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| author | Fenghua Yu <fenghua.yu@intel.com> | 2020-05-12 07:54:39 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-05-13 13:41:50 +0200 |
| commit | b860eb8dce5906b14e3a7f3c771e0b3d6ef61b94 (patch) | |
| tree | 744b2c8774d4b422729166a74f4d30bf749adb5e /arch/x86/include/asm/fpu | |
| parent | 71581eefd7a0a81b1af7d7c93641925a01d70a9a (diff) | |
| download | linux-b860eb8dce5906b14e3a7f3c771e0b3d6ef61b94.tar.bz2 | |
x86/fpu/xstate: Define new functions for clearing fpregs and xstates
Currently, fpu__clear() clears all fpregs and xstates. Once XSAVES
supervisor states are introduced, supervisor settings (e.g. CET xstates)
must remain active for signals; It is necessary to have separate functions:
- Create fpu__clear_user_states(): clear only user settings for signals;
- Create fpu__clear_all(): clear both user and supervisor settings in
flush_thread().
Also modify copy_init_fpstate_to_fpregs() to take a mask from above two
functions.
Remove obvious side-comment in fpu__clear(), while at it.
[ bp: Make the second argument of fpu__clear() bool after requesting it
a bunch of times during review.
- Add a comment about copy_init_fpstate_to_fpregs() locking needs. ]
Co-developed-by: Yu-cheng Yu <yu-cheng.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/20200512145444.15483-6-yu-cheng.yu@intel.com
Diffstat (limited to 'arch/x86/include/asm/fpu')
| -rw-r--r-- | arch/x86/include/asm/fpu/internal.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index ccb1bb32ad7d..a42fcb4b690d 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -31,7 +31,8 @@ extern void fpu__save(struct fpu *fpu); extern int fpu__restore_sig(void __user *buf, int ia32_frame); extern void fpu__drop(struct fpu *fpu); extern int fpu__copy(struct task_struct *dst, struct task_struct *src); -extern void fpu__clear(struct fpu *fpu); +extern void fpu__clear_user_states(struct fpu *fpu); +extern void fpu__clear_all(struct fpu *fpu); extern int fpu__exception_code(struct fpu *fpu, int trap_nr); extern int dump_fpu(struct pt_regs *ptregs, struct user_i387_struct *fpstate); |