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SubjectRe: [PATCH v3 10/21] x86/fpu/xstate: Update xstate save function to support dynamic xstate
On Feb 8, 2021, at 04:33, Borislav Petkov <> wrote:
> 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."

Yes, I will change like that. Thanks.

>> No functional change until the kernel supports dynamic user states.
> Same comment as before.

This needs to be removed as per your comment [1].


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