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AJvYcCWdIFmANv63FHOSfvw0ckokXkuot8vYbp4lT29LPBitOMG499nYiSdjpGS5TpXtvi1l0o5IO2w=@lists.linux.dev X-Gm-Message-State: AOJu0YyBmfzgcAqNuafyEyuZuSI1hXOCvwN95jr7BMhhf4R4buFHGU4X LCl6ZKwjOpcwxD9jr8aSf5DWjMpxQcOa4RzrhCTjo7PdxXVCxkpwx4SdoNlcWAqYeEvbeNhg7pD OjA== X-Google-Smtp-Source: AGHT+IHfwq/leOSDpGNmElHsEevN2NLhktzxL5WWYsNV7s51yqV4fIBatX1NQsHzbv29AfLNcoyCuLVeClM= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:9d:3983:ac13:c240]) (user=seanjc job=sendgmr) by 2002:a17:902:e745:b0:20c:857b:5dcb with SMTP id d9443c01a7336-20c857b62ffmr639275ad.4.1728584868183; Thu, 10 Oct 2024 11:27:48 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 10 Oct 2024 11:24:25 -0700 In-Reply-To: <20241010182427.1434605-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241010182427.1434605-1-seanjc@google.com> X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog Message-ID: <20241010182427.1434605-84-seanjc@google.com> Subject: [PATCH v13 83/85] KVM: arm64: Don't mark "struct page" accessed when making SPTE young From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, "=?UTF-8?q?Alex=20Benn=C3=A9e?=" , Yan Zhao , David Matlack , David Stevens , Andrew Jones Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Don't mark pages/folios as accessed in the primary MMU when making a SPTE young in KVM's secondary MMU, as doing so relies on kvm_pfn_to_refcounted_page(), and generally speaking is unnecessary and wasteful. KVM participates in page aging via mmu_notifiers, so there's no need to push "accessed" updates to the primary MMU. Dropping use of kvm_set_pfn_accessed() also paves the way for removing kvm_pfn_to_refcounted_page() and all its users. Tested-by: Alex Benn=C3=A9e Signed-off-by: Sean Christopherson --- arch/arm64/include/asm/kvm_pgtable.h | 4 +--- arch/arm64/kvm/hyp/pgtable.c | 7 ++----- arch/arm64/kvm/mmu.c | 6 +----- 3 files changed, 4 insertions(+), 13 deletions(-) diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/= kvm_pgtable.h index 03f4c3d7839c..aab04097b505 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -674,10 +674,8 @@ int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *p= gt, u64 addr, u64 size); * * If there is a valid, leaf page-table entry used to translate @addr, the= n * set the access flag in that entry. - * - * Return: The old page-table entry prior to setting the flag, 0 on failur= e. */ -kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr); +void kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr); =20 /** * kvm_pgtable_stage2_test_clear_young() - Test and optionally clear the a= ccess diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index b11bcebac908..40bd55966540 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -1245,19 +1245,16 @@ int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable= *pgt, u64 addr, u64 size) NULL, NULL, 0); } =20 -kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr) +void kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr) { - kvm_pte_t pte =3D 0; int ret; =20 ret =3D stage2_update_leaf_attrs(pgt, addr, 1, KVM_PTE_LEAF_ATTR_LO_S2_AF= , 0, - &pte, NULL, + NULL, NULL, KVM_PGTABLE_WALK_HANDLE_FAULT | KVM_PGTABLE_WALK_SHARED); if (!ret) dsb(ishst); - - return pte; } =20 struct stage2_age_data { diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 4054356c9712..e2ae9005e333 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1706,18 +1706,14 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, ph= ys_addr_t fault_ipa, /* Resolve the access fault by making the page young again. */ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_i= pa) { - kvm_pte_t pte; struct kvm_s2_mmu *mmu; =20 trace_kvm_access_fault(fault_ipa); =20 read_lock(&vcpu->kvm->mmu_lock); mmu =3D vcpu->arch.hw_mmu; - pte =3D kvm_pgtable_stage2_mkyoung(mmu->pgt, fault_ipa); + kvm_pgtable_stage2_mkyoung(mmu->pgt, fault_ipa); read_unlock(&vcpu->kvm->mmu_lock); - - if (kvm_pte_valid(pte)) - kvm_set_pfn_accessed(kvm_pte_to_pfn(pte)); } =20 /** --=20 2.47.0.rc1.288.g06298d1525-goog