From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Roedel, Joerg" <Joerg.Roedel@amd.com>
Subject: Re: kvm PCI assignment & VFIO ramblings
Date: Mon, 22 Aug 2011 14:55:02 +0200
Message-ID: <20110822125502.GF2079@amd.com>
References: <20110803020422.GF29719@yookeroo.fritz.box>
 <4E3F9E33.5000706@redhat.com>
 <1312932258.4524.55.camel@bling.home>
 <1312944513.29273.28.camel@pasglop>
 <1313859105.6866.192.camel@x201.home>
 <4E51F782.7060005@redhat.com>
 <20110822104635.GC2079@amd.com>
 <4E5234B7.7000700@redhat.com>
 <20110822123651.GD2079@amd.com>
 <4E524EBB.8090603@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Cc: Alex Williamson <alex.williamson@redhat.com>,
	chrisw <chrisw@sous-sol.org>,
	Alexey Kardashevskiy <aik@au1.ibm.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Paul Mackerras <pmac@au1.ibm.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	qemu-devel <qemu-devel@nongnu.org>,
	iommu <iommu@lists.linux-foundation.org>,
	Anthony Liguori <anthony@codemonkey.ws>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	"benve@cisco.com" <benve@cisco.com>
To: Avi Kivity <avi@redhat.com>
Return-path: <linux-pci-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <4E524EBB.8090603@redhat.com>
Sender: linux-pci-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On Mon, Aug 22, 2011 at 08:42:35AM -0400, Avi Kivity wrote:
> On 08/22/2011 03:36 PM, Roedel, Joerg wrote:
> > On the AMD IOMMU side this information is stored in the IVRS ACPI table.
> > Not sure about the VT-d side, though.
> 
> I see.  There is no sysfs node representing it?

No. It also doesn't exist as a 'struct pci_dev'. This caused problems in
the AMD IOMMU driver in the past and I needed to fix that. There I know
that from :)

> I'd rather not add another meaningless identifier.

Well, I don't think its really meaningless, but we need some way to
communicate the information about device groups to userspace.

	Joerg

-- 
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632