diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-10-21 15:55:19 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-10-26 10:52:35 +0200 |
| commit | 5529acf47ec31ece0815f69d43f5e6a1e485a0f3 (patch) | |
| tree | 7e310408156c2da2497511d8bf13971836292078 /arch/x86/kernel/fpu/core.c | |
| parent | 8bf26758ca9659866b844dd51037314b4c0fa6bd (diff) | |
x86/fpu: Add sanity checks for XFD
Add debug functionality to ensure that the XFD MSR is up to date for XSAVE*
and XRSTOR* operations.
[ tglx: Improve comment. ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211021225527.10184-16-chang.seok.bae@intel.com
Diffstat (limited to 'arch/x86/kernel/fpu/core.c')
| -rw-r--r-- | arch/x86/kernel/fpu/core.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 3b72cddf990d..b5f5b08b84d7 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -166,7 +166,7 @@ void restore_fpregs_from_fpstate(struct fpstate *fpstate, u64 mask) */ mask = fpu_kernel_cfg.max_features & mask; - os_xrstor(&fpstate->regs.xsave, mask); + os_xrstor(fpstate, mask); } else { if (use_fxsr()) fxrstor(&fpstate->regs.fxsave); @@ -534,7 +534,7 @@ void fpu__drop(struct fpu *fpu) static inline void restore_fpregs_from_init_fpstate(u64 features_mask) { if (use_xsave()) - os_xrstor(&init_fpstate.regs.xsave, features_mask); + os_xrstor(&init_fpstate, features_mask); else if (use_fxsr()) fxrstor(&init_fpstate.regs.fxsave); else @@ -591,9 +591,8 @@ void fpu__clear_user_states(struct fpu *fpu) * corresponding registers. */ if (xfeatures_mask_supervisor() && - !fpregs_state_valid(fpu, smp_processor_id())) { - os_xrstor(&fpu->fpstate->regs.xsave, xfeatures_mask_supervisor()); - } + !fpregs_state_valid(fpu, smp_processor_id())) + os_xrstor_supervisor(fpu->fpstate); /* Reset user states in registers. */ restore_fpregs_from_init_fpstate(XFEATURE_MASK_USER_RESTORE); |