On 09.07.24 16:48, Fuad Tabba wrote:
Hi Patrick,
On Tue, Jul 9, 2024 at 2:21 PM Patrick Roy <roypat@xxxxxxxxxxxx> wrote:
Allow mapping guest_memfd into userspace. Since AS_INACCESSIBLE is set
on the underlying address_space struct, no GUP of guest_memfd will be
possible.
This patch allows mapping guest_memfd() unconditionally. Even if it's
not guppable, there are other reasons why you wouldn't want to allow
this. Maybe a config flag to gate it? e.g.,
As discussed with Jason, maybe not the direction we want to take with
guest_memfd.
If it's private memory, it shall not be mapped. Also not via magic
config options.
We'll likely discuss some of that in the meeting MM tomorrow I guess
(having both shared and private memory in guest_memfd).
Note that just from staring at this commit, I don't understand the
motivation *why* we would want to do that.
--
Cheers,
David / dhildenb
