linux-kernel - [Patch v3 2/9] KVM: x86/mmu: Remove zapped_obsolete_pages from struct kvm

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Message-ID: <20221222023457.1764-3-vipinsh@google.com>
Date:   Wed, 21 Dec 2022 18:34:50 -0800
From:   Vipin Sharma <vipinsh@...gle.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, bgardon@...gle.com,
        dmatlack@...gle.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vipin Sharma <vipinsh@...gle.com>
Subject: [Patch v3 2/9] KVM: x86/mmu: Remove zapped_obsolete_pages from struct kvm_arch{}

zapped_obsolete_pages list was used in struct kvm_arch{} to provide
pages for KVM MMU shrinker. This is not needed now as KVM MMU shrinker
has been repurposed to free shadow page caches and not
zapped_obsolete_pages.

Remove zapped_obsolete_pages from struct kvm_arch{} and use local list
in kvm_zap_obsolete_pages().

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
---
 arch/x86/include/asm/kvm_host.h | 1 -
 arch/x86/kvm/mmu/mmu.c          | 8 ++++----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 89cc809e4a00..f89f02e18080 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1215,7 +1215,6 @@ struct kvm_arch {
 	u8 mmu_valid_gen;
 	struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
 	struct list_head active_mmu_pages;
-	struct list_head zapped_obsolete_pages;
 	/*
 	 * A list of kvm_mmu_page structs that, if zapped, could possibly be
 	 * replaced by an NX huge page.  A shadow page is on this list if its
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 157417e1cb6e..3364760a1695 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5987,6 +5987,7 @@ static void kvm_zap_obsolete_pages(struct kvm *kvm)
 {
 	struct kvm_mmu_page *sp, *node;
 	int nr_zapped, batch = 0;
+	LIST_HEAD(zapped_pages);
 	bool unstable;
 
 restart:
@@ -6019,8 +6020,8 @@ static void kvm_zap_obsolete_pages(struct kvm *kvm)
 			goto restart;
 		}
 
-		unstable = __kvm_mmu_prepare_zap_page(kvm, sp,
-				&kvm->arch.zapped_obsolete_pages, &nr_zapped);
+		unstable = __kvm_mmu_prepare_zap_page(kvm, sp, &zapped_pages,
+						      &nr_zapped);
 		batch += nr_zapped;
 
 		if (unstable)
@@ -6036,7 +6037,7 @@ static void kvm_zap_obsolete_pages(struct kvm *kvm)
 	 * kvm_mmu_load()), and the reload in the caller ensure no vCPUs are
 	 * running with an obsolete MMU.
 	 */
-	kvm_mmu_commit_zap_page(kvm, &kvm->arch.zapped_obsolete_pages);
+	kvm_mmu_commit_zap_page(kvm, &zapped_pages);
 }
 
 /*
@@ -6112,7 +6113,6 @@ int kvm_mmu_init_vm(struct kvm *kvm)
 	int r;
 
 	INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
-	INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
 	INIT_LIST_HEAD(&kvm->arch.possible_nx_huge_pages);
 	spin_lock_init(&kvm->arch.mmu_unsync_pages_lock);
 
-- 
2.39.0.314.g84b9a713c41-goog