SVNews r327517

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2018-01-03 11:23:47 - r327517 by kib (Konstantin Belousov)

Complete list of files affected by revision r327517:

(Note: At the moment, these links point to ViewVC on They are probably slow. Do not overuse.)

  History   Contents   Diff   MODIFY   /head/sys/x86/x86/local_apic.c  

Commit message:

Use the new SDM-approved way to serialize x2APIC MSR writes.

SDM editions 64 and below stated that it is enough to use MFENCe or
LFENCE to serialize x2APIC register writes. New edition 65 requires
either full serialization instruction or MFENCE;LFENCE sequence. Use
the later, FreeBSD needs serialization to ensure that writes done
before IPI request are visible to the target IPI CPU.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week


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