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SubjectRe: [PATCH v1 1/3] x86/cpu/AMD: Make LFENCE a serializing instruction
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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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