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Fri, 19 Dec 2025 01:06:18 -0800 (PST) Received: from [192.168.88.32] ([216.128.11.227]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47be3963fc3sm32985095e9.0.2025.12.19.01.06.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Dec 2025 01:06:17 -0800 (PST) Message-ID: <63de3a12-36bc-45bf-a3e5-89246f4ec73f@redhat.com> Date: Fri, 19 Dec 2025 10:06:16 +0100 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next ] vdpa: fix caching attributes of MMIO regions by setting them explicitly To: mst@redhat.com Cc: virtualization@lists.linux.dev, eperezma@redhat.com, kvm@vger.kernel.org, jerinj@marvell.com, ndabilpuram@marvell.com, schalla@marvell.com, Kommula Shiva Shankar , netdev@vger.kernel.org, jasowang@redhat.com References: <20251216175918.544641-1-kshankar@marvell.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20251216175918.544641-1-kshankar@marvell.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 12/16/25 6:59 PM, Kommula Shiva Shankar wrote: > Explicitly set non-cached caching attributes for MMIO regions. > Default write-back mode can cause CPU to cache device memory, > causing invalid reads and unpredictable behavior. > > Invalid read and write issues were observed on ARM64 when mapping the > notification area to userspace via mmap. > > Signed-off-by: Kommula Shiva Shankar @Micheal: despite the net-next prefix, I assume this patch will go via your tree, as it looks unrelated from networking. Cheers, Paolo