Re: [PATCH v2] docs: Add some details on XenServer PCI devices

["Alejandro Vallejo" <alejandro.vallejo@cloud.com>]

On Tue Mar 4, 2025 at 1:22 PM GMT, Frediano Ziglio wrote:
> Describe the usage of devices 5853:0002 and 5853:C000.
>
> Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>
> ---
> Changes since v1:
> - address minor comments
> ---
>  docs/man/xen-pci-device-reservations.7.pod | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/docs/man/xen-pci-device-reservations.7.pod b/docs/man/xen-pci-device-reservations.7.pod
> index 9ddf3a18ad..adc325069c 100644
> --- a/docs/man/xen-pci-device-reservations.7.pod
> +++ b/docs/man/xen-pci-device-reservations.7.pod
> @@ -10,6 +10,9 @@ 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.
> +XenServer, for Windows machines, may present Xen Platform device with device
> +ID 0x0002 instead of 0x0001. Device 0x0001 and 0x0002 should be mutually
> +exclusive.
>  
>  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
> @@ -86,4 +89,8 @@ and unplug protocol.
>  libxl provides support for creation of a single additional xen-pvdevice.
>  See the vendor_device parameter in xl.cfg(5).
>  
> +XenServer might present a xen-pvdevice device with ID 0xC000.
> +Such device is a placeholder for Windows update usage and is always exposed
> +in conjunction with a Xen Platform PCI device, usually with ID 0x0002
> +
>  =back

LGTM

  Reviewed-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>

Cheers,
Alejandro