Re: [Xen-devel] [PATCH v2 1/3] Add vmware_hw to xl.cfg

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 09/08/2014 10:21 AM, Jan Beulich wrote:
> > > > On 08.09.14 at 15:56, <dslutz@xxxxxxxxxxx> wrote:
> > On 09/08/14 09:20, Ian Campbell wrote:
> > > On Wed, 2014-09-03 at 08:45 +0100, Jan Beulich wrote:
> > > > > > > On 02.09.14 at 20:24, <dslutz@xxxxxxxxxxx> wrote:
> > > > > On 09/02/14 03:28, Jan Beulich wrote:
> > > > > > > > > On 01.09.14 at 17:33, <dslutz@xxxxxxxxxxx> wrote:
> > > > > > > So based on this, I picked the order:
> > > > > > >
> > > > > > > 0x40000000 is viridian, vmware or xen
> > > > > > > 0x40000100 is vmware or xen
> > > > > > > 0x40000200 is xen
> > > > > > Is there really a point in enabling both Viridian and VMware extensions
> > > > > > at the same time?
> > > > > Not that I know of (and I do not want to say there there is no code
> > > > > out there that can work with both).  Instead of an error or warning
> > > > > I went with what xen is currently doing and that seabios was happy
> > > > > to find xen at 0x40000200.
> > > > >
> > > > > If the consensus is to ignore, or report an error or warning I will go that
> > > > > way.  For now I am not planning on changing.
> > > > My personal take on this is that the hypervisor (or perhaps already
> > > > the tools) should reject enabling both at the same time.
> > > That sounds sensible to me.
> > >
> > > Generally we seem to have the hypervisor check these things as a
> > > backstop, to stop broken tools, but also check in the tools so we can
> > > give a better error message.
> > Ok, with 2 votes this way how about (for v4) I will drop the change to
> > xen/arch/x86/traps.c (I.E. 0x40000100 will be xen)  And change
> >
> > cpuid_vmware_leaves to return 0 if is_viridian_domain().
> Not exactly - the conclusion rather is to not allow both to become
> true at the same time.
I have vague recollection of some Windows products (newer Microsoft 
Server releases?) expecting to run on hypervisor, i.e. Viridian. Would 
such restriction break these?
Or is this orthogonal to this discussion (assuming I am right about MS 
in the first place)?
-boris

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