Re: [Xen-devel] [PATCH V14 2/7] xen/arm: Implement domain_get_maximum_gpfn

[Julien Grall <julien.grall.oss@xxxxxxxxx>]

Hi Tamas,

On 26/03/15 22:05, Tamas K Lengyel wrote:
> From: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> The function domain_get_maximum_gpfn is returning the maximum gpfn ever
> mapped in the guest. We can use d->arch.p2m.max_mapped_gfn for this purpose.
> 
> We use this in xenaccess as to avoid the user attempting to set page
> permissions on pages which don't exist for the domain, as a non-arch specific
> sanity check.

FWIW, xc_domain_maximum_gpfn is buggy for ARM64 as a PFN can be encode
with up to 36 bits which doesn't fit on the return code (an int is used).

Although, I don't see any call to xc_domain_maximum_gpfn in memaccess
(tools/tests/memaccess). So is this patch still useful?

Regards,

-- 
Julien Grall

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