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| author | Ashok Raj <ashok.raj@intel.com> | 2018-02-28 11:28:41 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-03-08 10:19:25 +0100 |
| commit | c182d2b7d0ca48e0d6ff16f7d883161238c447ed (patch) | |
| tree | dd43afcf1c29fba71f5c3fbf680de823a9daa2d5 /arch/x86/events | |
| parent | 854857f5944c59a881ff607b37ed9ed41d031a3b (diff) | |
| download | linux-c182d2b7d0ca48e0d6ff16f7d883161238c447ed.tar.bz2 | |
x86/microcode/intel: Check microcode revision before updating sibling threads
After updating microcode on one of the threads of a core, the other
thread sibling automatically gets the update since the microcode
resources on a hyperthreaded core are shared between the two threads.
Check the microcode revision on the CPU before performing a microcode
update and thus save us the WRMSR 0x79 because it is a particularly
expensive operation.
[ Borislav: Massage changelog and coding style. ]
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Ashok Raj <ashok.raj@intel.com>
Cc: Arjan Van De Ven <arjan.van.de.ven@intel.com>
Link: http://lkml.kernel.org/r/1519352533-15992-2-git-send-email-ashok.raj@intel.com
Link: https://lkml.kernel.org/r/20180228102846.13447-3-bp@alien8.de
Diffstat (limited to 'arch/x86/events')
0 files changed, 0 insertions, 0 deletions