Messages in this thread | | | Subject | Re: [PATCH v1 1/3] x86/cpu/AMD: Make LFENCE a serializing instruction | From | Tom Lendacky <> | Date | Fri, 5 Jan 2018 10:36:40 -0600 |
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On 1/5/2018 10:35 AM, Brian Gerst wrote: > On Fri, Jan 5, 2018 at 11:07 AM, Tom Lendacky <thomas.lendacky@amd.com> wrote: >> To aid in speculation control, make LFENCE a serializing instruction. >> This is done by setting bit 1 of MSR 0xc0011029 (DE_CFG). Some families >> that support LFENCE do not have this MSR. For these families, the LFENCE >> instruction is already serializing. > > Does this require a microcode update?
No, it doesn't.
Thanks, Tom
> > -- > Brian Gerst >
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