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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 29 Jan 2014, Jan Beulich wrote:
> > +static void do_one_cacheflush(paddr_t mfn)
> > +{
> > +    void *v = map_domain_page(mfn);
> > +
> > +    flush_xen_dcache_va_range(v, PAGE_SIZE);
> > +
> > +    unmap_domain_page(v);
> > +}
> 
> Sort of odd that you have to map a page in order to flush cache
> (which I very much hope is physically indexed, or else this
> operation wouldn't have the intended effect anyway). Can this
> not be done based on the machine address?

Unfortunately no. I asked for a similar change when Ian sent the RFC
because I was concerned about performances, but it turns out is not
possible. A pity.

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