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[2003:d8:2f2c:5500:988:23f9:faa0:7232]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b47285dda7sm2614728f8f.99.2025.07.04.06.57.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Jul 2025 06:57:19 -0700 (PDT) Message-ID: <126f839c-f0e5-42a4-a172-2cefd59e5750@redhat.com> Date: Fri, 4 Jul 2025 15:57:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 1/6] KVM: arm64: Rename the device variable to s2_force_noncacheable 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> <20250621042111.3992-2-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: xr5qtj81rjspd6euu1tk7i7jfoxmbdkr X-Rspamd-Queue-Id: 94BA78000D X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1751637443-121120 X-HE-Meta: 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 JcxHKvpE 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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 > > For cache maintenance on a region, ARM KVM relies on that > region to be mapped to the Kernal virtual address as CMOs > operate on VA. > > Currently the device variable is effectively trying to setup > the S2 mapping as non cacheable for memory regions that are > not mapped in the Kernel VA. This could be either device or > Normal_NC depending on the VM_ALLOW_ANY_UNCACHED flag in the > VMA. > > Thus "device" could be better renamed to s2_force_noncacheable > which implies that it is ensuring that region be mapped as > non-cacheable. > > CC: Catalin Marinas > Suggested-by: Jason Gunthorpe > Signed-off-by: Ankit Agrawal > --- Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb