x86/CPU/AMD: WARN when setting EFER.AUTOIBRS if and only if the WRMSR fails

Browse source

[ Upstream commit 492077668f ]

When ensuring EFER.AUTOIBRS is set, WARN only on a negative return code
from msr_set_bit(), as '1' is used to indicate the WRMSR was successful
('0' indicates the MSR bit was already set).

Fixes: 8cc68c9c9e ("x86/CPU/AMD: Make sure EFER[AIBRSE] is set")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/Z1MkNofJjt7Oq0G6@google.com
Closes: https://lore.kernel.org/all/20241205220604.GA2054199@thelio-3990X
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Sean Christopherson 2024-12-06 08:20:06 -08:00 • committed by Greg Kroah-Hartman

parent 412bf01fd5

commit 73bb82a425

1 changed files with 1 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/x86/kernel/cpu/amd.c

View file