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| author | Kan Liang <kan.liang@linux.intel.com> | 2020-07-03 15:49:27 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-07-08 12:38:56 +0300 |
| commit | 50f408d96d4d1a945d2c50c5fd8ed400883edf0e (patch) | |
| tree | 4c3cd86d7697a86da65cacdc2765d076270a685b /arch/x86/events/perf_event.h | |
| parent | f0dccc9da4c0fda049e99326f85db8c242fd781f (diff) | |
| download | linux-50f408d96d4d1a945d2c50c5fd8ed400883edf0e.tar.xz | |
x86/fpu/xstate: Add helpers for LBR dynamic supervisor feature
The perf subsystem will only need to save/restore the LBR state.
However, the existing helpers save all supported supervisor states to a
kernel buffer, which will be unnecessary. Two helpers are introduced to
only save/restore requested dynamic supervisor states. The supervisor
features in XFEATURE_MASK_SUPERVISOR_SUPPORTED and
XFEATURE_MASK_SUPERVISOR_UNSUPPORTED mask cannot be saved/restored using
these helpers.
The helpers will be used in the following patch.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Link: https://lkml.kernel.org/r/1593780569-62993-22-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to 'arch/x86/events/perf_event.h')
0 files changed, 0 insertions, 0 deletions