On Mon, Jun 07, 2021 at 11:20:58AM +0100, Mark Rutland wrote: > On Fri, Jun 04, 2021 at 04:59:30PM -0700, Suraj Jitindar Singh wrote: > > It's my understanding that the two pieces of work required to enable live > > patching on arm are in flight upstream; > > - Reliable stack traces as implemented by Madhavan T. Venkataraman [1] > > - Objtool as implemented by Julien Thierry [2] > > We also need to rework the arm64 patching code to not rely on any code > which may itself be patched. Currently there's a reasonable amount of > patching code that can either be patched directly, or can be > instrumented by code that can be patched. > > I have some WIP patches for that at: > > https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arm64/patching/rework > > ... but there's still a lot to do, and it's not clear to me if there's > other stuff we need to rework to make patch-safe. > > Do we have any infrastructure for testing LIVEPATCH? > Hi Mark, If you're looking for a high level sanity check, there are livepatching integration selftests in tools/testing/selftests/livepatch. Let me know if you have any questions about those. Regards, -- Joe
