linux-kernel - [RFC PATCH v3 1/2] KVM: x86/mmu: plumb struct kvm all the way to pte_list

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Date:   Mon, 28 Nov 2022 00:20:42 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mingwei Zhang <mizhang@...gle.com>,
        Nagareddy Reddy <nspreddy@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        David Matlack <dmatlack@...gle.com>
Subject: [RFC PATCH v3 1/2] KVM: x86/mmu: plumb struct kvm all the way to pte_list_remove()

Plumb struct kvm all the way to pte_list_remove() to allow the usage of
KVM_BUG() and/or KVM_BUG_ON(). This is the prepration step to depricate the
usage of BUG() in pte_list_remove() in shadow mmu.

Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 arch/x86/kvm/mmu/mmu.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 4736d7849c60..b5a44b8f5f7b 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -947,7 +947,8 @@ pte_list_desc_remove_entry(struct kvm_rmap_head *rmap_head,
 	mmu_free_pte_list_desc(desc);
 }
 
-static void pte_list_remove(u64 *spte, struct kvm_rmap_head *rmap_head)
+static void pte_list_remove(struct kvm *kvm, u64 *spte,
+			    struct kvm_rmap_head *rmap_head)
 {
 	struct pte_list_desc *desc;
 	struct pte_list_desc *prev_desc;
@@ -987,7 +988,7 @@ static void kvm_zap_one_rmap_spte(struct kvm *kvm,
 				  struct kvm_rmap_head *rmap_head, u64 *sptep)
 {
 	mmu_spte_clear_track_bits(kvm, sptep);
-	pte_list_remove(sptep, rmap_head);
+	pte_list_remove(kvm, sptep, rmap_head);
 }
 
 /* Return true if at least one SPTE was zapped, false otherwise */
@@ -1077,7 +1078,7 @@ static void rmap_remove(struct kvm *kvm, u64 *spte)
 	slot = __gfn_to_memslot(slots, gfn);
 	rmap_head = gfn_to_rmap(gfn, sp->role.level, slot);
 
-	pte_list_remove(spte, rmap_head);
+	pte_list_remove(kvm, spte, rmap_head);
 }
 
 /*
@@ -1730,16 +1731,16 @@ static void mmu_page_add_parent_pte(struct kvm_mmu_memory_cache *cache,
 	pte_list_add(cache, parent_pte, &sp->parent_ptes);
 }
 
-static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp,
+static void mmu_page_remove_parent_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
 				       u64 *parent_pte)
 {
-	pte_list_remove(parent_pte, &sp->parent_ptes);
+	pte_list_remove(kvm, parent_pte, &sp->parent_ptes);
 }
 
-static void drop_parent_pte(struct kvm_mmu_page *sp,
+static void drop_parent_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
 			    u64 *parent_pte)
 {
-	mmu_page_remove_parent_pte(sp, parent_pte);
+	mmu_page_remove_parent_pte(kvm, sp, parent_pte);
 	mmu_spte_clear_no_track(parent_pte);
 }
 
@@ -2382,7 +2383,7 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 		if (child->role.access == direct_access)
 			return;
 
-		drop_parent_pte(child, sptep);
+		drop_parent_pte(vcpu->kvm, child, sptep);
 		kvm_flush_remote_tlbs_with_address(vcpu->kvm, child->gfn, 1);
 	}
 }
@@ -2400,7 +2401,7 @@ static int mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
 			drop_spte(kvm, spte);
 		} else {
 			child = spte_to_child_sp(pte);
-			drop_parent_pte(child, spte);
+			drop_parent_pte(kvm, child, spte);
 
 			/*
 			 * Recursively zap nested TDP SPs, parentless SPs are
@@ -2431,13 +2432,13 @@ static int kvm_mmu_page_unlink_children(struct kvm *kvm,
 	return zapped;
 }
 
-static void kvm_mmu_unlink_parents(struct kvm_mmu_page *sp)
+static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp)
 {
 	u64 *sptep;
 	struct rmap_iterator iter;
 
 	while ((sptep = rmap_get_first(&sp->parent_ptes, &iter)))
-		drop_parent_pte(sp, sptep);
+		drop_parent_pte(kvm, sp, sptep);
 }
 
 static int mmu_zap_unsync_children(struct kvm *kvm,
@@ -2475,7 +2476,7 @@ static bool __kvm_mmu_prepare_zap_page(struct kvm *kvm,
 	++kvm->stat.mmu_shadow_zapped;
 	*nr_zapped = mmu_zap_unsync_children(kvm, sp, invalid_list);
 	*nr_zapped += kvm_mmu_page_unlink_children(kvm, sp, invalid_list);
-	kvm_mmu_unlink_parents(sp);
+	kvm_mmu_unlink_parents(kvm, sp);
 
 	/* Zapping children means active_mmu_pages has become unstable. */
 	list_unstable = *nr_zapped;
@@ -2839,7 +2840,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
 			u64 pte = *sptep;
 
 			child = spte_to_child_sp(pte);
-			drop_parent_pte(child, sptep);
+			drop_parent_pte(vcpu->kvm, child, sptep);
 			flush = true;
 		} else if (pfn != spte_to_pfn(*sptep)) {
 			pgprintk("hfn old %llx new %llx\n",
-- 
2.38.1.584.g0f3c55d4c2-goog