On 22/06/2023 21:13, Benjamin Berg wrote:
Hi,
On Thu, 2023-06-22 at 21:41 +0200, Johannes Berg wrote:
On Thu, 2023-06-22 at 13:22 -0600, Rob Herring wrote:
I'm interested in getting UML working on Arm. Is anyone aware of any
efforts to do this already?
Not me ... But yeah, agree that it seems likely to require some
refactoring, even if _some_ degree of attempts were made to keep arch-
specific things there ...
There might be a ton of arch-specific things in the ptrace code too
At least a lot of the register handling, but that will always be
somewhat architecture specific.
In the arm case there may be some paging issues.
Arm pages are not necessarily 4096. I tried to implement non-4096 page support
for UML a couple of years ago and gave up.
It will be nice if we manage to fix this. End of the day - UML uses mmap(), so
it should be able to use page sizing which differs from the host one.
... , so perhaps it'd be easier to start with the seccomp-based model:
https://patchwork.ozlabs.org/project/linux-um/list/?series=329466
But that's not really done yet either.
Yes, though I have quite some updates locally that solve the security
issues (i.e. prevent host syscalls from userspace). So, it does need
rebasing and I am sure bugfixes, but I think it is getting into a
pretty good shape overall.
Either way, the old patchset will give you a good idea about how it all
works, the changes are mostly in the details. I am happy to push out a
new version sooner rather than later if it might help with any efforts
on your side.
Benjamin
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