Re: [Xen-devel] [PATCH v3 00/12] Alternate p2m: support multiple copies of host p2m

[Tim Deegan <tim@xxxxxxx>]

At 10:50 +0100 on 06 Jul (1436179849), Jan Beulich wrote:
> >>> On 01.07.15 at 20:09, <edmund.h.white@xxxxxxxxx> wrote:
> > Changes since v2:
> > 
> > Addressed all v2 feedback *except*:
> > 
> >     In patch 5, the per-domain EPTP list page is still allocated from the
> >     Xen heap. If allocated from the domain heap Xen panics - IIRC on Haswell
> >     hardware when walking the EPTP list during exit processing in patch 6.
> 
> With this little detail I can't take this as a valid reason not to make
> this change. Also - weren't we aiming at getting the page from the
> HAP pool of the domain anyway?

This one keeps coming up again, and I think has not been explained
very clearly.  For me, the important detail is that this is basically
an extension of the VMCx structures, and not part of any per-vcpu/per-p2m
state:

http://lists.xenproject.org/archives/html/xen-devel/2015-03/msg03272.html

ISTR map_domain_page_global() slots being about as rare as xenheap
pages, but I guess both of those have changed a fair amount.

Tim.

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