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Fri, 12 Feb 2021 10:18:08 +0000 Subject: Re: [PATCH v7 02/16] iommu/smmu: Report empty domain nesting info To: Auger Eric , "Liu, Yi L" Cc: Jean-Philippe Brucker , "Tian, Kevin" , "alex.williamson@redhat.com" , "Raj, Ashok" , "kvm@vger.kernel.org" , "stefanha@gmail.com" , "jasowang@redhat.com" , "iommu@lists.linux-foundation.org" , "Tian, Jun J" , "Sun, Yi Y" , Robin Murphy , Will Deacon , "Wu, Hao" References: <1599734733-6431-1-git-send-email-yi.l.liu@intel.com> <1599734733-6431-3-git-send-email-yi.l.liu@intel.com> <6bcd5229-9cd3-a78c-ccb2-be92f2add373@redhat.com> <9b6d409b-266b-230a-800a-24b8e6b5cd09@redhat.com> From: Vivek Kumar Gautam Message-ID: <306e7dd2-9eb2-0ca3-6a93-7c9aa0821ce9@arm.com> Date: Fri, 12 Feb 2021 15:48:00 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <9b6d409b-266b-230a-800a-24b8e6b5cd09@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Originating-IP: [217.140.105.56] X-ClientProxiedBy: PN1PR0101CA0015.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c00:e::25) To AM0PR08MB3268.eurprd08.prod.outlook.com (2603:10a6:208:65::26) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.162.16.71] (217.140.105.56) by PN1PR0101CA0015.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c00:e::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3846.27 via Frontend Transport; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2021 10:18:16.7889 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f614fec8-b042-4e0a-771b-08d8cf3f8377 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM5EUR03FT006.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB4063 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi Eric, On 2/12/21 3:27 PM, Auger Eric wrote: > Hi Vivek, Yi, > > On 2/12/21 8:14 AM, Vivek Gautam wrote: >> Hi Yi, >> >> >> On Sat, Jan 23, 2021 at 2:29 PM Liu, Yi L wrote: >>> >>> Hi Eric, >>> >>>> From: Auger Eric >>>> Sent: Tuesday, January 19, 2021 6:03 PM >>>> >>>> Hi Yi, Vivek, >>>> >>> [...] >>>>> I see. I think there needs a change in the code there. Should also ex= pect >>>>> a nesting_info returned instead of an int anymore. @Eric, how about y= our >>>>> opinion? >>>>> >>>>> domain =3D iommu_get_domain_for_dev(&vdev->pdev->dev); >>>>> ret =3D iommu_domain_get_attr(domain, DOMAIN_ATTR_NESTING, >>>> &info); >>>>> if (ret || !(info.features & IOMMU_NESTING_FEAT_PAGE_RESP)) { >>>>> /* >>>>> * No need go futher as no page request service support. >>>>> */ >>>>> return 0; >>>>> } >>>> Sure I think it is "just" a matter of synchro between the 2 series. Yi= , >>> >>> exactly. >>> >>>> do you have plans to respin part of >>>> [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs >>>> or would you allow me to embed this patch in my series. >>> >>> My v7 hasn=E2=80=99t touch the prq change yet. So I think it's better f= or you to >>> embed it to your series. ^_^>> >> >> Can you please let me know if you have an updated series of these >> patches? It will help me to work with virtio-iommu/arm side changes. > > As per the previous discussion, I plan to take those 2 patches in my > SMMUv3 nested stage series: > > [PATCH v7 01/16] iommu: Report domain nesting info > [PATCH v7 02/16] iommu/smmu: Report empty domain nesting info > > we need to upgrade both since we do not want to report an empty nesting > info anymore, for arm. Absolutely. Let me send the couple of patches that I have been using, that add arm configuration. Best regards Vivek > > Thanks > > Eric >> >> Thanks & regards >> Vivek >> > IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. If you are not the intended recipient, p= lease notify the sender immediately and do not disclose the contents to any= other person, use it for any purpose, or store or copy the information in = any medium. Thank you.