Re: [Xen-users] DVB tuner not working in PV guest

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Steve Allison wrote:

> I'm using a similar card.
>
> Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
>
> Simply booting up in Xen on the dom0 rendered the card unable to 
> scan for channels. It would load its drivers, create its block 
> devices and seem to function in all aspects except for tuning, 
> basically rendering it useless.
> I had the same idea as you and was trying to get a PV mythtv 
> backend, after it failing in domU, I moved to just trying to get it 
> to work on the dom0 but was suffering the same issues.
> I was using the w-scan debian package to scan for channels without 
> needing to install Myth for testing and found that in a standard 
> *-xen kernel it worked fine, but if I loaded xen dom0 with the same 
> kernel, it didn't.
I found the card worked in Dom0 with Xen loaded. After some trial and 
error I realised I'd made two mistakes in my config.
1) I'd used "pciback.hide ..." instead of the newer "xen-pciback.hide 
..." loading Dom0 kernel.
2) Then in DomU I needed to use "iommu=soft" and not "swiotlb=force"


--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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