Re: [Xen-devel] [PATCH v2 3/4] xen/arm: clean and invalidate all guest caches by VMID after domain build.

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("Re: [PATCH v2 3/4] xen/arm: clean and invalidate all 
guest caches by VMID after domain build."):
> On Tue, 2014-02-04 at 15:32 +0000, Ian Jackson wrote:
> > The approach you are taking here is that for pages explicitly mapped
> > by some libxc caller, you do the flush on unmap.  But what about
> > callers who don't unmap ?  Are there callers which don't unmap and
> > which instead are relying on memory coherency assumptions which aren't
> > true on arm ?
> 
> Callers which don't unmap would be leaking mappings and therefore buggy
> in a long running toolstack.

What I mean is that they might map the guest pages, and expect to
exchange data with the guest through the pages while they were still
mapped ...

> Also after the initial start of day period we require that the guest
> enable its caches.

... but before the guest enables caching.

Ian.

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