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

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Tuesday, December 17, 2013, 10:35:38 PM, you wrote:

> 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.

Ok thx :-)


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