Hi
On 11/08/2016 21:05, Stefano Stabellini wrote:
On Thu, 11 Aug 2016, Julien Grall wrote:
On 09/08/2016 06:18, Konrad Rzeszutek Wilk wrote:
Hey!
Hi Konrad,
Over the last couple of months in my spare time I was playing
with making livepatch work with ARM64 (using the FoundationModel
simulator) and I finally got it working tonight.
Congrats!
Indeed, congratulations! I hope it was fun :-)
Sending out the patches just in case they don't work tomorrow :-)
The ARM32 part is going slowly - as I don't have a simulator
and using a real board takes time.
Whilst I can see usage of livepatch for Xen ARM64 (e.g server), I am less
convinced for ARM32. I am bit worry to check-in code that will get rotten in
the long term. So do you see any usage on ARM32?
Actually I think it is useful for embedded use cases too: think about
security updates for any embedded devices which cannot easily be
rebooted. Or even if they can be rebooted, it might create a
competitive advantage to build a car that can be updated for critical
security fixes without requesting the driver to stop.
I see your point, although I think updating Xen while driving sounds
really risky :). There are still a small window (few ms/ns) where
nothing can run. That might be an issue with real-time operating system.
This leads to few questions as I am not very familiar with livepatching.
Who decide when to patch? Is it the scheduler or the user requesting the
patching?
Also, could this be aborted because a task with higher priority is incoming?
Regards,
--
Julien Grall
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