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([2404:f801:9000:1a:efeb::a31c]) by smtp.gmail.com with ESMTPSA id i18sm6579059pfq.168.2021.04.14.07.12.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Apr 2021 07:12:16 -0700 (PDT) Subject: Re: [RFC V2 PATCH 9/12] swiotlb: Add bounce buffer remap address setting function To: Christoph Hellwig Cc: konrad.wilk@oracle.com, m.szyprowski@samsung.com, robin.murphy@arm.com, Tianyu Lan , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com References: <20210413152217.3386288-1-ltykernel@gmail.com> <20210413152217.3386288-10-ltykernel@gmail.com> <20210414064358.GA25877@lst.de> From: Tianyu Lan Message-ID: <963fc95f-915e-99a2-aa5c-63ae8e2c6591@gmail.com> Date: Wed, 14 Apr 2021 22:12:12 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: <20210414064358.GA25877@lst.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/14/2021 2:43 PM, Christoph Hellwig wrote: > On Tue, Apr 13, 2021 at 11:22:14AM -0400, Tianyu Lan wrote: >> From: Tianyu Lan >> >> For Hyper-V isolation VM with AMD SEV SNP, the bounce buffer(shared memory) >> needs to be accessed via extra address space(e.g address above bit39). >> Hyper-V code may remap extra address space outside of swiotlb. swiotlb_bounce() >> needs to use remap virtual address to copy data from/to bounce buffer. Add >> new interface swiotlb_set_bounce_remap() to do that. > > I have no way to review what this actually doing when you only Cc me > on a single patch. Please make sure everyone is Cced on the whole > series to enable proper review. > Sure. I will resend all patches. Thanks for reminder.