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Thu, 16 Sep 2021 18:29:44 +0000 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Thu, 16 Sep 2021 18:29:42 +0000 Received: from Asurada-Nvidia (172.20.187.6) by mail.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1497.18 via Frontend Transport; Thu, 16 Sep 2021 18:29:42 +0000 Date: Thu, 16 Sep 2021 11:21:56 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: Jason Gunthorpe , Alex Williamson , "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "thierry.reding@gmail.com" , "will@kernel.org" , "jean-philippe@linaro.org" , "corbet@lwn.net" , "linux-tegra@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "cohuck@redhat.com" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "robin.murphy@arm.com" Subject: Re: [RFC][PATCH v2 00/13] iommu/arm-smmu-v3: Add NVIDIA implementation Message-ID: <20210916182155.GA29656@Asurada-Nvidia> References: <20210831025923.15812-1-nicolinc@nvidia.com> <20210831101549.237151fa.alex.williamson@redhat.com> <20210902144524.GU1721383@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 58d49d23-25c3-43d5-21e5-08d9793ff4d7 X-MS-TrafficTypeDiagnostic: BYAPR12MB4694: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Kevin, On Thu, Sep 02, 2021 at 10:27:06PM +0000, Tian, Kevin wrote: > > Indeed, this looks like a flavour of the accelerated invalidation > > stuff we've talked about already. > > > > I would see it probably exposed as some HW specific IOCTL on the iommu > > fd to get access to the accelerated invalidation for IOASID's in the > > FD. > > > > Indeed, this seems like a further example of why /dev/iommu is looking > > like a good idea as this RFC is very complicated to do something > > fairly simple. > > > > Where are thing on the /dev/iommu work these days? > > We are actively working on the basic skeleton. Our original plan is to send > out the 1st draft before LPC, with support of vfio type1 semantics and > and pci dev only (single-device group). But later we realized that adding > multi-devices group support is also necessary even in the 1st draft to avoid > some dirty hacks and build the complete picture. This will add some time > though. If things go well, we'll still try hit the original plan. If not, it will be > soon after LPC. As I also want to take a look at your work for this implementation, would you please CC me when you send out your patches? Thank you! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel