Re: [Xen-users] Trouble with PCI Passthrough

[David Escott <david.escott@xxxxxxxxxxxxxxxx>]

Casey,

Not sure how to read this. Is 01.0-[01] and 01.1-[02] indicative they
are behind the switch 01.*? That would make the most sense (and be the
most frustrating... how is a consumer to know what the PCI layout of
the motherboard is until they open the box?).

-[0000:00]-+-00.0  Intel Corporation Ivy Bridge DRAM Controller
           +-01.0-[01]--+-00.0  ATI Technologies Inc RV630 [Radeon HD 2600XT]
           |            \-00.1  ATI Technologies Inc RV630/M76 audio
device [Radeon HD 2600 Series]
           +-01.1-[02]--+-00.0  ATI Technologies Inc Device 6819
           |            \-00.1  ATI Technologies Inc Device aab0


The motherboard is an MSI Z77A-G45.

On Sat, Oct 6, 2012 at 2:48 PM, Casey DeLorme <cdelorme@xxxxxxxxx> wrote:
> In your situation, here are the points I would investigate:
>
> What model is your motherboard?  Have you used lspci -tv to see whether or
> not your cards are behind a PCI Switch perhaps?  While NF200 chips are not
> compatible, PLX seems to be, but it'll attempt to pass all devices behind
> it.
>
> Is it possible when you installed drivers it was only setup for the 2600?
> Have you tried a fresh installation of Windows 7, and passing just the HD
> 7850 after the installation is completed?
>
> Do your logs have anything special when you pass the HD 7850 solo to the
> HVM?  If you run "xl -vvv create" with one then both cards, how does the
> output differ?
>
> On Sat, Oct 6, 2012 at 2:34 PM, David Escott <david.escott@xxxxxxxxxxxxxxxx>
> wrote:
>>
>> Passthrough seems to be the most common problem, but I don't know enough
>> of
>> the voodoo magic to understand where to start investigating my issue,
>> which is that passthrough works but only when passing through multiple
>> devices:
>>
>> dom0: Fedora 17 with stock XEN (a later 4.1 version and a 3.5 kernel)
>> Hardware: VT-d capable MSI Z77 w/ i7-3770
>> Graphics cards:
>>       Intel HD 4000 IGD set as primary in the bios and used by dom0
>>       Radeon HD2600XT (from 2005ish) PCI-E slot 1, PCI 0000:01:00.[0,1]
>>       Radeon 7850 (brand new)              PCI-E slot 3, PCI
>> 0000:02:00.[0,1]
>>
>> What works:
>>     dom0 with the HD4000 IGD
>>     domU Windows 7 when both Radeon cards are passed through
>>               ie stubbing out 0000:01:00.[0-1] and 0000:02:00.[0-1]
>> and giving both to Win7
>>
>> What doesn't work (and what I dont understand):
>>     domU Win7 when only one of the two devices is passed to Windows
>> (in which case I get the error 43) [tried it both ways, passing only
>> the 2600 or only the 7850, and same error either way]
>>
>> Given that passthrough works, I dont understand why it would not work
>> when I only pass one of the devices. Is there something I should be
>> looking at (DMA ranges? IRQs?) to determine what linkage there is
>> between these two devices?
>>
>> Thanks,
>> David
>>
>> --
>> David Wright Escott
>> A comathematician turns cotheorems into phi.
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-users
>
>



-- 
David Wright Escott
A comathematician turns cotheorems into phi.

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