This is a note to let you know that I've just added the patch titled
KVM: x86/mmu: Add comment on __tdp_mmu_set_spte
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-mmu-add-comment-on-__tdp_mmu_set_spte.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit de4f8e1d8284e0976baa40ef79d6e0f6cbf5c6c6
Author: Ben Gardon <bgardon@xxxxxxxxxx>
Date: Tue Feb 2 10:57:08 2021 -0800
KVM: x86/mmu: Add comment on __tdp_mmu_set_spte
[ Upstream commit 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: Peter Feiner <pfeiner@xxxxxxxxxx>
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Ben Gardon <bgardon@xxxxxxxxxx>
Message-Id: <20210202185734.1680553-3-bgardon@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 34ef3e1a0f84..f88404033e0c 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -395,6 +395,22 @@ 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)
