Messages in this thread | | | Date | Wed, 9 Oct 2019 19:28:04 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH 5/6] x86/fpu/xstate: Define new functions for clearing fpregs and xstates |
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On Wed, Sep 25, 2019 at 08:10:21AM -0700, Yu-cheng Yu wrote: > From: Fenghua Yu <fenghua.yu@intel.com> > > Currently, fpu__clear() clears all fpregs and xstates. Once XSAVES > supervisor states are introduced, supervisor settings must remain active > for signals;
I could very well use an example here: for signal handling supervisor states, I'm guessing this would be something CET-related so some text about a usage scenario would be very helpful here.
> 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. > > Co-developed-by: Yu-cheng Yu <yu-cheng.yu@intel.com> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com> > Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
As before...
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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