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: 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.
Thanks a lot for your clarification!

Thanks,
Feng

> 
> Jan
> 


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