git: DragonFly_RELEASE_5_6 kernel - Zen 2 - Make sure %fs's selector is loaded in AP bootstrap
dillon at crater.dragonflybsd.org
Thu Jul 11 00:00:03 PDT 2019
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Wed Jul 10 23:57:02 2019 -0700
kernel - Zen 2 - Make sure %fs's selector is loaded in AP bootstrap
* Issue load_fs() in the AP bootstrap. It appears that Zen 2 handles
%fs in a weird way when the selector isn't loaded, causing the first
wrmsr(MSR_FSBASE) to quietly fail, and possibly others too.
* For good measure, also issue load_ds() and load_es().
* Fixes DragonFlyBSD's boot on Zen 2.
Summary of changes:
sys/platform/pc64/x86_64/mp_machdep.c | 5 +++++
1 file changed, 5 insertions(+)
DragonFly BSD source repository
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