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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2018-01-08 23:09:21 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-01-09 01:43:10 +0100 |
| commit | e4d0e84e490790798691aaa0f2e598637f1867ec (patch) | |
| tree | 66d52c2120951105b4b688a8615a56f89551e4bf /scripts | |
| parent | x86/mm/pti: Remove dead logic in pti_user_pagetable_walk*() (diff) | |
| download | linux-e4d0e84e490790798691aaa0f2e598637f1867ec.tar.xz linux-e4d0e84e490790798691aaa0f2e598637f1867ec.zip | |
x86/cpu/AMD: Make LFENCE a serializing instruction
To aid in speculation control, make LFENCE a serializing instruction
since it has less overhead than MFENCE. This is done by setting bit 1
of MSR 0xc0011029 (DE_CFG). Some families that support LFENCE do not
have this MSR. For these families, the LFENCE instruction is already
serializing.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Paul Turner <pjt@google.com>
Link: https://lkml.kernel.org/r/20180108220921.12580.71694.stgit@tlendack-t1.amdoffice.net
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions