Re: [Xen-devel] [PATCH v5 3/5] xen/arm: clean and invalidate all guest caches by VMID after domain build.

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-02-12 at 11:52 +0000, Jan Beulich wrote:
> >>> On 11.02.14 at 15:11, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> > Guests are initially started with caches disabled and so we need to make 
> > sure
> > they see consistent data in RAM (requiring a cache clean) but also that they
> > do not have old stale data suddenly appear in the caches when they enable
> > their caches (requiring the invalidate).
> > 
> > This can be split into two halves. First we must flush each page as it is
> > allocated to the guest. It is not sufficient to do the flush at scrub time
> > since this will miss pages which are ballooned out by the guest (where the
> > guest must scrub if it cares about not leaking the pagecontent). We need to
> > clean as well as invalidate to make sure that any scrubbing which has 
> > occured
> > gets committed to real RAM. To achieve this add a new cacheflush_page 
> > function,
> > which is a stub on x86.
> > 
> > Secondly we need to flush anything which the domain builder touches, which 
> > we
> > do via a new domctl.
> > 
> > Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> > Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
> > Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> 
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Thanks. With that I have applied this series.

Ian.



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