From: Yi Liu <yi.l.liu@intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Baolu Lu <baolu.lu@linux.intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"nicolinc@nvidia.com" <nicolinc@nvidia.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"chao.p.peng@linux.intel.com" <chao.p.peng@linux.intel.com>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"Duan, Zhenzhong" <zhenzhong.duan@intel.com>,
"Pan, Jacob jun" <jacob.jun.pan@intel.com>
Subject: Re: [PATCH v2 12/12] iommu/vt-d: Add set_dev_pasid callback for nested domain
Date: Wed, 8 May 2024 14:10:05 +0800 [thread overview]
Message-ID: <07e0547d-1ece-4848-8e59-393013b75da8@intel.com> (raw)
In-Reply-To: <20240507151847.GQ3341011@nvidia.com>
On 2024/5/7 23:18, Jason Gunthorpe wrote:
> On Tue, May 07, 2024 at 10:28:34AM +0800, Yi Liu wrote:
>>>> We still need something to do before we can safely remove this check.
>>>> All the domain allocation interfaces should eventually have the device
>>>> pointer as the input, and all domain attributions could be initialized
>>>> during domain allocation. In the attach paths, it should return -EINVAL
>>>> directly if the domain is not compatible with the iommu for the device.
>>>
>>> Yes, and this is already true for PASID.
>>
>> I'm not quite get why it is already true for PASID. I think Baolu's remark
>> is general to domains attached to either RID or PASID.
>>
>>> I feel we could reasonably insist that domanis used with PASID are
>>> allocated with a non-NULL dev.
>>
>> Any special reason for this disclaim?
>
> If it makes the driver easier, why not?
yep.
> PASID is special since PASID is barely used, we could insist that
> new PASID users also use the new domian_alloc API.
Ok. I have one doubt on how to make it in iommufd core. Shall the iommufd
core call ops->domain_alloc_paging() directly or still call
ops->domain_alloc_user() while ops->domain_alloc_user() flows into the
paging domain allocation with non-null dev?
>
>> I agree implementing alloc_domain_paging() is the final solution to avoid
>> such dynamic modifications to domain's caps. If it's really needed for
>> PASID series now, I can add it in next version. :)
>
> Well, if it is needed. If you can do this some other way that is
> reasonable then sure
At first, I'd like to keep this agaw check here and remove it after
implementing the ops->domain_alloc_paging() and retire domain_alloc op
in intel iommu driver side. I have such thoughts as the RID and PASID
attach path have the same concern w.r.t. agaw and other caps :)
--
Regards,
Yi Liu
next prev parent reply other threads:[~2024-05-08 6:06 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 8:15 [PATCH v2 00/12] iommufd support pasid attach/replace Yi Liu
2024-04-12 8:15 ` [PATCH v2 01/12] iommu: Pass old domain to set_dev_pasid op Yi Liu
2024-04-15 5:32 ` Baolu Lu
2024-04-15 11:54 ` Jason Gunthorpe
2024-04-16 2:07 ` Baolu Lu
2024-04-16 17:47 ` Jason Gunthorpe
2024-04-12 8:15 ` [PATCH v2 02/12] iommu: Introduce a replace API for device pasid Yi Liu
2024-04-16 3:01 ` Duan, Zhenzhong
2024-04-16 9:18 ` Yi Liu
2024-04-17 8:44 ` Tian, Kevin
2024-04-17 12:17 ` Jason Gunthorpe
2024-04-18 0:08 ` Tian, Kevin
2024-04-29 13:55 ` Jason Gunthorpe
2024-04-30 5:00 ` Yi Liu
2024-04-30 12:26 ` Jason Gunthorpe
2024-04-12 8:15 ` [PATCH v2 03/12] iommufd: replace attach_fn with a structure Yi Liu
2024-04-12 8:15 ` [PATCH v2 04/12] iommufd: Support attach/replace hwpt per pasid Yi Liu
2024-04-29 13:56 ` Jason Gunthorpe
2024-04-12 8:15 ` [PATCH v2 05/12] iommu: Allow iommu driver to populate the max_pasids Yi Liu
2024-04-15 5:41 ` Baolu Lu
2024-04-17 8:49 ` Tian, Kevin
2024-04-20 5:45 ` Yi Liu
2024-04-22 11:52 ` Jason Gunthorpe
2024-04-12 8:15 ` [PATCH v2 06/12] iommufd/selftest: Add set_dev_pasid and remove_dev_pasid in mock iommu Yi Liu
2024-04-12 8:15 ` [PATCH v2 07/12] iommufd/selftest: Add a helper to get test device Yi Liu
2024-04-12 8:15 ` [PATCH v2 08/12] iommufd/selftest: Add test ops to test pasid attach/detach Yi Liu
2024-04-12 8:15 ` [PATCH v2 09/12] iommufd/selftest: Add coverage for iommufd " Yi Liu
2024-04-12 8:15 ` [PATCH v2 10/12] iommu/vt-d: Return if no dev_pasid is found in domain Yi Liu
2024-04-15 6:04 ` Baolu Lu
2024-04-16 9:21 ` Yi Liu
2024-04-17 2:30 ` Baolu Lu
2024-04-17 3:48 ` Yi Liu
2024-04-17 9:03 ` Tian, Kevin
2024-04-17 9:36 ` Yi Liu
2024-04-12 8:15 ` [PATCH v2 11/12] iommu/vt-d: Make intel_iommu_set_dev_pasid() to handle domain replacement Yi Liu
2024-04-17 9:19 ` Tian, Kevin
2024-04-17 9:35 ` Yi Liu
2024-04-17 12:19 ` Jason Gunthorpe
2024-04-12 8:15 ` [PATCH v2 12/12] iommu/vt-d: Add set_dev_pasid callback for nested domain Yi Liu
2024-04-17 9:25 ` Tian, Kevin
2024-04-30 9:19 ` Yi Liu
2024-05-06 7:42 ` Baolu Lu
2024-05-06 13:36 ` Jason Gunthorpe
2024-05-07 2:28 ` Yi Liu
2024-05-07 15:18 ` Jason Gunthorpe
2024-05-08 6:10 ` Yi Liu [this message]
2024-05-08 12:25 ` Jason Gunthorpe
2024-05-08 13:26 ` Yi Liu
2024-05-08 14:11 ` Jason Gunthorpe
2024-05-09 14:22 ` Liu, Yi L
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