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KVM: x86/mmu: Add comment on __tdp_mmu_set_spte

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__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: Peter Feiner <pfeiner@google.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-3-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ben Gardon
2021-02-02 10:57:08 -08:00
committed by Paolo Bonzini
parent e28a436ca4
commit fe43fa2f40
1 changed files with 16 additions and 0 deletions
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16
arch/x86/kvm/mmu/tdp_mmu.c
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@@ -357,6 +357,22 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
new_spte, level); 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, static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
u64 new_spte, bool record_acc_track, u64 new_spte, bool record_acc_track,
bool record_dirty_log) bool record_dirty_log)