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[2003:d8:2f2c:5500:988:23f9:faa0:7232]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454a997ae2esm56138585e9.9.2025.07.04.07.10.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Jul 2025 07:10:32 -0700 (PDT) Message-ID: <7ccee3be-6438-462d-8dce-efa58238f28d@redhat.com> Date: Fri, 4 Jul 2025 16:10:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 4/6] KVM: arm64: New function to determine hardware cache management support To: ankita@nvidia.com, jgg@nvidia.com, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, ryan.roberts@arm.com, shahuang@redhat.com, lpieralisi@kernel.org, ddutile@redhat.com, seanjc@google.com Cc: aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com, kjaju@nvidia.com, targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com, zhiw@nvidia.com, mochs@nvidia.com, udhoke@nvidia.com, dnigam@nvidia.com, alex.williamson@redhat.com, sebastianene@google.com, coltonlewis@google.com, kevin.tian@intel.com, yi.l.liu@intel.com, ardb@kernel.org, akpm@linux-foundation.org, gshan@redhat.com, linux-mm@kvack.org, tabba@google.com, qperret@google.com, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, maobibo@loongson.cn References: <20250621042111.3992-1-ankita@nvidia.com> <20250621042111.3992-5-ankita@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: u5m7pqjr5318b94j5c1koay7w9eyig7q X-Rspamd-Queue-Id: 916C3C001A X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1751638236-822428 X-HE-Meta: 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 3XqsA0Th 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 21.06.25 06:21, ankita@nvidia.com wrote: > From: Ankit Agrawal > > VM_PFNMAP VMA's are allowed to contain PTE's which point to physical > addresses that does not have a struct page and may not be in the kernel > direct map. > > However ARM64 KVM relies on a simple conversion from physaddr to a > kernel virtual address when it does cache maintenance as the CMO > instructions work on virtual addresses. This simple approach does not > work for physical addresses from VM_PFNMAP since those addresses may > not have a kernel virtual address, or it may be difficult to find it. > > Fortunately if the ARM64 CPU has two features, S2FWB and CACHE DIC, > then KVM no longer needs to do cache flushing and NOP's all the > CMOs. This has the effect of no longer requiring a KVA for addresses > mapped into the S2. > > Add a new function, kvm_arch_supports_cacheable_pfnmap(), to report > this capability. From a core prespective it means the arch can accept > a cachable VM_PFNMAP as a memslot. From an ARM64 perspective it means > that no KVA is required. > > CC: Jason Gunthorpe > CC: David Hildenbrand > CC: Donald Dutile > Reviewed-by: Catalin Marinas > Signed-off-by: Ankit Agrawal > --- Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb