Re: [Xen-devel] Bisected Xen-unstable: "Segment register inaccessible for d1v0" when starting HVM guest on intel

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Tuesday, July 08, 2014 4:49 AM
> To: Wu, Feng
> Cc: Jan Beulich; Andrew Cooper; xen-devel@xxxxxxxxxxxxxxxxxxxx; Sander
> Eikelenboom
> Subject: Re: [Xen-devel] Bisected Xen-unstable: "Segment register inaccessible
> for d1v0" when starting HVM guest on intel
> 
> On Fri, Jul 04, 2014 at 09:08:28AM +0000, Wu, Feng wrote:
> >
> >
> > > -----Original Message-----
> > > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> > > Sent: Friday, July 04, 2014 5:04 PM
> > > To: Wu, Feng
> > > Cc: Andrew Cooper; Sander Eikelenboom; xen-devel@xxxxxxxxxxxxxxxxxxxx
> > > Subject: RE: Bisected Xen-unstable: "Segment register inaccessible for
> d1v0"
> > > when starting HVM guest on intel
> > >
> > > >>> On 04.07.14 at 10:54, <feng.wu@xxxxxxxxx> wrote:
> > > > BTW, there is another question. I grep
> > > > 'VCPUOP_register_vcpu_time_memory_area'
> > > > in the latest branch of Linux kernel code, but I find nothing about it. 
> > > > Do
> > > > you know how
> > > > it is used by guests? Or this hypercall is being provided by Xen, but 
> > > > Linux
> > > > hasn't used it yet?
> > >
> > > Iirc there had been a use of it a long time ago (around Xen 4.0) in
> > > experimental patches (or maybe in Jeremy's tree), but the Xen side
> > > implementation was buggy and didn't get fixed until 4.3. And the
> > > user mode pv-clock implementation for pv-ops Xen is still undone.
> >
> > I got it, oh, I also find some informal patches about this on the Internet 
> > just
> now.
> 
> I hope to have them implemented in two weeks time. Will CC you on them
> so you can test it out.

Thanks for that!

> 
> > Thanks a lot for your clarification!
> >
> > Thanks,
> > Feng
> >
> > >
> > > Jan
> > >
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel

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