Messages in this thread | | | Date | Fri, 5 Jan 2018 17:56:01 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v1 0/3] x86/cpu/AMD: Make LFENCE a serializing instruction on AMD |
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On Fri, Jan 05, 2018 at 10:07:36AM -0600, Tom Lendacky wrote: > To aid in speculation control, the LFENCE instruction will be turned into > a serializing instruction. There is less performance impact using LFENCE > in this way compared to MFENCE. > > With LFENCE now being a serializing instruction, it can be used in > rdtsc_ordered() in place of MFENCE_RDTSC. The other two patches in this > series make this change and remove the MFENCE_RDTSC feature. > > The following patches are included in this series: > - Make LFENCE a serializing instruction on AMD > - Change over to LFENCE_RDTSC from MFENCE_RDTSC on AMD > - Remove the MFENCE_RDTSC feature > > This patch series is based on tip:x86/pti. > > --- > > Tom Lendacky (3): > x86/cpu/AMD: Make LFENCE a serializing instruction > x86/cpu/AMD: Use LFENCE_RDTSC instead of MFENCE_RDTSC > x86/msr: Remove now unused definition of MFENCE_RDTSC feature
All three:
Reviewed-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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