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([2404:f801:9000:18:efec::4b1]) by smtp.gmail.com with ESMTPSA id s7sm418969pfk.12.2021.07.29.21.10.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 Jul 2021 21:11:10 -0700 (PDT) Subject: Re: [PATCH 10/13] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM To: Konrad Rzeszutek Wilk 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, 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, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, ardb@kernel.org, Tianyu.Lan@microsoft.com, rientjes@google.com, martin.b.radev@gmail.com, akpm@linux-foundation.org, rppt@kernel.org, kirill.shutemov@linux.intel.com, aneesh.kumar@linux.ibm.com, krish.sadhukhan@oracle.com, saravanand@fb.com, xen-devel@lists.xenproject.org, pgonda@google.com, david@redhat.com, keescook@chromium.org, hannes@cmpxchg.org, sfr@canb.auug.org.au, 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, anparri@microsoft.com References: <20210728145232.285861-1-ltykernel@gmail.com> <20210728145232.285861-11-ltykernel@gmail.com> From: Tianyu Lan Message-ID: <7afbbc7f-8f02-ca6c-0c8c-bbf01fae70ea@gmail.com> Date: Fri, 30 Jul 2021 12:10:54 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi Konrad: Thanks for your review. On 7/30/2021 12:29 AM, Konrad Rzeszutek Wilk wrote: >> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c >> index 1fa81c096c1d..6866e5784b53 100644 >> --- a/kernel/dma/swiotlb.c >> +++ b/kernel/dma/swiotlb.c >> @@ -194,8 +194,13 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start, >> mem->slots[i].alloc_size = 0; >> } >> >> - set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT); >> - memset(vaddr, 0, bytes); >> + mem->vaddr = dma_map_decrypted(vaddr, bytes); >> + if (!mem->vaddr) { >> + pr_err("Failed to decrypt memory.\n"); > I am wondering if it would be worth returning an error code in this > function instead of just printing an error? Yes, this is good idea and will update in the next version. > > For this patch I think it is Ok, but perhaps going forward this would be > better done as I am thinking - is there some global guest->hyperv > reporting mechanism so that if this fails - it ends up being bubbled up > to the HyperV console-ish? Hyper-V has such panic page report mechanism. Guest can pass one page log to host during crash.