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xen-devel
Re: [Xen-devel] [Patch] [libxc] add missing free in xc_finish_mmu_update
On Sun, 08 Apr 2007 15:05:37 +0100
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> On 8/4/07 13:14, "Stephan Creutz" <stephan.creutz@xxxxxxxxxxxxxxxxx>
> wrote:
> > I'm trying to develop a fast rollback for domains without recreating
> > the whole domain. In some cases I need to update pagetables to
> > restore an older memory state from a checkpoint. Maybe I should
> > integrate it in libxc itself to avoid code duplication. But I
> > thought it would be better to start with an external tool because my
> > rollback is very special. It uses the shadow pagetables all the time
> > to track dirty pages. Shadow pagetables are slow, so it might not be
> > useful for other users.
>
> I'm not sure whether this will work. It's not possible to modify
> another domain's page tables if Xen is currently type-tracking the
> page tables as such. You'd have to modify Xen to be able to do that.
Ok, thought a little bit about that. If I modify Xen in way that foreign
pagetable updates from Dom0 are possible, would this change will ever
have a chance to be accepted for Xen or is it against the general design
principles of Xen? Or in other words: is it not implemented because no
one needs that feature for now or because it is not wanted for any
reason? All I try to prevent are external patches, which I have to adapt
every time the Xen internals are changing.
Stephan
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