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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-11-13 at 13:42 +0000, Julien Grall wrote:
> 
> 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.

Are you sure that the second one isn't only avaiable to compat (AKA
32-bit) processes?

Ian



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