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Re: [Xen-devel] [PATCH 2/4] xen: introduce grant_map_exists


At 11:02 +0100 on 02 Oct (1412244156), Stefano Stabellini wrote:
> Check whether an mfn has been granted to a given domain on a target
> grant table.

The implementation looks good but I'm concerned about the need for it,
since linear scans of busy grant tables could get fairly expensive.

I see in patch 3/4 you add a hypercall to flush caches, taking an mfn
range.  Should that not take a gfn range?  That would be the idiomatic
interface, and the p2m lookup would tell you whether the guest had
appropiate rights.

I suspect, from reading 0/4, that I'm missing something about the
tangle of non-IOMMU dom0 operations on ARM. :)



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