Re: Xen 4.2.0-rc4 issues with DVB tuner

[Konrad Rzeszutek Wilk <konrad@kernel.org>]

On Sun, Sep 16, 2012 at 04:57:16PM +0200, Javier Marcet wrote:
> On Fri, Sep 14, 2012 at 10:47 PM, Konrad Rzeszutek Wilk
> <konrad@kernel.org> wrote:
> 
> >> This last point is a showstopper for me and I don´t know where the
> >> problem might come from. The cx23885 module (which my tuners use)
> >> loads fine, as do the devices under /dev/dvb. Upon tuning a channel,
> >> however, there is not data received.
> >>
> >> Does anyone have the slightest idea what might be causing this?
> >
> > Are there any warnings or such being printed? Are the interrupts increasing?
> > Does lspci show anything 'disabled' in the guest?
> 
> You have misunderstood me. I was trying to access the dvb tuners from the dom0.

Ah.
> 
> Using kvm I have sucessfully passthrough a sata controller, but have some issues
> passin through the dvb tuner.
> 
> >> I wonder whether it would work within a DomU with the PCIe tuner
> >> passed through.
> >
> > I've a 4 channel security card passed in and it works nicely. The
> > trick is that you need 'iommu=soft' on the domU command line.
> 
> All right. But is it normal that it does not work under the dom0?

No. PV domU and PV dom0 are pretty much the same in the way of handling
interrupts, ports, etc.

If you crank up the debug level of the kernel (debug loglevel=8) and
of the driver do you get anything obvious? What about the questions
I've asked?

> The same kernel running on bare metal has no problems.
> 
> 
> -- 
> Javier Marcet <jmarcet@gmail.com>
>