Re: [Xen-devel] [RFC PATCH 11/24] ARM: vGICv3: handle virtual LPI pending and property tables

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 2 Nov 2016, Julien Grall wrote:
> > +    }
> > +
> > +    ptr = vmap(pages, nr_pages);
> 
> I am not a big fan of the vmap solution for various reasons:
>       - the VMAP area is small (only 1GB) it will not scale (you seem
> to use it to map pretty much all memory provisioned for the ITS)
>       - writing in a register cannot fail, how do you co-op with that?
> 
> I think the best approach here is to use a similar approach as
> copy_*_guests helpers but dealing with IPA rather than guest VA.

I don't like the idea of using the vmap for this either, but the problem
with the copy_*_guest approach is that it only maps one page at a time.
It is unable to map multiple pages contiguously, which seems to be
required here.

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