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AJvYcCW+vOj0lPm6j3Wmt7mVbj+VMLWJzUtvtw8/1pV3AiwXH4pYtfPNYxaMHE9oFhBI0RGNCdqqgT2x+y7zzkmBnoHAzzdRc0l2fbaCUB4l X-Gm-Message-State: AOJu0YxIG/VFUVk1BJHy5QFRPOocGer0yrUBTaEXenFzxDbAJWI+7tJM mF3xiAsjAn1yoMIn23XEeuA5scYF6fu0iGfykLmXicslrHa87xy6SytsHkOQFM11jYIT7Jb8RPr OVQ== X-Google-Smtp-Source: AGHT+IHjueGi4XHTR80VLKYNSmezTNqicqTjy1hjWkoeqfVxP7xL/6dlCTgQugjOLvFflviFEVZzvXY7ZzM= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:903:41c6:b0:1fb:80c5:ce5d with SMTP id d9443c01a7336-1ff047b2dd6mr400915ad.4.1722038064523; Fri, 26 Jul 2024 16:54:24 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 26 Jul 2024 16:52:01 -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: <20240726235234.228822-53-seanjc@google.com> Subject: [PATCH v12 52/84] KVM: PPC: e500: Mark "struct page" pfn accessed before dropping mmu_lock 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" Mark pages accessed before dropping mmu_lock when faulting in guest memory so that shadow_map() can convert to kvm_release_faultin_page() without tripping its lockdep assertion on mmu_lock being held. Marking pages accessed outside of mmu_lock is ok (not great, but safe), but marking pages _dirty_ outside of mmu_lock can make filesystems unhappy. Signed-off-by: Sean Christopherson --- arch/powerpc/kvm/e500_mmu_host.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_h= ost.c index 5c2adfd19e12..334dd96f8081 100644 --- a/arch/powerpc/kvm/e500_mmu_host.c +++ b/arch/powerpc/kvm/e500_mmu_host.c @@ -498,11 +498,9 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc= _vcpu_e500 *vcpu_e500, kvmppc_mmu_flush_icache(pfn); =20 out: - spin_unlock(&kvm->mmu_lock); - /* Drop refcount on page, so that mmu notifiers can clear it */ kvm_release_pfn_clean(pfn); - + spin_unlock(&kvm->mmu_lock); return ret; } =20 --=20 2.46.0.rc1.232.g9752f9e123-goog