linux-kernel - [PATCH] x86/kvm/mmu: const-ify struct kvm_memory

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Date:   Wed, 28 Feb 2018 12:23:20 -1000
From:   Joey Pabalinas <joeypabalinas@...il.com>
To:     kvm@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/kvm/mmu: const-ify struct kvm_memory_slot pointers

Remove `(struct kvm_memory_slot *)` cast of the
`const struct kvm_memory_slot *memslot` parameter and
const-ify all references to that pointer down the
function call chain.

Signed-off-by: Joey Pabalinas <joeypabalinas@...il.com>

 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f551962ac29488431b..e6b32de4d7426fecb3 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1235,7 +1235,7 @@ static void pte_list_remove(u64 *spte, struct kvm_rmap_head *rmap_head)
 }
 
 static struct kvm_rmap_head *__gfn_to_rmap(gfn_t gfn, int level,
-					   struct kvm_memory_slot *slot)
+					   const struct kvm_memory_slot *slot)
 {
 	unsigned long idx;
 
@@ -1678,7 +1678,7 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
 
 struct slot_rmap_walk_iterator {
 	/* input fields. */
-	struct kvm_memory_slot *slot;
+	const struct kvm_memory_slot *slot;
 	gfn_t start_gfn;
 	gfn_t end_gfn;
 	int start_level;
@@ -1705,7 +1705,7 @@ rmap_walk_init_level(struct slot_rmap_walk_iterator *iterator, int level)
 
 static void
 slot_rmap_walk_init(struct slot_rmap_walk_iterator *iterator,
-		    struct kvm_memory_slot *slot, int start_level,
+		    const struct kvm_memory_slot *slot, int start_level,
 		    int end_level, gfn_t start_gfn, gfn_t end_gfn)
 {
 	iterator->slot = slot;
@@ -5081,7 +5081,7 @@ typedef bool (*slot_level_handler) (struct kvm *kvm, struct kvm_rmap_head *rmap_
 
 /* The caller should hold mmu-lock before calling this function. */
 static __always_inline bool
-slot_handle_level_range(struct kvm *kvm, struct kvm_memory_slot *memslot,
+slot_handle_level_range(struct kvm *kvm, const struct kvm_memory_slot *memslot,
 			slot_level_handler fn, int start_level, int end_level,
 			gfn_t start_gfn, gfn_t end_gfn, bool lock_flush_tlb)
 {
@@ -5111,7 +5111,7 @@ slot_handle_level_range(struct kvm *kvm, struct kvm_memory_slot *memslot,
 }
 
 static __always_inline bool
-slot_handle_level(struct kvm *kvm, struct kvm_memory_slot *memslot,
+slot_handle_level(struct kvm *kvm, const struct kvm_memory_slot *memslot,
 		  slot_level_handler fn, int start_level, int end_level,
 		  bool lock_flush_tlb)
 {
@@ -5138,7 +5138,7 @@ slot_handle_large_level(struct kvm *kvm, struct kvm_memory_slot *memslot,
 }
 
 static __always_inline bool
-slot_handle_leaf(struct kvm *kvm, struct kvm_memory_slot *memslot,
+slot_handle_leaf(struct kvm *kvm, const struct kvm_memory_slot *memslot,
 		 slot_level_handler fn, bool lock_flush_tlb)
 {
 	return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL,
@@ -5245,10 +5245,8 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
 void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
 				   const struct kvm_memory_slot *memslot)
 {
-	/* FIXME: const-ify all uses of struct kvm_memory_slot.  */
 	spin_lock(&kvm->mmu_lock);
-	slot_handle_leaf(kvm, (struct kvm_memory_slot *)memslot,
-			 kvm_mmu_zap_collapsible_spte, true);
+	slot_handle_leaf(kvm, memslot, kvm_mmu_zap_collapsible_spte, true);
 	spin_unlock(&kvm->mmu_lock);
 }
 
-- 
2.16.2

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