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Unless I'm misreading the splat+code, the > > > issue isn't that init_ia32_feat_ctl() clears VMX late, it's that the BSP sees > > > VMX as fully enabled, but at least one AP sees VMX as disabled. > > > > > > I don't see how the kernel can expect to function correctly with divergent feature > > > support across CPUs, i.e. the WARN is a _good_ thing in this case, because it > > > alerts the user that their system is messed up, e.g. has a bad BIOS or something. > > > > Yes, and yes. > > > > There are two issues. Clearing feature flags after alternatives have > > been applied should not happen, and this particular issue with that box. > > > > Lemme cook up something in the coming days for the former. > > Two simple patches as a reply to this. > > Oliver, can you run them on your box pls? we confirmed after applying them upon ee8962082a, the WARNING which was reported in our original report cannot be reproduced any longer. Tested-by: kernel test robot > > Thx. > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette