Commit 76e1be83 authored by Ben Gardon's avatar Ben Gardon Committed by Yu Zhang
Browse files

KVM: x86/mmu: Add comment on __tdp_mmu_set_spte 

mainline inclusion
from mainline-v5.12-rc1
commit fe43fa2f
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I7S3VQ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fe43fa2f407b9d513f7bcf18142e14e1bf1508d6



----------------------------------------------------------------------

__tdp_mmu_set_spte is a very important function in the TDP MMU which
already accepts several arguments and will take more in future commits.
To offset this complexity, add a comment to the function describing each
of the arguemnts.

No functional change intended.

Reviewed-by: default avatarPeter Feiner <pfeiner@google.com>
Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarBen Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-3-bgardon@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarYu Zhang <yu.c.zhang@linux.intel.com>
parent ce0dc002

arch/x86/kvm/mmu/tdp_mmu.c

+16 −0
Original line number Diff line number Diff line
@@ -357,6 +357,22 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 
				      new_spte, level);

}



/*

 * __tdp_mmu_set_spte - Set a TDP MMU SPTE and handle the associated bookkeeping

 * @kvm: kvm instance

 * @iter: a tdp_iter instance currently on the SPTE that should be set

 * @new_spte: The value the SPTE should be set to

 * @record_acc_track: Notify the MM subsystem of changes to the accessed state

 *		      of the page. Should be set unless handling an MMU

 *		      notifier for access tracking. Leaving record_acc_track

 *		      unset in that case prevents page accesses from being

 *		      double counted.

 * @record_dirty_log: Record the page as dirty in the dirty bitmap if

 *		      appropriate for the change being made. Should be set

 *		      unless performing certain dirty logging operations.

 *		      Leaving record_dirty_log unset in that case prevents page

 *		      writes from being double counted.

 */

static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,

				      u64 new_spte, bool record_acc_track,

				      bool record_dirty_log)