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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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 a lot for your clarification!
> 
> Thanks,
> Feng
> 
> > 
> > Jan
> > 
> 
> 
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