Hi Jan,
On 09/15/2017 01:15 PM, Jan Beulich wrote:
On 14.09.17 at 18:49, <julien.gr...@arm.com> wrote:
get_page_from_gfn will be able to get reference on foreign page and as
per my understanding will allow to grant page on foreign memory.
This was not allowed with a simple get_page(...) on the ARM
implementation (no sharing nor paging supprot) but is allowed on the x86
implementation due to get_page_from_gfn.
On x86, foreign pages are currently only allowed for PVH dom0, so I
think it is not a big deal for now.
On Arm, foreign pages can be present on any domain. So this patch would
permit grant on foreing pages.
So I would like to check whether it would be valid to grant a mapping on
foreign pages?
No, I don't think grants should be permitted for other domains'
pages.
Which seems to match the PV behavior. I will update the patch to forbid
foreign pages and use #ifdef.
Cheers,
--
Julien Grall
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