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Wed, 23 Jun 2021 20:59:50 -0700 (PDT) Received: from localhost ([2401:fa00:8f:203:5038:6344:7f10:3690]) by smtp.gmail.com with UTF8SMTPSA id a6sm1134854pfo.212.2021.06.23.20.59.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Jun 2021 20:59:49 -0700 (PDT) From: David Stevens X-Google-Original-From: David Stevens To: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Paolo Bonzini , Zhenyu Wang , Zhi Wang Subject: [PATCH 5/6] KVM: mmu: remove over-aggressive warnings Date: Thu, 24 Jun 2021 12:57:48 +0900 Message-Id: <20210624035749.4054934-6-stevensd@google.com> X-Mailer: git-send-email 2.32.0.93.g670b81a890-goog In-Reply-To: <20210624035749.4054934-1-stevensd@google.com> References: <20210624035749.4054934-1-stevensd@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Thu, 24 Jun 2021 14:15:11 +1000 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gvt-dev@lists.freedesktop.org, Wanpeng Li , kvm@vger.kernel.org, Will Deacon , Suzuki K Poulose , Sean Christopherson , Joerg Roedel , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-mips@vger.kernel.org, David Stevens , James Morse , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, Vitaly Kuznetsov , Alexandru Elisei , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Jim Mattson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: David Stevens Remove two warnings that require ref counts for pages to be non-zero, as mapped pfns from follow_pfn may not have an initialized ref count. Signed-off-by: David Stevens --- arch/x86/kvm/mmu/mmu.c | 7 ------- virt/kvm/kvm_main.c | 2 +- 2 files changed, 1 insertion(+), 8 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 8fa4a4a411ba..19249ad4b5b8 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -546,13 +546,6 @@ static int mmu_spte_clear_track_bits(u64 *sptep) pfn = spte_to_pfn(old_spte); - /* - * KVM does not hold the refcount of the page used by - * kvm mmu, before reclaiming the page, we should - * unmap it from mmu first. - */ - WARN_ON(!kvm_is_reserved_pfn(pfn) && !page_count(pfn_to_page(pfn))); - if (is_accessed_spte(old_spte)) kvm_set_pfn_accessed(pfn); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 898e90be4d0e..671361f30476 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -168,7 +168,7 @@ bool kvm_is_zone_device_pfn(kvm_pfn_t pfn) * the device has been pinned, e.g. by get_user_pages(). WARN if the * page_count() is zero to help detect bad usage of this helper. */ - if (!pfn_valid(pfn) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn)))) + if (!pfn_valid(pfn) || !page_count(pfn_to_page(pfn))) return false; return is_zone_device_page(pfn_to_page(pfn)); -- 2.32.0.93.g670b81a890-goog