Messages in this thread | | | Date | Wed, 17 Aug 2022 20:13:15 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/microcode/AMD: Attempt applying on every logical thread |
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On Wed, Aug 17, 2022 at 03:29:04PM +0000, Ashok Raj wrote: > What I meant was the patch removed any and all revid checks *completely* > Instead of even limiting to == checks.
I just tried downgrading the microcode on an AMD box. The hardware wouldn't accept the MSR write with the lower patch ID and the higher patch ID remained.
I'll find out whether this is universally the case on AMD.
> So forget the hardware testing part. This is a complex flow for > late-load and how can we get more people to test it today in the > community?
> Do we have a more scalable way to support it today?
You're not reading my mails. Lemme repeat: microcode loading is a dangerous business, especially the late thing. I'm certainly not going to expose that to people if there's no merit. The only merit for loading the same revision is for testing purposes.
If you're about to test stuff, you can just as well patch the microcode loader to do what you want it to, like I just did.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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