From: "Tian, Kevin" <kevin.tian@intel.com> To: Jason Gunthorpe <jgg@nvidia.com>, Lu Baolu <baolu.lu@linux.intel.com> Cc: "Raj, Ashok" <ashok.raj@intel.com>, Will Deacon <will@kernel.org>, Jean-Philippe Brucker <jean-philippe@linaro.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Christoph Hellwig <hch@infradead.org>, "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>, "Pan, Jacob jun" <jacob.jun.pan@intel.com>, Robin Murphy <robin.murphy@arm.com> Subject: RE: [PATCH RFC v2 03/11] iommu/sva: Add iommu_domain type for SVA Date: Sat, 2 Apr 2022 08:43:16 +0000 [thread overview] Message-ID: <BN9PR11MB5276A39F481E2E31B0FCFEAE8CE39@BN9PR11MB5276.namprd11.prod.outlook.com> (raw) In-Reply-To: <20220330190201.GB2120790@nvidia.com> > From: Jason Gunthorpe <jgg@nvidia.com> > Sent: Thursday, March 31, 2022 3:02 AM > > On Tue, Mar 29, 2022 at 01:37:52PM +0800, Lu Baolu wrote: > > @@ -95,6 +101,7 @@ struct iommu_domain { > > void *handler_token; > > struct iommu_domain_geometry geometry; > > struct iommu_dma_cookie *iova_cookie; > > + struct iommu_sva_cookie *sva_cookie; > > Cookie is still the wrong word to use here > > > +struct iommu_sva_cookie { > > + struct mm_struct *mm; > > + ioasid_t pasid; > > + refcount_t users; > > Really surprised to see a refcount buried inside the iommu_domain.. > > This design seems inside out, the SVA struct should 'enclose' the domain, not > be a pointer inside it. > > struct iommu_sva_domain { > struct kref_t kref; > struct mm_struct *mm; > ioasid_t pasid; > > /* All the domains that are linked to this */ > struct xarray domain_list; > }; > > And then you could have a pointer to that inside the mm_struct instead > of just the naked pasid. > > > +static __maybe_unused struct iommu_domain * > > Why maybe unused? > > > +iommu_sva_get_domain(struct device *dev, struct mm_struct *mm) > > +{ > > + struct iommu_domain *domain; > > + ioasid_t pasid = mm->pasid; > > + > > + if (pasid == INVALID_IOASID) > > + return NULL; > > + > > + domain = xa_load(&sva_domain_array, pasid); > > + if (!domain) > > + return iommu_sva_alloc_domain(dev, mm); > > + iommu_sva_domain_get_user(domain); > > This assumes any domain is interchangeable with any device, which is > not the iommu model. We need a domain op to check if a device is > compatiable with the domain for vfio an iommufd, this should do the > same. This suggests that mm_struct needs to include the format information of the CPU page table so the format can be checked by the domain op? > > It means each mm can have a list of domains associated with it and a > new domain is auto-created if the device doesn't work with any of the > existing domains. > mm has only one page table and one format. If a device is incompatible with an existing domain wrapping that page table, how come creating another domain could make it compatible? Thanks Kevin _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: "Tian, Kevin" <kevin.tian@intel.com> To: Jason Gunthorpe <jgg@nvidia.com>, Lu Baolu <baolu.lu@linux.intel.com> Cc: Joerg Roedel <joro@8bytes.org>, Christoph Hellwig <hch@infradead.org>, "Raj, Ashok" <ashok.raj@intel.com>, Will Deacon <will@kernel.org>, "Robin Murphy" <robin.murphy@arm.com>, Jean-Philippe Brucker <jean-philippe@linaro.com>, Eric Auger <eric.auger@redhat.com>, "Liu, Yi L" <yi.l.liu@intel.com>, "Pan, Jacob jun" <jacob.jun.pan@intel.com>, "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: RE: [PATCH RFC v2 03/11] iommu/sva: Add iommu_domain type for SVA Date: Sat, 2 Apr 2022 08:43:16 +0000 [thread overview] Message-ID: <BN9PR11MB5276A39F481E2E31B0FCFEAE8CE39@BN9PR11MB5276.namprd11.prod.outlook.com> (raw) In-Reply-To: <20220330190201.GB2120790@nvidia.com> > From: Jason Gunthorpe <jgg@nvidia.com> > Sent: Thursday, March 31, 2022 3:02 AM > > On Tue, Mar 29, 2022 at 01:37:52PM +0800, Lu Baolu wrote: > > @@ -95,6 +101,7 @@ struct iommu_domain { > > void *handler_token; > > struct iommu_domain_geometry geometry; > > struct iommu_dma_cookie *iova_cookie; > > + struct iommu_sva_cookie *sva_cookie; > > Cookie is still the wrong word to use here > > > +struct iommu_sva_cookie { > > + struct mm_struct *mm; > > + ioasid_t pasid; > > + refcount_t users; > > Really surprised to see a refcount buried inside the iommu_domain.. > > This design seems inside out, the SVA struct should 'enclose' the domain, not > be a pointer inside it. > > struct iommu_sva_domain { > struct kref_t kref; > struct mm_struct *mm; > ioasid_t pasid; > > /* All the domains that are linked to this */ > struct xarray domain_list; > }; > > And then you could have a pointer to that inside the mm_struct instead > of just the naked pasid. > > > +static __maybe_unused struct iommu_domain * > > Why maybe unused? > > > +iommu_sva_get_domain(struct device *dev, struct mm_struct *mm) > > +{ > > + struct iommu_domain *domain; > > + ioasid_t pasid = mm->pasid; > > + > > + if (pasid == INVALID_IOASID) > > + return NULL; > > + > > + domain = xa_load(&sva_domain_array, pasid); > > + if (!domain) > > + return iommu_sva_alloc_domain(dev, mm); > > + iommu_sva_domain_get_user(domain); > > This assumes any domain is interchangeable with any device, which is > not the iommu model. We need a domain op to check if a device is > compatiable with the domain for vfio an iommufd, this should do the > same. This suggests that mm_struct needs to include the format information of the CPU page table so the format can be checked by the domain op? > > It means each mm can have a list of domains associated with it and a > new domain is auto-created if the device doesn't work with any of the > existing domains. > mm has only one page table and one format. If a device is incompatible with an existing domain wrapping that page table, how come creating another domain could make it compatible? Thanks Kevin
next prev parent reply other threads:[~2022-04-02 8:43 UTC|newest] Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-03-29 5:37 [PATCH RFC v2 00/11] iommu: SVA and IOPF refactoring Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 01/11] iommu: Add pasid_bits field in struct dev_iommu Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 21:00 ` Jacob Pan 2022-03-29 21:00 ` Jacob Pan 2022-03-30 4:30 ` Lu Baolu 2022-03-30 4:30 ` Lu Baolu 2022-03-30 7:05 ` Tian, Kevin 2022-03-30 7:05 ` Tian, Kevin 2022-03-30 11:58 ` Lu Baolu 2022-03-30 11:58 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 02/11] iommu: Add iommu_group_singleton_lockdown() Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 8:42 ` Tian, Kevin 2022-03-29 8:42 ` Tian, Kevin 2022-03-29 11:42 ` Jason Gunthorpe 2022-03-29 11:42 ` Jason Gunthorpe via iommu 2022-03-30 6:50 ` Tian, Kevin 2022-03-30 6:50 ` Tian, Kevin 2022-03-30 11:57 ` Lu Baolu 2022-03-30 11:57 ` Lu Baolu 2022-03-30 11:58 ` Jason Gunthorpe via iommu 2022-03-30 11:58 ` Jason Gunthorpe 2022-03-30 14:12 ` Tian, Kevin 2022-03-30 14:12 ` Tian, Kevin 2022-03-30 14:30 ` Jason Gunthorpe 2022-03-30 14:30 ` Jason Gunthorpe via iommu 2022-04-02 7:12 ` Tian, Kevin 2022-04-02 7:12 ` Tian, Kevin 2022-04-02 23:29 ` Jason Gunthorpe 2022-04-02 23:29 ` Jason Gunthorpe via iommu 2022-04-06 10:02 ` Lu Baolu 2022-04-06 10:02 ` Lu Baolu 2022-04-06 10:44 ` Tian, Kevin 2022-04-06 10:44 ` Tian, Kevin 2022-04-06 11:03 ` Lu Baolu 2022-04-06 11:03 ` Lu Baolu 2022-04-06 23:56 ` Tian, Kevin 2022-04-06 23:56 ` Tian, Kevin 2022-03-30 14:18 ` Tian, Kevin 2022-03-30 14:18 ` Tian, Kevin 2022-03-30 15:04 ` Alex Williamson 2022-03-30 15:04 ` Alex Williamson 2022-04-04 5:43 ` Lu Baolu 2022-04-04 5:43 ` Lu Baolu 2022-04-04 17:24 ` Jason Gunthorpe via iommu 2022-04-04 17:24 ` Jason Gunthorpe 2022-04-05 6:12 ` Lu Baolu 2022-04-05 6:12 ` Lu Baolu 2022-04-05 14:10 ` Jason Gunthorpe via iommu 2022-04-05 14:10 ` Jason Gunthorpe 2022-04-06 9:51 ` Lu Baolu 2022-04-06 9:51 ` Lu Baolu 2022-04-01 6:20 ` Yi Liu 2022-04-01 6:20 ` Yi Liu 2022-04-01 11:52 ` Jason Gunthorpe 2022-04-01 11:52 ` Jason Gunthorpe via iommu 2022-03-30 4:59 ` Lu Baolu 2022-03-30 4:59 ` Lu Baolu 2022-03-30 6:55 ` Tian, Kevin 2022-03-30 6:55 ` Tian, Kevin 2022-04-01 5:49 ` Yi Liu 2022-04-01 5:49 ` Yi Liu 2022-03-29 5:37 ` [PATCH RFC v2 03/11] iommu/sva: Add iommu_domain type for SVA Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 21:38 ` Jacob Pan 2022-03-29 21:38 ` Jacob Pan 2022-03-30 4:35 ` Lu Baolu 2022-03-30 4:35 ` Lu Baolu 2022-03-30 19:02 ` Jason Gunthorpe 2022-03-30 19:02 ` Jason Gunthorpe via iommu 2022-04-02 8:43 ` Tian, Kevin [this message] 2022-04-02 8:43 ` Tian, Kevin 2022-04-02 23:32 ` Jason Gunthorpe 2022-04-02 23:32 ` Jason Gunthorpe via iommu 2022-04-04 6:09 ` Lu Baolu 2022-04-04 6:09 ` Lu Baolu 2022-04-06 1:00 ` Tian, Kevin 2022-04-06 1:00 ` Tian, Kevin 2022-04-06 1:23 ` Jason Gunthorpe via iommu 2022-04-06 1:23 ` Jason Gunthorpe 2022-04-06 5:58 ` Tian, Kevin 2022-04-06 5:58 ` Tian, Kevin 2022-04-06 12:32 ` Robin Murphy 2022-04-06 12:32 ` Robin Murphy 2022-04-06 13:06 ` Jason Gunthorpe via iommu 2022-04-06 13:06 ` Jason Gunthorpe 2022-04-06 13:37 ` Robin Murphy 2022-04-06 13:37 ` Robin Murphy 2022-04-06 14:01 ` Jason Gunthorpe via iommu 2022-04-06 14:01 ` Jason Gunthorpe 2022-04-07 0:11 ` Tian, Kevin 2022-04-07 0:11 ` Tian, Kevin 2022-03-29 5:37 ` [PATCH RFC v2 04/11] iommu: Add attach/detach_dev_pasid domain ops Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-30 19:08 ` Jason Gunthorpe 2022-03-30 19:08 ` Jason Gunthorpe via iommu 2022-04-04 6:47 ` Lu Baolu 2022-04-04 6:47 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 05/11] iommu/vt-d: Remove SVM_FLAG_SUPERVISOR_MODE suport Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 06/11] iommu/vt-d: Add SVA domain support Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-30 19:09 ` Jason Gunthorpe 2022-03-30 19:09 ` Jason Gunthorpe via iommu 2022-04-04 6:52 ` Lu Baolu 2022-04-04 6:52 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 07/11] arm-smmu-v3/sva: " Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 08/11] iommu/sva: Use attach/detach_pasid_dev in SVA interfaces Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-31 20:59 ` Jacob Pan 2022-03-31 20:59 ` Jacob Pan 2022-03-31 22:26 ` Jason Gunthorpe 2022-03-31 22:26 ` Jason Gunthorpe via iommu 2022-04-04 5:55 ` Lu Baolu 2022-04-04 5:55 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 09/11] iommu: Remove SVA related callbacks from iommu ops Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 5:37 ` [PATCH RFC v2 10/11] iommu: Per-domain I/O page fault handling Lu Baolu 2022-03-29 5:37 ` Lu Baolu 2022-03-29 5:38 ` [PATCH RFC v2 11/11] iommu: Rename iommu-sva-lib.{c,h} Lu Baolu 2022-03-29 5:38 ` Lu Baolu
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