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Re: [Xen-devel] treatment grant frames during save/restore
| To: | Jan Beulich <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] treatment grant frames during save/restore |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 28 May 2010 09:22:06 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 28 May 2010 01:23:15 -0700 |
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| Thread-topic: | [Xen-devel] treatment grant frames during save/restore |
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On 28/05/2010 09:01, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
> Wouldn't is suffice to adjust XEN_DOMCTL_getpageframeinfo{2,3} to
> report these pages as special (not sure whether a new type would
> be needed, or whether simply returning XEN_DOMCTL_PFINFO_XTAB
> would be acceptable), thus allowing the tools to skip them as
> necessary? This of course implies that the tools would need to issue
> the call for HVM guests (currently I think they do so only for PV ones),
> that the actual page contents is irrelevant post-restore, and that
> there being a hole in the physical address space post-restore isn't
> a problem for the pv drivers.
Yep that would probably work. And also potentially gets rid of one lot of
"if-hvm-else-pv" branched code in xc_domain_save.c. I'd take a patch to do
that if you want to pick this item up.
-- Keir
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