linux-kernel - [PATCH 4/7] KVM: x86/MMU: Move rmap_can_add() and rmap

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Date:   Tue,  6 Dec 2022 17:35:58 +0000
From:   Ben Gardon <bgardon@...gle.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Vipin Sharma <vipinsh@...gle.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: [PATCH 4/7] KVM: x86/MMU: Move rmap_can_add() and rmap_remove() to rmap.c

Move the functions to check if an entry can be added to an rmap and for
removing elements from an rmap to rmap.(c|h).

No functional change intended.

Signed-off-by: Ben Gardon <bgardon@...gle.com>
---
 arch/x86/kvm/mmu/mmu.c          | 34 +--------------------------------
 arch/x86/kvm/mmu/mmu_internal.h |  1 +
 arch/x86/kvm/mmu/rmap.c         | 32 +++++++++++++++++++++++++++++++
 arch/x86/kvm/mmu/rmap.h         |  3 +++
 4 files changed, 37 insertions(+), 33 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index f8d7201210c8..52e487d89d54 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -658,7 +658,7 @@ static void mmu_free_memory_caches(struct kvm_vcpu *vcpu)
 
 static bool sp_has_gptes(struct kvm_mmu_page *sp);
 
-static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index)
+gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index)
 {
 	if (sp->role.passthrough)
 		return sp->gfn;
@@ -891,38 +891,6 @@ static bool kvm_zap_all_rmap_sptes(struct kvm *kvm,
 	return true;
 }
 
-static bool rmap_can_add(struct kvm_vcpu *vcpu)
-{
-	struct kvm_mmu_memory_cache *mc;
-
-	mc = &vcpu->arch.mmu_pte_list_desc_cache;
-	return kvm_mmu_memory_cache_nr_free_objects(mc);
-}
-
-static void rmap_remove(struct kvm *kvm, u64 *spte)
-{
-	struct kvm_memslots *slots;
-	struct kvm_memory_slot *slot;
-	struct kvm_mmu_page *sp;
-	gfn_t gfn;
-	struct kvm_rmap_head *rmap_head;
-
-	sp = sptep_to_sp(spte);
-	gfn = kvm_mmu_page_get_gfn(sp, spte_index(spte));
-
-	/*
-	 * Unlike rmap_add, rmap_remove does not run in the context of a vCPU
-	 * so we have to determine which memslots to use based on context
-	 * information in sp->role.
-	 */
-	slots = kvm_memslots_for_spte_role(kvm, sp->role);
-
-	slot = __gfn_to_memslot(slots, gfn);
-	rmap_head = gfn_to_rmap(gfn, sp->role.level, slot);
-
-	pte_list_remove(spte, rmap_head);
-}
-
 static void drop_spte(struct kvm *kvm, u64 *sptep)
 {
 	u64 old_spte = mmu_spte_clear_track_bits(kvm, sptep);
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index cd1c8f32269d..3de703c2a5d4 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -318,4 +318,5 @@ void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc);
 void track_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp);
 void untrack_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp);
 
+gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index);
 #endif /* __KVM_X86_MMU_INTERNAL_H */
diff --git a/arch/x86/kvm/mmu/rmap.c b/arch/x86/kvm/mmu/rmap.c
index 272e89147d96..6833676aa9ea 100644
--- a/arch/x86/kvm/mmu/rmap.c
+++ b/arch/x86/kvm/mmu/rmap.c
@@ -208,3 +208,35 @@ struct kvm_rmap_head *gfn_to_rmap(gfn_t gfn, int level,
 	idx = gfn_to_index(gfn, slot->base_gfn, level);
 	return &slot->arch.rmap[level - PG_LEVEL_4K][idx];
 }
+
+bool rmap_can_add(struct kvm_vcpu *vcpu)
+{
+	struct kvm_mmu_memory_cache *mc;
+
+	mc = &vcpu->arch.mmu_pte_list_desc_cache;
+	return kvm_mmu_memory_cache_nr_free_objects(mc);
+}
+
+void rmap_remove(struct kvm *kvm, u64 *spte)
+{
+	struct kvm_memslots *slots;
+	struct kvm_memory_slot *slot;
+	struct kvm_mmu_page *sp;
+	gfn_t gfn;
+	struct kvm_rmap_head *rmap_head;
+
+	sp = sptep_to_sp(spte);
+	gfn = kvm_mmu_page_get_gfn(sp, spte_index(spte));
+
+	/*
+	 * Unlike rmap_add, rmap_remove does not run in the context of a vCPU
+	 * so we have to determine which memslots to use based on context
+	 * information in sp->role.
+	 */
+	slots = kvm_memslots_for_spte_role(kvm, sp->role);
+
+	slot = __gfn_to_memslot(slots, gfn);
+	rmap_head = gfn_to_rmap(gfn, sp->role.level, slot);
+
+	pte_list_remove(spte, rmap_head);
+}
diff --git a/arch/x86/kvm/mmu/rmap.h b/arch/x86/kvm/mmu/rmap.h
index 45732eda57e5..81df186ba3c3 100644
--- a/arch/x86/kvm/mmu/rmap.h
+++ b/arch/x86/kvm/mmu/rmap.h
@@ -51,4 +51,7 @@ u64 *rmap_get_next(struct rmap_iterator *iter);
 
 struct kvm_rmap_head *gfn_to_rmap(gfn_t gfn, int level,
 				  const struct kvm_memory_slot *slot);
+
+bool rmap_can_add(struct kvm_vcpu *vcpu);
+void rmap_remove(struct kvm *kvm, u64 *spte);
 #endif /* __KVM_X86_MMU_RMAP_H */
-- 
2.39.0.rc0.267.gcb52ba06e7-goog