From: Baolu Lu <baolu.lu@linux.intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: baolu.lu@linux.intel.com, Yi Liu <yi.l.liu@intel.com>,
joro@8bytes.org, kevin.tian@intel.com,
alex.williamson@redhat.com, robin.murphy@arm.com,
eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org,
chao.p.peng@linux.intel.com, iommu@lists.linux.dev,
zhenzhong.duan@intel.com, jacob.jun.pan@intel.com
Subject: Re: [PATCH v2 01/12] iommu: Pass old domain to set_dev_pasid op
Date: Tue, 16 Apr 2024 10:07:49 +0800 [thread overview]
Message-ID: <4f570287-cd11-4c89-9dd2-9bb106e343c1@linux.intel.com> (raw)
In-Reply-To: <20240415115442.GA3637727@nvidia.com>
On 4/15/24 7:54 PM, Jason Gunthorpe wrote:
> On Mon, Apr 15, 2024 at 01:32:03PM +0800, Baolu Lu wrote:
>> On 4/12/24 4:15 PM, Yi Liu wrote:
>>> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
>>> index 40dd439307e8..1e5e9249c93f 100644
>>> --- a/include/linux/iommu.h
>>> +++ b/include/linux/iommu.h
>>> @@ -631,7 +631,7 @@ struct iommu_ops {
>>> struct iommu_domain_ops {
>>> int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
>>> int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
>>> - ioasid_t pasid);
>>> + ioasid_t pasid, struct iommu_domain *old);
>> Is it possible to add another op to replace a domain for pasid? For
>> example,
>>
>> int (*replace_dev_pasid)(domain, dev, pasid, old_domain)
> We haven't needed that in the normal case, what would motivate it
> here?
My understanding of the difference between set_dev_pasid and
replace_dev_pasid is that the former assumes that there is no domain
attached to the pasid yet, so it sets the passed domain to it. For the
latter, it simply replaces the existing domain with a new one.
The set_dev_pasid doesn't need an old domain because it's assumed that
the existing domain is NULL. The replace_dev_pasid could have an
existing domain as its input.
Replace also implies an atomic switch between different domains. This
makes it subtly different from a set operation.
Best regards,
baolu
next prev parent reply other threads:[~2024-04-16 2:09 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 [this message]
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
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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