Re: AMD KVM Pci Passthrough reports device busy

From: Joerg Roedel <Joerg.Roedel@amd.com>
To: Andreas Hartmann <andihartmann@01019freenet.de>
Cc: Alex Williamson <alex.williamson@redhat.com>,
	Chris Sanders <sanders.chris@gmail.com>, <kvm@vger.kernel.org>
Subject: Re: AMD KVM Pci Passthrough reports device busy
Date: Mon, 25 Jun 2012 13:22:53 +0200	[thread overview]
Message-ID: <20120625112253.GT2624@amd.com> (raw)
In-Reply-To: <201206250555.q5P5ttZ4002091@mail.maya.org>

On Mon, Jun 25, 2012 at 07:55:55AM +0200, Andreas Hartmann wrote:
> Hello Joerg,
> 
> Joerg Roedel wrote:
> > On Tue, Jun 05, 2012 at 08:27:05AM -0600, Alex Williamson wrote:
> >> Joerg, the question is whether the multifunction device above allows
> >> peer-to-peer between functions that could bypass the iommu.  If not, we
> >> can make it the first entry in device specific acs enabled function I
> >> proposed:
> >>
> >> https://lkml.org/lkml/2012/5/30/438
> >>
> >> and it would greatly simplify assigning PCI devices on these systems
> >> with VFIO.  Thanks,
> > 
> > Hm, good question. I will ask around and let you know what I find out.
> 
> May I please ask, if you meanwhile could get any information about
> potential peer-to-peer communication between the functions of the
> following multifunction device:
> 
> 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])
> 
> 00:14.0 0c05: 1002:4385 (rev 42)
> 00:14.1 0101: 1002:439c (rev 40)
> 00:14.2 0403: 1002:4383 (rev 40)
> 00:14.3 0601: 1002:439d (rev 40)
> 00:14.4 0604: 1002:4384 (rev 40)
> 00:14.5 0c03: 1002:4399

I asked the 'supposed-to-be-resonsible-person' but didn't get a resonse
so far. I will ping them again.

	Joerg

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