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AJvYcCU/IHdu93PeIH/YmKgeonPd8s85KwWxJbccfL0dY6YcnFrW1iUjrN4ZMzL4GcynfHq3cpgTYDF/pxzk5HZlJpMY84quPR+qlXKijPBe34zS9hgQhpk= X-Gm-Message-State: AOJu0YzoYm4wmcJ9NFl2HOjE7qNeCjG8K4XF1YOZvvsZ5JdhQt5rtTXN kofEvIMjtZ83POc6T2N606bC3kwTfjE+i5spS69PqAhnFtN6ozMfE4amdQS3Tmcrm3y7R3ZZbvQ LaQ== X-Google-Smtp-Source: AGHT+IF1WA3mVZXk9S93pEq2eXLardKUPi+yfLeicmT6epShCKMtCcCE54tvymeWkFnvdj0Qbejb/rqSUKM= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:903:41cc:b0:1fd:87a7:1445 with SMTP id d9443c01a7336-1ff0489344bmr935735ad.9.1722038053119; Fri, 26 Jul 2024 16:54:13 -0700 (PDT) Date: Fri, 26 Jul 2024 16:51:55 -0700 In-Reply-To: <20240726235234.228822-1-seanjc@google.com> Mime-Version: 1.0 References: <20240726235234.228822-1-seanjc@google.com> X-Mailer: git-send-email 2.46.0.rc1.232.g9752f9e123-goog Message-ID: <20240726235234.228822-47-seanjc@google.com> Subject: [PATCH v12 46/84] KVM: x86/mmu: Put refcounted pages instead of blindly releasing pfns 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, David Matlack , David Stevens X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240726_165414_677701_BE477FC0 X-CRM114-Status: GOOD ( 11.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Now that all x86 page fault paths precisely track refcounted pages, use Use kvm_page_fault.refcounted_page to put references to struct page memory when finishing page faults. This is a baby step towards eliminating kvm_pfn_to_refcounted_page(). Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 146e57c9c86d..3cdb1bd80823 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4326,6 +4326,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu *vcpu, lockdep_assert_once(lockdep_is_held(&vcpu->kvm->mmu_lock) || r == RET_PF_RETRY); + if (!fault->refcounted_page) + return; + /* * If the page that KVM got from the *primary MMU* is writable, and KVM * installed or reused a SPTE, mark the page/folio dirty. Note, this @@ -4337,9 +4340,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu *vcpu, * folio dirty if KVM could locklessly make the SPTE writable. */ if (!fault->map_writable || r == RET_PF_RETRY) - kvm_release_pfn_clean(fault->pfn); + kvm_release_page_clean(fault->refcounted_page); else - kvm_release_pfn_dirty(fault->pfn); + kvm_release_page_dirty(fault->refcounted_page); } static int kvm_mmu_faultin_pfn_private(struct kvm_vcpu *vcpu,