On Wed, Dec 23, 2020 at 07:57:06AM -0800, Chang S. Bae wrote:
> copy_xregs_to_kernel() used to save all user states in a kernel buffer.
> When the dynamic user state is enabled, it becomes conditional which state
> to be saved.
>
> fpu->state_mask can indicate which state components are reserved to be
> saved in XSAVE buffer. Use it as XSAVE's instruction mask to select states.
>
> KVM used to save all xstate via copy_xregs_to_kernel(). Update KVM to set a
> valid fpu->state_mask, which will be necessary to correctly handle dynamic
> state buffers.
All this commit message should say is something along the lines of
"extend copy_xregs_to_kernel() to receive a mask argument of which
states to save, in preparation of dynamic states handling."
> No functional change until the kernel supports dynamic user states.
Same comment as before.
--
Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG
Nürnberg
