18 Oct
2021
18 Oct
'21
8:05 p.m.
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").