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| author | Yu-cheng Yu <yu-cheng.yu@intel.com> | 2020-05-12 07:54:37 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-05-13 10:31:07 +0200 |
| commit | 524bb73bc15c56f5587e33c817e103a259b019d2 (patch) | |
| tree | e539de40d35be74e8b43cb9daec3e80f773d70f3 /arch/x86/kernel/signal.c | |
| parent | 8ab22804efefea9ecf3c68aa00f1fa69c70fcfad (diff) | |
x86/fpu/xstate: Separate user and supervisor xfeatures mask
Before the introduction of XSAVES supervisor states, 'xfeatures_mask' is
used at various places to determine XSAVE buffer components and XCR0 bits.
It contains only user xstates. To support supervisor xstates, it is
necessary to separate user and supervisor xstates:
- First, change 'xfeatures_mask' to 'xfeatures_mask_all', which represents
the full set of bits that should ever be set in a kernel XSAVE buffer.
- Introduce xfeatures_mask_supervisor() and xfeatures_mask_user() to
extract relevant xfeatures from xfeatures_mask_all.
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20200512145444.15483-4-yu-cheng.yu@intel.com
Diffstat (limited to 'arch/x86/kernel/signal.c')
0 files changed, 0 insertions, 0 deletions