Messages in this thread | | | Date | Wed, 10 Jun 2020 14:32:26 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 3/3] x86/msr: Add an MSR write callback |
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On Wed, Jun 10, 2020 at 01:00:37PM +0200, Borislav Petkov wrote: > From: Borislav Petkov <bp@suse.de> > > Add a callback which gets executed after a MSR is written from > userspace. This is needed because in the case of AMD's MSR_AMD64_LS_CFG > MSR which gets cached in the kernel, the cached value needs to be > updated after the write, otherwise latter doesn't stick.
We cache a whole bunch of MSRs in kernel. Why is this one special?
If you write using the stupid msr device, you get to keep all pieces.
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