Re: [Xen-devel] [PATCH v4 13/17] libxc: arm: allow passing a device tree blob to the guest

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 11/13/2013 12:16 PM, Ian Campbell wrote:
> On Wed, 2013-11-13 at 12:01 +0000, Stefano Stabellini wrote:
>
> > > and in any case this
> > > is user space (and common code) so I don't know how we can do so.
> > Linux offers an __ARM_NR_cacheflush syscall, it is implemented as a
> > dcache flush on v7.
> >
> >
> > > IIRC Julien was working on a generic solution for this issue.
> > What is the generic solution?
> Not sure, could be __ARM_NR_cacheflush or maybe when adding foreign
> mappings to a p2m we should make them uncached depending on the target
> VCPUs state (in particular when the domain is under construction, I'm
> less concerned with domains which turn off caching at runtime). Or maybe
> he had some other idea.
I plan to implement the solution with __ARM_NR_cacheflush. It's the best 
approach for now. It's also implemented on v8 with 
__ARM_NR_compat_cacheflush.
--
Julien Grall

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