diff options
| author | Andrew Cooper <andrew.cooper3@citrix.com> | 2024-08-22 00:39:05 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-08-25 19:23:00 +0200 |
| commit | efe508816d2caf83536ff2f308e09043380fb2b7 (patch) | |
| tree | 23bddf21cd6629fdb537875fa348a32454dd0dce /arch/um/drivers | |
| parent | 0dfac6f267fa091aa348c6a6742b463c9e7c98e3 (diff) | |
x86/msr: Switch between WRMSRNS and WRMSR with the alternatives mechanism
Per the discussion about FRED MSR writes with WRMSRNS instruction [1],
use the alternatives mechanism to choose WRMSRNS when it's available,
otherwise fallback to WRMSR.
Remove the dependency on X86_FEATURE_WRMSRNS as WRMSRNS is no longer
dependent on FRED.
[1] https://lore.kernel.org/lkml/15f56e6a-6edd-43d0-8e83-bb6430096514@citrix.com/
Use DS prefix to pad WRMSR instead of a NOP. The prefix is ignored. At
least that's the current information from the hardware folks.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20240822073906.2176342-3-xin@zytor.com
Diffstat (limited to 'arch/um/drivers')
0 files changed, 0 insertions, 0 deletions