Messages in this thread | | | Date | Fri, 21 Aug 2020 10:16:33 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/entry/64: Disallow RDPID in paranoid entry if KVM is enabled |
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On Fri, Aug 21, 2020 at 10:09:01AM +0200, Paolo Bonzini wrote: > One more MSR *is* a big deal: KVM's vmentry+vmexit cost is around 1000 > cycles, adding 100 clock cycles for 2 WRMSRs is a 10% increase.
The kernel uses TSC_AUX so we can't reserve it to KVM either.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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