| Date | Tue, 22 Jun 2021 19:10:15 +0200 | From | Borislav Petkov <> | Subject | Re: [patch V3 56/66] x86/fpu: Dont store PKRU in xstate in fpu_reset_fpstate() |
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On Fri, Jun 18, 2021 at 04:19:19PM +0200, Thomas Gleixner wrote: > PKRU for a task is stored in task->thread.pkru when the task is scheduled > out. For 'current' the authoritative source of PKRU is the hardware. > > fpu_reset_fpstate() has two callers: > > 1) fpu__clear_user_states() for !FPU systems. For those PKRU is irrelevant > > 2) fpu_flush_thread() which is invoked from flush_thread(). flush_thread() > resets the hardware to the kernel restrictive default value. > > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > --- > arch/x86/kernel/fpu/core.c | 22 ++++------------------ > 1 file changed, 4 insertions(+), 18 deletions(-)
Reviewed-by: Borislav Petkov <bp@suse.de>
-- Regards/Gruss, Boris.
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