Re: Xen 4.6 Development Update (three months reminder)

From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jim Fehlig <jfehlig@suse.com>, wei.liu2@citrix.com
Cc: elena.ufimtseva@oracle.com, feng.wu@intel.com,
	ian.jackson@eu.citrix.com, oleksandr.dmytryshyn@globallogic.com,
	chegger@amazon.de, cyliu@suse.com, fabio.fantoni@m2r.biz,
	edgar.iglesias@gmail.com, chao.p.peng@linux.intel.com,
	parth.dixit@linaro.org, dgolomb@seas.upenn.edu,
	manishjaggi.oss@gmail.com, kai.huang@linux.intel.com,
	jtweaver@hawaii.edu, vijay.kilari@gmail.com,
	rcojocaru@bitdefender.com, ross.lagerwall@citrix.com,
	tamas.lengyel@zentific.com, Vijaya.Kumar@caviumnetworks.com,
	anthony.perard@citrix.com, xen-devel@lists.xenproject.org,
	eshelton@pobox.com, olaf@aepfle.de, ian.campbell@citrix.com,
	wency@cn.fujitsu.com, julien.grall@linaro.org,
	frediano.ziglio@huawei.com, quan.xu@intel.com,
	tiejun.chen@intel.com, boris.ostrovsky@oracle.com,
	vkuznets@redhat.com, andrii.tseglytskyi@globallogic.com,
	jgross@suse.com, talex5@gmail.com, malcolm.crossley@citrix.com,
	ard.bie
Subject: Re: Xen 4.6 Development Update (three months reminder)
Date: Wed, 29 Apr 2015 01:21:39 +0100	[thread overview]
Message-ID: <55402413.8070409@citrix.com> (raw)
In-Reply-To: <554006ED.40300@suse.com>

On 28/04/15 23:17, Jim Fehlig wrote:
> Jim Fehlig wrote:
>> wei.liu2@citrix.com wrote:
>>    
>>> Hi all
>>>
>>> We are now three months into 4.6 development window. This is an email to keep
>>> track of all the patch series I gathered. It is by no means complete and / or
>>> acurate. Feel free to reply this email with new projects or correct my
>>> misunderstanding.
>>>    
>>>      
>> [...]
>>    
>>> *  libxl: add qxl vga interface support for upstream qemu (fair)
>>>    -  Fabio Fantoni
>>>    
>>>      
>> I've been working on SPICE support in the libvirt libxl driver and
>> quickly came across the lack of support for qxl device.  What is the
>> status of this work?  AFAICT, there was a v16 posted nearly a year ago
>> with no comments
>>
>> http://lists.xen.org/archives/html/xen-devel/2014-05/msg03214.html
>>    
> After playing with this more, I think the patch will need a
> LIBXL_HAVE_QXL or similar in libxl.h.
>
>> I noticed this work was committed in the 4.3 dev cycle, but was reverted
>> before the release by commit 5479961a, which describes problems with
>> "instructions that cannot be used for MMIO".  Has any progress been made
>> on that front?  Is Fabio's patch the only piece missing to support qxl
>> devices?
>>    
> I've tried Fabio's patch on top of fairly recent xen-unstable and don't
> see the issues mentioned in the commit message of 5479961a.  Note that I
> only tried linux HVM guests though.

16byte decomposed instruction still don't get passed correctly to the 
device model.

This has been discussed at the hackathon and plan is in place.

~Andrew