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([2404:f801:9000:1a:efea::50b]) by smtp.gmail.com with ESMTPSA id q5sm2573972pfu.185.2021.08.13.09.43.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Aug 2021 09:43:32 -0700 (PDT) Subject: Re: [Resend RFC PATCH V4 09/13] x86/Swiotlb/HV: Add Swiotlb bounce buffer remap function for HV IVM To: Christoph Hellwig Cc: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, m.szyprowski@samsung.com, robin.murphy@arm.com, kirill.shutemov@linux.intel.com, akpm@linux-foundation.org, rppt@kernel.org, Tianyu.Lan@microsoft.com, thomas.lendacky@amd.com, ardb@kernel.org, robh@kernel.org, nramas@linux.microsoft.com, pgonda@google.com, martin.b.radev@gmail.com, david@redhat.com, krish.sadhukhan@oracle.com, saravanand@fb.com, xen-devel@lists.xenproject.org, keescook@chromium.org, rientjes@google.com, hannes@cmpxchg.org, michael.h.kelley@microsoft.com, iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, brijesh.singh@amd.com, anparri@microsoft.com References: <20210707154629.3977369-1-ltykernel@gmail.com> <20210707154629.3977369-10-ltykernel@gmail.com> <20210720135437.GA13554@lst.de> From: Tianyu Lan Message-ID: <20926467-6f67-9549-1c34-1841f597b977@gmail.com> Date: Sat, 14 Aug 2021 00:43:16 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210720135437.GA13554@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-hyperv@vger.kernel.org Hi Christoph: I followed your this suggestion to rework the latest version(https://lkml.org/lkml/2021/8/9/805). I just remove the arch prefix from your suggested name arch_dma_map_decrypted because the platform may populate their map/umap callback in the ops. But from your latest comment(https://lkml.org/lkml/2021/8/12/149), these names confuse vs the actual dma_map_* calls... Could you help to give the right function name? The new map function is to map bounce buffer in the trust/Isolation VM and these buffers are DMA memory. On 7/20/2021 9:54 PM, Christoph Hellwig wrote: >> - set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT); >> - memset(vaddr, 0, bytes); >> + mem->vstart = (void *)set_memory_decrypted_map((unsigned long)vaddr, bytes); > Please always pass kernel virtual addresses as pointers. > > And I think these APIs might need better names, e.g. > > arch_dma_map_decrypted and arch_dma_unmap_decrypted. > > Also these will need fallback versions for non-x86 architectures that > currently use memory encryption.