linux-kernel - Re: [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated Graphics Passthrough Solution from Intel

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Message-ID: <564E8C51.6070706@intel.com>
Date:	Fri, 20 Nov 2015 10:58:25 +0800
From:	Jike Song <jike.song@...el.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"Tian, Kevin" <kevin.tian@...el.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"igvt-g@...1.01.org" <igvt-g@...1.01.org>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"White, Michael L" <michael.l.white@...el.com>,
	"Dong, Eddie" <eddie.dong@...el.com>,
	"Li, Susie" <susie.li@...el.com>,
	"Cowperthwaite, David J" <david.j.cowperthwaite@...el.com>,
	"Reddy, Raghuveer" <raghuveer.reddy@...el.com>,
	"Zhu, Libo" <libo.zhu@...el.com>,
	"Zhou, Chao" <chao.zhou@...el.com>,
	"Wang, Hongbo" <hongbo.wang@...el.com>,
	"Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
	qemu-devel <qemu-devel@...gnu.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gerd Hoffmann <kraxel@...hat.com>
Subject: Re: [Intel-gfx] [Announcement] 2015-Q3 release of XenGT - a Mediated
 Graphics Passthrough Solution from Intel

On 11/19/2015 11:52 PM, Alex Williamson wrote:
> On Thu, 2015-11-19 at 15:32 +0000, Stefano Stabellini wrote:
>> On Thu, 19 Nov 2015, Jike Song wrote:
>>> Hi Alex, thanks for the discussion.
>>>
>>> In addition to Kevin's replies, I have a high-level question: can VFIO
>>> be used by QEMU for both KVM and Xen?
>>
>> No. VFIO cannot be used with Xen today. When running on Xen, the IOMMU
>> is owned by Xen.
>
> Right, but in this case we're talking about device MMUs, which are owned
> by the device driver which I think is running in dom0, right?  This
> proposal doesn't require support of the system IOMMU, the dom0 driver
> maps IOVA translations just as it would for itself.  We're largely
> proposing use of the VFIO API to provide a common interface to expose a
> PCI(e) device to QEMU, but what happens in the vGPU vendor device and
> IOMMU backends is specific to the device and perhaps even specific to
> the hypervisor.  Thanks,

Let me conclude this, and please correct me in case of any misread: the
vGPU interface between kernel and QEMU will be through VFIO, with a new
VFIO backend (instead of the existing type1), for both KVMGT and XenGT?


>
> Alex
>

--
Thanks,
Jike
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