Re: [Xen-users] What does viridian=1 do?

[Florian Manschwetus <florianmanschwetus@xxxxxx>]

Am 31.08.2009 17:10, schrieb Matthieu Patou:
> On 08/21/2009 02:15 PM, James Harper wrote:
> > > Am 21.08.2009 04:23, schrieb James Harper:
> > > > > > > So for faster IO you need GPLPV drivers.
> > > > > > I still would vote for further investigation and development on
> > viridian
> > > > > > enlighten IO. It would bring us out of the hell with driver signing,
> > and
> > > > > > would also make a lot of stuff easier from the users stand.
> > > > > > The work of James Harper is pretty good but for 2008 x64 more than
> > just
> > > > > > far away from ready for production.
> > > > > Yes, definitely that would be good.
> > > > >
> > > > > Feel free to start working on it :) I believe the needed viridian
> > > interfaces
> > > > > can be seen at least from linux hyper-v driver (linux-ic). Also
> > > > > iirc ms
> > > > > released some docs about the interfaces.
> > > > You are talking about reverse engineering a backend driver to match the
> > > frontend driver in Linux. That would certainly be an interesting
> > > project,
> > but
> > > I wonder how Microsoft would feel about it :)
> > > > James
> > > Uhm, James you have the best knowledge about this topic (the other way
> > > around), would you say this is a real gap?
> > I'm not at all familiar with HyperV aside from a little bit of knowledge
> > about what viridian=1 does, and only then because viridian=1 crashed
> > gplpv
> > due to a bug in the way I had implemented my cpuid calls.
> >
> > The point I was making is that Microsoft have provided the open source
> > drivers to better allow other operating systems to integrate with their
> > product. If you reverse engineer that to make their operating systems
> > work
> > better with xen then they might get a little bit upset... or they might
> > not... I'm not a Microsoft lawyer :)
> Guessing how the otherside should behave is not for the faint of heart I
> suppose. Ask the guys from samba on how they struggle to make samba a
> Domain controller ...
> Concerning upsetting Microsoft I don't see the problem that's what Samba
> team is doing and there is a lot of project in the wild doing the same
> with MS products and other products. Problem starts if you use patented
> software methods (and well at least in US mainly for the moment as for
> UE software patents are not valid).
>
> I have 0 knowledge of HyperV technology but maybe the drivers for a
> guest Windows into a Windows host are not by default installed in the
> guest but proposed by the host to the guest in a similar way of how it
> works with virtualbox or vmware (but it seems that starting from w2k8
> this drivers are already installed ... is it true ? is it true also for
> Windows 7 ?).
>
> I found some documentation about the functional spec of HyperV
> http://www.microsoft.com/downloads/details.aspx?FamilyID=91e2e518-c62c-4ff2-8e50-3a37ea4100f5&DisplayLang=en
Also some basic support is included into WinXP and 2003 R2 with latest 
servicepacks.
Florian
> > There may well be some technical limitations that prevent a HyperV
> > compatible backend layer being added to Xen... I don't know enough about
> > either to say.
> >
> > If it could be done, then a whole lot of things would 'just work', and as
> > you say it could solve a lot of driver issues.
> >
> > > Or is the GPLPV-driver on the
> > > way to fill it anyway soon, especially are there plans to get the
> > > drivers signed? As I see it there wouldn't be any other proper solutions
> > > for this topic.
> > I'm trying to fix a few bugs in the shutdown/suspend/resume/etc paths
> > at the
> > moment and it's proving a long and frustrating exercise, and I haven't
> > had a
> > lot of time to work on it lately.
> Matthieu.
>
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