Re: [Xen-API] PCI passthrough - XCP vs XenServer

[Phill Edwards <philledwards@xxxxxxxxx>]

> My advice is to give it a go, and report back to the list on what works (and 
> what doesn't). To request a device passthrough,
> you'll need to add an "other-config" "pci" key via the CLI, naming the bus, 
> device and function you want to passthrough. Try
> something like:
>
> xe vm-param-set uuid=... 
> other-config:pci=0/0000:bus:dev.fun,1/0000:bus:dev.fun2
>
> Be careful to always pass through all functions of multi-function devices 
> (some hardware doesn't like it when the functions
> are separated) and beware the code paths are different for HVM and PV. I 
> would recommend installing a modern Linux
> distro as HVM (easiest done in XenServer by using the "other install media" 
> template), and use that. For reference, I often
> use Ubuntu 12.04 but anything modern should be ok.

Thanks very much for this info, and to others on the list who also
replied - the info was great.

I've installed XCP 1.6 and now have a bare bones Ubuntu 12.04 MythTV
installation running on it. The output of lspci on my XCP host shows
this:

05:00.0 Multimedia video controller: Conexant Systems, Inc.
CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
05:00.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3
PCI Video and Audio Decoder [MPEG Port] (rev 05)
05:01.0 Multimedia video controller: Conexant Systems, Inc.
CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
05:01.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3
PCI Video and Audio Decoder [MPEG Port] (rev 05)
05:02.0 Ethernet controller: Intel Corporation 82546EB Gigabit
Ethernet Controller (Copper) (rev 01)
05:02.1 Ethernet controller: Intel Corporation 82546EB Gigabit
Ethernet Controller (Copper) (rev 01)

So I ran this command to try to pass through the 1st DVB-T multimedia
card which seems to have 2 functions:
# xe vm-param-set other-config:pci=0/0000:05:00.0,1/0000:05:00.2
uuid=7a1f3bcd-4b2d-4c10-5aa4-4238a48f011d

I can now see some output from lspci on my VM:
00:00.0 Multimedia video controller: Conexant Systems, Inc.
CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)

But I thought I would see _two_ lines of output as I tried to set two
on the command line on the XCP host (one for 05:00.0 and another for
05:00.2) . Did I get something wrong with the command I ran on the XCP
host?

Also, if I need to "undo" the xe vm-param-set command, how do I do
that (so I can try some other variations of the command)?


> What kind of DVB-T tuners have you got? I was considering something similar 
> myself with one of mine.

I've got K-World DVB-T tuners. I'm in Australia so not sure if they
would work in USA.

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