Messages in this thread | | | From | Andrew Cooper <> | Subject | Re: [PATCH 00/29] x86: Kernel IBT | Date | Sat, 19 Feb 2022 16:00:59 +0000 |
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On 19/02/2022 09:58, Peter Zijlstra wrote: > On Sat, Feb 19, 2022 at 01:29:45AM +0000, Edgecombe, Rick P wrote: >> On Fri, 2022-02-18 at 17:49 +0100, Peter Zijlstra wrote: >>> This is an (almost!) complete Kernel IBT implementation. It's been >>> self-hosting >>> for a few days now. That is, it runs on IBT enabled hardware >>> (Tigerlake) and is >>> capable of building the next kernel. >>> >>> It is also almost clean on allmodconfig using GCC-11.2. >>> >>> The biggest TODO item at this point is Clang, I've not yet looked at >>> that. >> Do you need to turn this off before kexec? > Probably... :-) I've never looked at that code though; so I'm not > exactly sure where to put things. > > I'm assuming kexec does a hot-unplug of all but the boot-cpu which then > leaves only a single CPU with state in machine_kexec() ? Does the below > look reasonable?
If you skip writing to S_CET on hardware that doesn't have it, probably.
~Andrew
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