Re: Xen patches merged to upstream Linux 2.6.36, plans for 2.6.37? - Mr. Teo En Ming (Zhang Enming) of Singapore

From: "Mr. Teo En Ming (Zhang Enming) of Singapore" <space.time.universe@gmail.com>
To: "Pasi Kärkkäinen" <pasik@iki.fi>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	zhang_enming@lavabit.com,
	"teoenming@hotmail.com" <teoenming@hotmail.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	"Han, Weidong" <weidong.han@intel.com>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	"space.time.universe@gmail.com" <space.time.universe@gmail.com>
Subject: Re: Xen patches merged to upstream Linux 2.6.36, plans for 2.6.37?
Date: Tue, 17 Aug 2010 01:23:27 +0800	[thread overview]
Message-ID: <4C69740F.8060405@gmail.com> (raw)
In-Reply-To: <20100816165548.GQ2804@reaktio.net>

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I have serious doubts that those one-year-old patches from Han Weidong 
of Intel Corp could be applied to Xen 4.0.1-rc6. They could be extremely 
incompatible since source codes written now would be vastly different to 
those written one year ago, especially for the Xen hypervisor. Those 
patches were designed or written in mind for xen-unstable version 3.5. 
Just one year back then.

Are there no ***CURRENT*** patches for Xen 4.0.1-rc6 to enable secondary 
graphics adapter VGA passthrough from Intel Corporation?

Let's ask Han Weidong for his opinion on this matter.

At the moment, I think I am just going to try VGA passthrough of the 
Intel IGD only.

Thank you very much.

Yours sincerely,

Mr. Teo En Ming (Zhang Enming)
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On 08/17/2010 12:55 AM, Pasi Kärkkäinen wrote:
> On Tue, Aug 17, 2010 at 12:44:44AM +0800, Mr. Teo En Ming (Zhang Enming) of Singapore wrote:
>    
>>     Dear Pasi,
>>
>>     I have just finished downloading the latest Xen 4.0.1-rc6 hypervisor and
>>     also the latest paravirt-ops dom0 Linux kernel 2.6.32.19, at the time of
>>     this writing.
>>
>>     I understand that, by default, Xen 4.0.x hypervisor series support VGA
>>     passthrough of the primary graphics adapter, especially Intel Integrated
>>     Graphics Device (IGD) if you are using an Intel Desktop Board like me
>>     (Intel DQ45CB). Hence no additional work/patches are required if you just
>>     want to passthrough the IGD or primary VGA adapter. But VGA passthrough of
>>     the secondary graphics adapter, ie. my NVIDIA GeForce 8400 GS PCI Express
>>     x16 display adapter, is not supported by default. To passthrough the
>>     secondary graphics adapter to your Windows XP, Windows Vista or Windows 7
>>     HVM fully virtualized virtual machine, patches are required to load the
>>     VGA BIOS of the secondary graphics adapter from a file named
>>     vgabios-pt.bin and also to perform 1:1 vBAR:pBAR mappings.
>>
>>     I have just finished reading through the following Xen wiki pages:
>>
>>     [1]http://wiki.xensource.com/xenwiki/XenParavirtOps
>>
>>     [2]http://wiki.xensource.com/xenwiki/XenVGAPassthrough
>>
>>     [3]http://lists.xensource.com/archives/html/xen-devel/2009-08/msg01176.html
>>
>>     [4]http://lists.xensource.com/archives/html/xen-devel/2010-05/msg00441.html
>>
>>     I am wondering if I can apply the four patches attached in this xen-devel
>>     mailing list topic
>>     [5]http://lists.xensource.com/archives/html/xen-devel/2009-08/msg01176.html
>>     to Xen 4.0.1-rc6?
>>
>>     I have already used those same set of patches from Han Weidong of Intel
>>     Corporation between July and November last year (2009) to patch
>>     xen-unstable 3.5 for my NVIDIA GeForce 8400 GS PCI Express x16 VGA
>>     adapter. The thing that is troubling me is whether I can used the same set
>>     of patches to patch Xen 4.0.1-rc6, since the patches are already outdated.
>>     The patches which had been provided by Han Weidong to me were dated 31st
>>     August 2009, almost one year ago.
>>
>>     I am asking if the patches provided here at
>>     [6]http://lists.xensource.com/archives/html/xen-devel/2009-08/msg01176.html
>>     are ***COMPATIBLE*** with Xen 4.0.1-rc6 at all? Would the patches cause
>>     errors to be displayed/generated when applied to Xen 4.0.1-rc6?
>>
>>     I am looking forward to your reply.
>>
>>      
> I haven't tried those patches.. so you just have to try and see how it goes!
>
> -- Pasi
>
>
>    

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