}=="0x1b36", ATTR{device}=="0x000a", \
TAG+="seat", ENV{ID_AUTOSEAT}="1"
Patch with this rule will be submitted to upstream udev/systemd, so
long-term, when systemd with this lands in distros, things will work
just fine without any manual guest configuration.
Enjoy!
--

1
docs/specs/pci-ids.txt
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@ -47,6 +47,7 @@ PCI devices (other than virtio):
1b36:0005 PCI test device (docs/specs/pci-testdev.txt)
1b36:0006 PCI Rocker Ethernet switch device
1b36:0007 PCI SD Card Host Controller Interface (SDHCI)
1b36:000a PCI-PCI bridge (multiseat)
All these devices are documented in docs/specs.

25
hw/pci-bridge/pci_bridge_dev.c
View File

@ -28,7 +28,8 @@
#include "hw/pci/pci_bus.h"
#include "hw/hotplug.h"
#define TYPE_PCI_BRIDGE_DEV "pci-bridge"
#define TYPE_PCI_BRIDGE_DEV "pci-bridge"
#define TYPE_PCI_BRIDGE_SEAT_DEV "pci-bridge-seat"
#define PCI_BRIDGE_DEV(obj) \
OBJECT_CHECK(PCIBridgeDev, (obj), TYPE_PCI_BRIDGE_DEV)
@ -170,9 +171,31 @@ static const TypeInfo pci_bridge_dev_info = {
}
};
/*
* Multiseat bridge. Same as the standard pci bridge, only with a
* different pci id, so we can match it easily in the guest for
* automagic multiseat configuration. See docs/multiseat.txt for more.
*/
static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT;
dc->desc = "Standard PCI Bridge (multiseat)";
}
static const TypeInfo pci_bridge_dev_seat_info = {
.name = TYPE_PCI_BRIDGE_SEAT_DEV,
.parent = TYPE_PCI_BRIDGE_DEV,
.instance_size = sizeof(PCIBridgeDev),
.class_init = pci_bridge_dev_seat_class_init,
};
static void pci_bridge_dev_register(void)
{
type_register_static(&pci_bridge_dev_info);
type_register_static(&pci_bridge_dev_seat_info);
}
type_init(pci_bridge_dev_register);

1
include/hw/pci/pci.h
View File

@ -92,6 +92,7 @@
#define PCI_DEVICE_ID_REDHAT_SDHCI 0x0007
#define PCI_DEVICE_ID_REDHAT_PCIE_HOST 0x0008
#define PCI_DEVICE_ID_REDHAT_PXB 0x0009
#define PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT 0x000a
#define PCI_DEVICE_ID_REDHAT_QXL 0x0100
#define FMT_PCIBUS PRIx64