Messages in this thread | | | Date | Mon, 18 Oct 2021 20:05:10 +0000 | From | Sean Christopherson <> | Subject | Re: [PATCH v2] x86/cpu: Fix migration safety with X86_BUG_NULL_SEL |
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On Mon, Oct 18, 2021, Borislav Petkov wrote: > On Mon, Oct 18, 2021 at 07:29:41PM +0000, Sean Christopherson wrote: > > I agree. If the argument for this patch is that the kernel can be migrated to > > older hardware, then it stands to reason that the kernel could also be migrated > > to a different CPU vendor entirely. E.g. start on Intel, migrate to Zen1, kaboom. > > Migration across vendors? Really, that works? > > I'll believe it only when I see it with my own eyes.
There are plenty of caveats, but it is feasible. KVM even has a few patches that came about specifically to support cross-vendor migration, e.g. commit adc2a23734ac ("KVM: nSVM: improve SYSENTER emulation on AMD").
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