Re: [Xen-devel] Xen 4.4 development update: Is PVH a blocker?

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Dec 17, 2013 at 04:03:14PM +0100, Sander Eikelenboom wrote:
> 
> Tuesday, December 17, 2013, 3:35:45 PM, you wrote:
> 
> >> > rm -Rf tools/firmware/seabios-dir* tools/qemu-xen*
> >> > rebuilt and had the same issue :-(
> >> 
> >> Hmm so taking it forward doesn't cut it .. going back is probably going to 
> >> be searching for a needle in a haystack.
> >> Finding many incomptabilities. I tried it with vga passthrough to find 
> >> back a working config i knew i once had .. but to no avail :-(
> 
> > Yikes. Do you get a similar error message in QEMU?
> 
> Nope my problem (at present) is with the rom bar, that is special cased 
> around everywhere (hvmloader, seabios, qemu, guest kernel).
> And it appears all fine, but in fact in the guest it isn't backed by the 
> actual rom data (neither by a copy, neither by passing it through).
> 
> Already tried by letting hvmloader load it as a optionrom, but that didn't 
> cut it.
> 
> When dumping the rom of the devices passed through in the guest,
> i was seeing al kinds of romdata from the emulated devices at the address 
> given to the passed through devive,
> but not the romdata from the passedthrough device.
> 
> And that was when i stumbled upon the whole xen_platform_pci problem,
> as i was trying to switch of as many emulated devices as possible (in the 
> hope it was some interference between those.
> 
> After that tried KVM .. to see if it is in any way feasible and possible with 
> my system (iommu + gfx card),
> that resulted in almost instant succes .. so yes it should be possible ...

Yes. I would like it to work too. That is what I am trying to get working. And
neatly enough I can reproduce the problem you are seeing on my system.

I have some ideas of why it is happening but no concrete patches. Will
CC when I am ready.

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