From: Scott Wood <scottwood@freescale.com>
To: Bhushan Bharat-R65777 <R65777@freescale.com>
Cc: "chrisw@sous-sol.org" <chrisw@sous-sol.org>,
Wood Scott-B07421 <B07421@freescale.com>,
Alexey Kardashevskiy <aik@au1.ibm.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Stuart Yoder <b08248@gmail.com>,
"joerg.roedel@amd.com" <joerg.roedel@amd.com>,
"agraf@suse.de" <agraf@suse.de>,
"pmac@au1.ibm.com" <pmac@au1.ibm.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
"aafabbri@cisco.com" <aafabbri@cisco.com>,
Yoder Stuart-B08248 <B08248@freescale.com>,
Alex Williamson <alex.williamson@redhat.com>,
"avi@redhat.com" <avi@redhat.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"dwg@au1.ibm.com" <dwg@au1.ibm.com>,
"benve@cisco.com" <benve@cisco.com>
Subject: Re: [Qemu-devel] [RFC PATCH] vfio: VFIO Driver core framework
Date: Fri, 2 Dec 2011 12:52:34 -0600 [thread overview]
Message-ID: <4ED91E72.9040303@freescale.com> (raw)
In-Reply-To: <B8D6CA50DACE9E4AAADE9A4D56FBAAE62BCAE8@039-SN1MPN1-004.039d.mgd.msft.net>
On 12/02/2011 12:45 PM, Bhushan Bharat-R65777 wrote:
> Scott, I am not sure if there is any real use case where device needed to assigned beyond 2 level (host + immediate guest) in nested virtualization.
Userspace drivers in the guest is a more likely scenario than nested
virtualization, at least for us. Our hardware doesn't support nested
virtualization, so it would have to be some slow emulation-based
approach (worse than e500v2, since we don't have multiple PID registers).
> But if there any exists then will not it be better to virtualizes the iommu (PAMU for Freescale)?
We can't virtualize the PAMU in any sort of transparent manner. It's
not flexible enough to handle arbitrary mappings. The guest will need
to cooperate with the host to figure out what mappings it can do.
-Scott
next prev parent reply other threads:[~2011-12-02 18:52 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-03 20:12 [Qemu-devel] [RFC PATCH] vfio: VFIO Driver core framework Alex Williamson
2011-11-09 4:17 ` Aaron Fabbri
2011-11-09 4:41 ` Alex Williamson
2011-11-09 8:11 ` Christian Benvenuti (benve)
2011-11-09 18:02 ` Alex Williamson
2011-11-09 21:08 ` Christian Benvenuti (benve)
2011-11-09 23:40 ` Alex Williamson
2011-11-10 0:57 ` Christian Benvenuti (benve)
2011-11-11 18:04 ` Alex Williamson
2011-11-11 22:22 ` Christian Benvenuti (benve)
2011-11-14 22:59 ` Alex Williamson
2011-11-15 0:05 ` David Gibson
2011-11-15 0:49 ` Benjamin Herrenschmidt
2011-11-11 17:51 ` Konrad Rzeszutek Wilk
2011-11-11 22:10 ` Alex Williamson
2011-11-15 0:00 ` David Gibson
2011-11-16 16:52 ` Konrad Rzeszutek Wilk
2011-11-17 20:22 ` Alex Williamson
2011-11-17 20:56 ` Scott Wood
2011-11-16 17:47 ` Scott Wood
2011-11-17 20:52 ` Alex Williamson
2011-11-12 0:14 ` Scott Wood
2011-11-14 20:54 ` Alex Williamson
2011-11-14 21:46 ` Alex Williamson
2011-11-14 22:26 ` Scott Wood
2011-11-14 22:48 ` Alexander Graf
2011-11-15 2:29 ` Alex Williamson
2011-11-15 6:34 ` David Gibson
2011-11-15 18:01 ` Alex Williamson
2011-11-17 0:02 ` David Gibson
2011-11-18 20:32 ` Alex Williamson
2011-11-18 21:09 ` Scott Wood
2011-11-22 19:16 ` Alex Williamson
2011-11-22 20:00 ` Scott Wood
2011-11-22 21:28 ` Alex Williamson
2011-11-21 2:47 ` David Gibson
2011-11-22 18:22 ` Alex Williamson
2011-11-15 20:10 ` Scott Wood
2011-11-15 21:40 ` Aaron Fabbri
2011-11-15 22:29 ` Scott Wood
2011-11-16 23:34 ` Alex Williamson
2011-11-29 1:52 ` Alexey Kardashevskiy
2011-11-29 2:01 ` Alexey Kardashevskiy
2011-11-29 2:11 ` Alexey Kardashevskiy
2011-11-29 3:54 ` Alex Williamson
2011-11-29 19:26 ` Alex Williamson
2011-11-29 23:20 ` Stuart Yoder
2011-11-29 23:44 ` Alex Williamson
2011-11-30 15:41 ` Stuart Yoder
2011-11-30 16:58 ` Alex Williamson
2011-12-01 20:58 ` Stuart Yoder
2011-12-01 21:25 ` Alex Williamson
2011-12-02 14:40 ` Stuart Yoder
2011-12-02 18:11 ` Bhushan Bharat-R65777
2011-12-02 18:27 ` Scott Wood
2011-12-02 18:35 ` Bhushan Bharat-R65777
2011-12-02 18:45 ` Bhushan Bharat-R65777
2011-12-02 18:52 ` Scott Wood [this message]
2011-12-02 18:21 ` Scott Wood
2011-11-29 3:46 ` Alex Williamson
2011-11-29 4:34 ` Alexey Kardashevskiy
2011-11-29 5:48 ` Alex Williamson
2011-12-02 5:06 ` Alexey Kardashevskiy
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