Re: [Xen-users] pci passthrough with multiple devices

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-08-10 at 18:03 +0100, Gabor Hudiczius wrote:
> > thanks, it works perfectly with the latest 4.2 (4.2.0-rc2-pre)
> 
> Hi,
> 
> well, it's not quite perfect...
> 
> When i try to set a maxmem value different from the memory value, the 
> guest doesn't start

I think this is probably/likely a kernel issue (so I've CC'd Konrad)
Setting "host_e820=1" in the guest cfg might help, but I've a feeling it
happens automagically if you specify "pci = " so perhaps not.

You might need swiotlb=force too, Konrad can probably best advise.

I'd be useful to see the actual kernel logs from both the success and
failure case. I set "XENCONSOLED_TRACE=guest"
in /etc/{sysconfig,default}/xencommon (which one you have depends on
distro) and mkdir /var/log/xen/console, after restarting xenconsoled you
should get a log file for each guest.


> Other guests work fine, and this one starts too, when i delete either 
> the pci or the maxmem settings, or when i set the maxmem value equal to 
> the memory value.
> 
> I attach the guest config (rita), the xl log (xl-rita.log), and the 
> output of both a successful (rita-start-success) and a failed 
> (rita-start-failure) create attempt (xl -vvv create rita).
> 
> Both xm create and xm mem-set works.
> 
> Regards,
> Gabor Hudiczius



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