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AJvYcCUccwyL4fAXC16dJugZqtz5iVdmpVtcoLu/vIiZgqrkVDU6bXFFPLkQ7bUEGo/+1iGEhOM8M7YXG+nxqGQPF1RJgNRtGp8YMfLWfPZ2 X-Gm-Message-State: AOJu0YxWhumBkZcGJAlrAHANqdk6Oy8IoQKXfmRkG9VDzjX2MoiNivfF HAq28PixIVWraYMymVvhLxZmurPPLtoQWhoVIEwLVwSV0Y4XhvIg5AszZ8dW856TUlKiAnQVCtD Wgg== X-Google-Smtp-Source: AGHT+IFpeG9OHD4NFko0QV+s2bLKC/mOPhRZ2kdDMQUp9/Z6e7qKWnbHym6UcCLJKsXB8YuZDTrWfSN5tHI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:690c:14:b0:66a:764f:e57f with SMTP id 00721157ae682-67a0abd50e9mr49107b3.7.1722038055008; Fri, 26 Jul 2024 16:54:15 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 26 Jul 2024 16:51:56 -0700 In-Reply-To: <20240726235234.228822-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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: <20240726235234.228822-48-seanjc@google.com> Subject: [PATCH v12 47/84] KVM: x86/mmu: Don't mark unused faultin pages as accessed 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 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When finishing guest page faults, don't mark pages as accessed if KVM is resuming the guest _without_ installing a mapping, i.e. if the page isn't being used. While it's possible that marking the page accessed could avoid minor thrashing due to reclaiming a page that the guest is about to access, it's far more likely that the gfn=3D>pfn mapping was was invalidated, e.g. due a memslot change, or because the corresponding VMA is being modified. Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 3cdb1bd80823..95beb50748fc 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4339,7 +4339,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu= *vcpu, * fault handler, and so KVM must (somewhat) speculatively mark the * folio dirty if KVM could locklessly make the SPTE writable. */ - if (!fault->map_writable || r =3D=3D RET_PF_RETRY) + if (r =3D=3D RET_PF_RETRY) + kvm_release_page_unused(fault->refcounted_page); + else if (!fault->map_writable) kvm_release_page_clean(fault->refcounted_page); else kvm_release_page_dirty(fault->refcounted_page); --=20 2.46.0.rc1.232.g9752f9e123-goog