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=head1 NAME
xen-pci-device-reservations - Xen PCI device ID registry
=head1 Description
PCI vendor ID 0x5853 has been reserved for use by Xen systems in order to
advertise certain virtual hardware to guest virtual machines. The primary
use of this is with device ID 0x0001 to advertise the Xen Platform PCI
device - the presence of this virtual device enables a guest Operating
System (subject to the availability of suitable drivers) to make use of
paravirtualisation features such as disk and network devices etc.
Some Xen vendors wish to provide alternative and/or additional guest drivers
that can bind to virtual devices[1]. This may be done using the Xen PCI
vendor ID of 0x5853 and Xen-vendor/device specific PCI device IDs. This file
records reservations made within the device ID range in order to avoid
multiple Xen vendors using conflicting IDs.
=head1 Guidelines
=over 4
=item 1. A vendor may request a range of device IDs by submitting a patch to
this file.
=item 2. Vendor allocations should be in the range 0xc000-0xfffe to reduce the
possibility of clashes with community IDs assigned from the bottom up.
=item 3. The vendor is responsible for allocations within the range and should
try to record specific device IDs in PCI ID databases such as
https://pci-ids.ucw.cz and https://devicehunt.com
=back
=head1 Reservations
range | vendor/product
--------------+--------------------------------------------------------------
0x0001 | (Xen Platform PCI device)
0x0002 | Citrix XenServer (grandfathered allocation for XenServer 6.1)
0xc000-0xc0ff | Citrix XenServer
0xc100-0xc1ff | Citrix XenClient
0xc200-0xc2ff | XCP-ng Project (https://xcp-ng.org)
=head1 Notes
=over 4
=item 1.
Upstream QEMU provides a parameterized device called xen-pvdevice that
can be used to host guest drivers. Execute:
qemu-system-i386 -device xen-pvdevice,help
for a list of all parameters. The following parameters are relevant to
driver binding:
=over 4
=item vendor-id (default 0x5853)
The PCI vendor ID and subsystem vendor ID of the device.
=item device-id (must be specified)
The PCI device ID and subsystem device ID of the device.
=item revision (default 0x01)
The PCI revision of the device
=back
Also the size parameter (default 0x400000) can be used to specify the
size of the single MMIO BAR that the device exposes. This area may be
used by drivers for mapping grant tables, etc.
Note that the presence of the Xen Platform PCI device is generally a
pre-requisite for an additional xen-pvdevice as it is the platform
device that provides that IO ports necessary for unplugging emulated
devices. See hvm-emulated-unplug.markdown for details of the IO ports
and unplug protocol.
libxl provides support for creation of a single additional xen-pvdevice.
See the vendor_device parameter in xl.cfg(5).
=back
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