Re: [Xen-devel] [PATCH v2 RFC 2/4] x86/PV: support data breakpoint extension registers

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-03-27 at 16:44 +0000, Jan Beulich wrote:
> >>> On 27.03.14 at 17:23, <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Thu, 2014-03-27 at 16:03 +0000, Jan Beulich wrote:
> >> >>> On 27.03.14 at 16:28, <Ian.Campbell@xxxxxxxxxx> wrote:
> >> > Do the protocol docs in xg_save_restore need updating due to this
> >> > change?
> >> 
> >> Not sure about that - this doesn't seem to talk about what's inside
> >> the "bodies".
> > 
> > Is this extending the "VCPU context data"? or one of the XC_SAVE_ID_*
> > things? I think it would be worth extending that to indicate the new
> > "optional" data, where and what it is etc.
> 
> Yeah, I could probably add a note to the "extv" thing, even if it
> doesn't really fit.

Sounds good, thanks.

> >> > How does N->N+1 migration work out?
> >> 
> >> Since the structure size grows, and that size is embedded in the
> >> structure, input coming from N will be treated as not having any
> >> MSRs.
> > 
> > This is the size of the "extv" block in the header phase?
> 
> No, the "size" member of struct xen_domctl_ext_vcpucontext.

OK, that makes sense.

Are you also breaking the 128b limit on the data returned by this
struct?

Ian.


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