Re: AMD KVM Pci Passthrough reports device busy

From: Andreas Hartmann <andihartmann@01019freenet.de>
To: Joerg Roedel <Joerg.Roedel@amd.com>,
	Alex Williamson <alex.williamson@redhat.com>
Cc: Chris Sanders <sanders.chris@gmail.com>, kvm@vger.kernel.org
Subject: Re: AMD KVM Pci Passthrough reports device busy
Date: Wed, 11 Jul 2012 21:32:05 +0200	[thread overview]
Message-ID: <4FFDD4B5.6080304@01019freenet.de> (raw)
In-Reply-To: <20120711165854.GM25282@amd.com>

Hello Joerg,

Joerg Roedel wrote:
> Hi Andreas,
> 
> On Wed, Jul 11, 2012 at 04:26:30PM +0200, Andreas Hartmann wrote:
>> 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:
> 
> Good news: I actually found the right person to ask and the answer is,
>      that peer-to-peer communication between these devices is not
>      possible. So it is safe to pass them through to guests
>      individually.

This is really good news! Thank you very much for your support! This
makes this chipset really useful for users who want to passthrough PCI
devices to a VM without loosing other functions used on the host.

Your information confirms the result of the individual tests I already did.

@Alex:
Could you please send this patch upstream now:

http://news.gmane.org/find-root.php?group=gmane.linux.kernel&article=1310198

Thank you,
kind regards,
Andreas