GPU Passthrough without VT-d

GPU Passthrough without VT-d

[Dushyant Behl]

[-- Attachment #1.1: Type: text/plain, Size: 371 bytes --]

Hi all,

I am new to the xen community and I wanted to work on the project "Allowing
guests to boot with a passed-through GPU as the primary display" but the
processor in my system does not supports IO MMU Virtualization (Intel
VT-d), it only supports the Intel Virtualization (Intel VT-x). Would it be
possible for me to work on the project in anyway?

Thanks,
Dushyant

[-- Attachment #1.2: Type: text/html, Size: 465 bytes --]

[-- Attachment #2: Type: text/plain, Size: 126 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: GPU Passthrough without VT-d

[Kai Huang]

In general you cannot do pci passthrough for HVM without IOMMU (vt-d) 
support, as we need VT-d to support guest physical address to machine 
address translation for DMA.

However, theoretically, you can do it by hacking Xen to setup identical 
(1:1) mappings for guest's memory, but it's not a pretty way and you 
should expect to suffer lots of tricky corner case bugs.

Thanks,
-Kai

On 03/07/2014 11:03 AM, Dushyant Behl wrote:
> Hi all,
>
> I am new to the xen community and I wanted to work on the project
> "Allowing guests to boot with a passed-through GPU as the primary
> display" but the processor in my system does not supports IO MMU
> Virtualization (Intel VT-d), it only supports the Intel Virtualization
> (Intel VT-x). Would it be possible for me to work on the project in anyway?
>
> Thanks,
> Dushyant
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
>

Re: GPU Passthrough without VT-d

[Dushyant Behl]

[-- Attachment #1.1: Type: text/plain, Size: 1153 bytes --]

Thanks for the quick reply. I'll try to look into it.

-
Dushyant


On Fri, Mar 7, 2014 at 12:51 PM, Kai Huang <kai.k.huang@linux.intel.com>wrote:

> In general you cannot do pci passthrough for HVM without IOMMU (vt-d)
> support, as we need VT-d to support guest physical address to machine
> address translation for DMA.
>
> However, theoretically, you can do it by hacking Xen to setup identical
> (1:1) mappings for guest's memory, but it's not a pretty way and you should
> expect to suffer lots of tricky corner case bugs.
>
> Thanks,
> -Kai
>
>
> On 03/07/2014 11:03 AM, Dushyant Behl wrote:
>
>> Hi all,
>>
>> I am new to the xen community and I wanted to work on the project
>> "Allowing guests to boot with a passed-through GPU as the primary
>> display" but the processor in my system does not supports IO MMU
>> Virtualization (Intel VT-d), it only supports the Intel Virtualization
>> (Intel VT-x). Would it be possible for me to work on the project in
>> anyway?
>>
>> Thanks,
>> Dushyant
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel
>>
>>

[-- Attachment #1.2: Type: text/html, Size: 1885 bytes --]

[-- Attachment #2: Type: text/plain, Size: 126 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: GPU Passthrough without VT-d

[Pasi Kärkkäinen]

On Fri, Mar 07, 2014 at 11:06:34PM +0530, Dushyant Behl wrote:
>    Thanks for the quick reply. I'll try to look into it.
>

There's an old patch to do that in the Xen wiki.. 

-- Pasi

>    -
>    Dushyant
> 
>    On Fri, Mar 7, 2014 at 12:51 PM, Kai Huang
>    <[1]kai.k.huang@linux.intel.com> wrote:
> 
>      In general you cannot do pci passthrough for HVM without IOMMU (vt-d)
>      support, as we need VT-d to support guest physical address to machine
>      address translation for DMA.
> 
>      However, theoretically, you can do it by hacking Xen to setup identical
>      (1:1) mappings for guest's memory, but it's not a pretty way and you
>      should expect to suffer lots of tricky corner case bugs.
> 
>      Thanks,
>      -Kai
> 
>      On 03/07/2014 11:03 AM, Dushyant Behl wrote:
> 
>        Hi all,
> 
>        I am new to the xen community and I wanted to work on the project
>        "Allowing guests to boot with a passed-through GPU as the primary
>        display" but the processor in my system does not supports IO MMU
>        Virtualization (Intel VT-d), it only supports the Intel Virtualization
>        (Intel VT-x). Would it be possible for me to work on the project in
>        anyway?
> 
>        Thanks,
>        Dushyant
> 
>        _______________________________________________
>        Xen-devel mailing list
>        [2]Xen-devel@lists.xen.org
>        [3]http://lists.xen.org/xen-devel
> 
> References
> 
>    Visible links
>    1. mailto:kai.k.huang@linux.intel.com
>    2. mailto:Xen-devel@lists.xen.org
>    3. http://lists.xen.org/xen-devel

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: GPU Passthrough without VT-d

[Pasi Kärkkäinen]

On Fri, Mar 07, 2014 at 09:22:32PM +0200, Pasi Kärkkäinen wrote:
> On Fri, Mar 07, 2014 at 11:06:34PM +0530, Dushyant Behl wrote:
> >    Thanks for the quick reply. I'll try to look into it.
> >
> 
> There's an old patch to do that in the Xen wiki.. 
> 

See here:
http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-09/msg00018.html

-- Pasi

> 
> >    -
> >    Dushyant
> > 
> >    On Fri, Mar 7, 2014 at 12:51 PM, Kai Huang
> >    <[1]kai.k.huang@linux.intel.com> wrote:
> > 
> >      In general you cannot do pci passthrough for HVM without IOMMU (vt-d)
> >      support, as we need VT-d to support guest physical address to machine
> >      address translation for DMA.
> > 
> >      However, theoretically, you can do it by hacking Xen to setup identical
> >      (1:1) mappings for guest's memory, but it's not a pretty way and you
> >      should expect to suffer lots of tricky corner case bugs.
> > 
> >      Thanks,
> >      -Kai
> > 
> >      On 03/07/2014 11:03 AM, Dushyant Behl wrote:
> > 
> >        Hi all,
> > 
> >        I am new to the xen community and I wanted to work on the project
> >        "Allowing guests to boot with a passed-through GPU as the primary
> >        display" but the processor in my system does not supports IO MMU
> >        Virtualization (Intel VT-d), it only supports the Intel Virtualization
> >        (Intel VT-x). Would it be possible for me to work on the project in
> >        anyway?
> > 
> >        Thanks,
> >        Dushyant
> > 
> >        _______________________________________________
> >        Xen-devel mailing list
> >        [2]Xen-devel@lists.xen.org
> >        [3]http://lists.xen.org/xen-devel
> > 
> > References
> > 
> >    Visible links
> >    1. mailto:kai.k.huang@linux.intel.com
> >    2. mailto:Xen-devel@lists.xen.org
> >    3. http://lists.xen.org/xen-devel
> 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xen.org
> > http://lists.xen.org/xen-devel
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: GPU Passthrough without VT-d

[Dushyant Behl]

[-- Attachment #1.1: Type: text/plain, Size: 2758 bytes --]

Sorry I was outside so couldn't reply. I found the patch earlier but as
this would be my first project so i was a little conscious about the corner
case bugs.
I was also planning to buy some new hardware so i though i could give it a
go then, Nevertheless i'll try to use the patch in the meantime.

Thanks,
Dushyant





On Sat, Mar 8, 2014 at 10:31 AM, Pasi Kärkkäinen <pasik@iki.fi> wrote:

> On Fri, Mar 07, 2014 at 09:22:32PM +0200, Pasi Kärkkäinen wrote:
> > On Fri, Mar 07, 2014 at 11:06:34PM +0530, Dushyant Behl wrote:
> > >    Thanks for the quick reply. I'll try to look into it.
> > >
> >
> > There's an old patch to do that in the Xen wiki..
> >
>
> See here:
>
> http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-09/msg00018.html
>
> -- Pasi
>
> >
> > >    -
> > >    Dushyant
> > >
> > >    On Fri, Mar 7, 2014 at 12:51 PM, Kai Huang
> > >    <[1]kai.k.huang@linux.intel.com> wrote:
> > >
> > >      In general you cannot do pci passthrough for HVM without IOMMU
> (vt-d)
> > >      support, as we need VT-d to support guest physical address to
> machine
> > >      address translation for DMA.
> > >
> > >      However, theoretically, you can do it by hacking Xen to setup
> identical
> > >      (1:1) mappings for guest's memory, but it's not a pretty way and
> you
> > >      should expect to suffer lots of tricky corner case bugs.
> > >
> > >      Thanks,
> > >      -Kai
> > >
> > >      On 03/07/2014 11:03 AM, Dushyant Behl wrote:
> > >
> > >        Hi all,
> > >
> > >        I am new to the xen community and I wanted to work on the
> project
> > >        "Allowing guests to boot with a passed-through GPU as the
> primary
> > >        display" but the processor in my system does not supports IO MMU
> > >        Virtualization (Intel VT-d), it only supports the Intel
> Virtualization
> > >        (Intel VT-x). Would it be possible for me to work on the
> project in
> > >        anyway?
> > >
> > >        Thanks,
> > >        Dushyant
> > >
> > >        _______________________________________________
> > >        Xen-devel mailing list
> > >        [2]Xen-devel@lists.xen.org
> > >        [3]http://lists.xen.org/xen-devel
> > >
> > > References
> > >
> > >    Visible links
> > >    1. mailto:kai.k.huang@linux.intel.com
> > >    2. mailto:Xen-devel@lists.xen.org
> > >    3. http://lists.xen.org/xen-devel
> >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@lists.xen.org
> > > http://lists.xen.org/xen-devel
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xen.org
> > http://lists.xen.org/xen-devel
>

[-- Attachment #1.2: Type: text/html, Size: 4319 bytes --]

[-- Attachment #2: Type: text/plain, Size: 126 bytes --]

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel