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docs: Add some details on XenServer PCI devices
Describe the usage of devices 5853:0002 and 5853:C000. Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com> Reviewed-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
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Frediano Ziglio authored and Jan Beulich committed
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@@ -10,6 +10,9 @@ use of this is with device ID 0x0001 to advertise the Xen Platform PCI
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device - the presence of this virtual device enables a guest Operating
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System (subject to the availability of suitable drivers) to make use of
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paravirtualisation features such as disk and network devices etc.
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XenServer, for Windows machines, may present Xen Platform device with device
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ID 0x0002 instead of 0x0001. Device 0x0001 and 0x0002 should be mutually
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exclusive.
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Some Xen vendors wish to provide alternative and/or additional guest drivers
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that can bind to virtual devices[1]. This may be done using the Xen PCI
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@@ -86,4 +89,8 @@ and unplug protocol.
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libxl provides support for creation of a single additional xen-pvdevice.
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See the vendor_device parameter in xl.cfg(5).
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XenServer might present a xen-pvdevice device with ID 0xC000.
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Such device is a placeholder for Windows update usage and is always exposed
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in conjunction with a Xen Platform PCI device, usually with ID 0x0002
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=back
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