Re: AMD KVM Pci Passthrough reports device busy

[sheng qiu <herbert1984106@gmail.com>]

test

On Tue, Jun 5, 2012 at 5:39 AM, Andreas Hartmann
<andihartmann@01019freenet.de> wrote:
> Hello Alex,
>
> thanks for your efforts!
>
> Maybe, you already know that I'm suffering the same problem :-( with a
> GA-990XA-UD3 (990X chipset).
>
>
> On Mon, 04 Jun 2012 21:44:05 -0600
> Alex Williamson <alex.williamson@redhat.com> wrote:
> [...]
>> I have a setup with an AMD 990FX system and a spare PVR-350 card that I
>> installed to reproduce.  The sad answer is that it's nearly impossible
>> to assign PCI devices on these systems due to the aliasing of devices
>> below the PCIe-to-PCI bridge (PCIe devices are much, much easier to
>> assign).  If you boot with amd_iommu_dump, you'll see some output like
>> this:
>>
>> AMD-Vi:   DEV_ALIAS_RANGE              devid: 05:00.0 flags: 00 devid_to: 00:14.4
>> AMD-Vi:   DEV_RANGE_END                devid: 05:1f.7
>
> here:
> AMD-Vi:   DEV_ALIAS_RANGE         devid: 06:00.0 flags: 00 devid_to: 00:14.4
> AMD-Vi:   DEV_RANGE_END           devid: 06:1f.7
>
>
> This means according to your description, the following devices have to
> be unbound here, too (0000:06:07.0 is the device I want to passthrough):
>
> 0000:00:14.0 -> ../../../../devices/pci0000:00/0000:00:14.0
> 0000:00:14.1 -> ../../../../devices/pci0000:00/0000:00:14.1
> 0000:00:14.2 -> ../../../../devices/pci0000:00/0000:00:14.2
> 0000:00:14.3 -> ../../../../devices/pci0000:00/0000:00:14.3
> 0000:00:14.4 -> ../../../../devices/pci0000:00/0000:00:14.4
> 0000:00:14.5 -> ../../../../devices/pci0000:00/0000:00:14.5
> 0000:06:07.0 -> ../../../../devices/pci0000:00/0000:00:14.4/0000:06:07.0
>
>
> These are the following additional devices:
>
> 00:14.0 SMBus: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller (rev 42)
> 00:14.1 IDE interface: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 IDE Controller (rev 40) (prog-if 8a [Master SecP PriP])
> 00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
> 00:14.3 ISA bridge: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
> 00:14.4 PCI bridge: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge (rev 40) (prog-if 01 [Subtractive decode])
> 00:14.5 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI2 Controller (prog-if 10 [OHCI])
>
>
> Among them is the sound device and the USB device - no good idea to
> disable them on a desktop.
>
> Disabling 00:14.1 seems to be possible (rmmod pata_atiixp works), but
> I'm getting errors after rebooting the system (the filesystems haven't
> been cleanly unmounted during shutdown).
>
> Anyway, I would have tested it, but I'm getting a compile error while
> compiling qemu. It complains about missing pci/header.h while
> processing hw/vfio_pci.c:49:24. I can't find any pci/header.h. Where
> should it come from?
>
> [...]
>
>> The downside is that VFIO is strict about
>> multifunction devices supporting ACS to prevent peer-to-peer between
>> domains, so will require all of the 14.x devices to be bound to pci-stub
>> as well.  On my system, this includes an smbus controller, audio device,
>> lpc controller, and usb device.  If AMD could confirm this device
>> doesn't allow peer-to-peer between functions, we could relax this
>> requirement a bit.
>
> Please Joerg, could you take a look at this problem?
>
>
> Thanks,
> kind regards,
> Andreas
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-- 
Sheng Qiu
Texas A & M University
Room 332B Wisenbaker
email: herbert1984106@gmail.com
College Station, TX 77843-3259