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Tue, 17 May 2022 08:55:51 +0000 Received: from PH0PR11MB5658.namprd11.prod.outlook.com ([fe80::21cf:c26f:8d40:6b5f]) by PH0PR11MB5658.namprd11.prod.outlook.com ([fe80::21cf:c26f:8d40:6b5f%5]) with mapi id 15.20.5250.018; Tue, 17 May 2022 08:55:51 +0000 Message-ID: Date: Tue, 17 May 2022 16:55:32 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Thunderbird/91.7.0 Subject: Re: [RFC 00/18] vfio: Adopt iommufd Content-Language: en-US To: "zhangfei.gao@foxmail.com" , Jason Gunthorpe , Zhangfei Gao CC: , Alex Williamson , Shameerali Kolothum Thodi , "cohuck@redhat.com" , "qemu-devel@nongnu.org" , "david@gibson.dropbear.id.au" , "thuth@redhat.com" , "farman@linux.ibm.com" , "mjrosato@linux.ibm.com" , "akrowiak@linux.ibm.com" , "pasic@linux.ibm.com" , "jjherne@linux.ibm.com" , "jasowang@redhat.com" , "kvm@vger.kernel.org" , "nicolinc@nvidia.com" , "eric.auger.pro@gmail.com" , "kevin.tian@intel.com" , "chao.p.peng@intel.com" , "yi.y.sun@intel.com" , "peterx@redhat.com" References: <20220414104710.28534-1-yi.l.liu@intel.com> <4f920d463ebf414caa96419b625632d5@huawei.com> <4ac4956cfe344326a805966535c1dc43@huawei.com> <20220426103507.5693a0ca.alex.williamson@redhat.com> <66f4af24-b76e-9f9a-a86d-565c0453053d@linaro.org> <0d9bd05e-d82b-e390-5763-52995bfb0b16@intel.com> <720d56c8-da84-5e4d-f1f8-0e1878473b93@redhat.com> <29475423-33ad-bdd2-2d6a-dcd484d257a7@linaro.org> <20220510124554.GY49344@nvidia.com> <637b3992-45d9-f472-b160-208849d3d27a@intel.com> From: Yi Liu In-Reply-To: Content-Type: text/plain; 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envelope-from=yi.l.liu@intel.com; helo=mga02.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Zhangfei, On 2022/5/12 17:01, zhangfei.gao@foxmail.com wrote: > > Hi, Yi > > On 2022/5/11 下午10:17, zhangfei.gao@foxmail.com wrote: >> >> >> On 2022/5/10 下午10:08, Yi Liu wrote: >>> On 2022/5/10 20:45, Jason Gunthorpe wrote: >>>> On Tue, May 10, 2022 at 08:35:00PM +0800, Zhangfei Gao wrote: >>>>> Thanks Yi and Eric, >>>>> Then will wait for the updated iommufd kernel for the PCI MMIO region. >>>>> >>>>> Another question, >>>>> How to get the iommu_domain in the ioctl. >>>> >>>> The ID of the iommu_domain (called the hwpt) it should be returned by >>>> the vfio attach ioctl. >>> >>> yes, hwpt_id is returned by the vfio attach ioctl and recorded in >>> qemu. You can query page table related capabilities with this id. >>> >>> https://lore.kernel.org/kvm/20220414104710.28534-16-yi.l.liu@intel.com/ >>> >> Thanks Yi, >> >> Do we use iommufd_hw_pagetable_from_id in kernel? >> >> The qemu send hwpt_id via ioctl. >> Currently VFIOIOMMUFDContainer has hwpt_list, >> Which member is good to save hwpt_id, IOMMUTLBEntry? > > Can VFIOIOMMUFDContainer  have multi hwpt? yes, it is possible > Since VFIOIOMMUFDContainer has hwpt_list now. > If so, how to get specific hwpt from map/unmap_notify in hw/vfio/as.c, > where no vbasedev can be used for compare. > > I am testing with a workaround, adding VFIOIOASHwpt *hwpt in > VFIOIOMMUFDContainer. > And save hwpt when vfio_device_attach_container. > >> >> In kernel ioctl: iommufd_vfio_ioctl >> @dev: Device to get an iommu_domain for >> iommufd_hw_pagetable_from_id(struct iommufd_ctx *ictx, u32 pt_id, struct >> device *dev) >> But iommufd_vfio_ioctl seems no para dev? > > We can set dev=Null since IOMMUFD_OBJ_HW_PAGETABLE does not need dev. > iommufd_hw_pagetable_from_id(ictx, hwpt_id, NULL) this is not good. dev is passed in to this function to allocate domain and also check sw_msi things. If you pass in a NULL, it may even unable to get a domain for the hwpt. It won't work I guess. > Thanks >> > -- Regards, Yi Liu