From: Jason Gunthorpe <jgg@ziepe.ca>
To: Baolu Lu <baolu.lu@linux.intel.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
"Zhang, Tina" <tina.zhang@intel.com>,
Michael Shavit <mshavit@google.com>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/5] iommu: Call helper function to get assigned pasid value
Date: Thu, 10 Aug 2023 13:30:46 -0300 [thread overview]
Message-ID: <ZNUQtluLWek3PnEn@ziepe.ca> (raw)
In-Reply-To: <84494c88-66eb-a731-fbf0-4a83fb9102f1@linux.intel.com>
On Thu, Aug 10, 2023 at 09:37:09AM +0800, Baolu Lu wrote:
> > The core could put the mm_notifier in a common iommu_domain_sva struct
> > and it could stick in the driver's invalidate ops, that would be a
> > nice simplification (and discourage drivers from doing the crazy
> > things they are currently doing)
>
> Yes. So the iommu driver can retrieve the sva domain from struct
> mmu_notifier. The callback implementation will still be domain centric.
> Hence, there will be no need to use mm.
Remember the driver always needs the mm as it has to extract the page
table address from it.
At the end of the day installing the notifier is a single call in the
SVA alloc op, so it may not be worth optimizing beyond allowing
drivers to do it in their SVA alloc op.
Jason
next prev parent reply other threads:[~2023-08-10 16:30 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-08 7:49 [PATCH 0/5] Share sva domains with all devices bound to a mm Tina Zhang
2023-08-08 7:49 ` [PATCH 1/5] iommu: Add mm_get_pasid() helper function Tina Zhang
2023-08-08 15:02 ` Jason Gunthorpe
2023-08-09 0:31 ` Baolu Lu
2023-08-09 9:47 ` Tian, Kevin
2023-08-09 12:31 ` Jason Gunthorpe
2023-08-08 7:49 ` [PATCH 2/5] iommu: Call helper function to get assigned pasid value Tina Zhang
2023-08-09 0:21 ` Baolu Lu
2023-08-09 9:49 ` Tian, Kevin
2023-08-09 10:58 ` Baolu Lu
2023-08-09 14:48 ` Jason Gunthorpe
2023-08-10 1:37 ` Baolu Lu
2023-08-10 16:30 ` Jason Gunthorpe [this message]
2023-08-09 12:35 ` Jason Gunthorpe
2023-08-10 7:52 ` Tian, Kevin
2023-08-10 16:36 ` Jason Gunthorpe
2023-08-11 3:18 ` Tian, Kevin
2023-08-08 7:49 ` [PATCH 3/5] mm: Add structure to keep sva information Tina Zhang
2023-08-08 7:49 ` [PATCH 4/5] iommu: Support mm PASID 1:n with sva domains Tina Zhang
2023-08-08 15:12 ` Jason Gunthorpe
2023-08-08 15:19 ` Jason Gunthorpe
2023-08-10 2:14 ` Tina Zhang
2023-08-08 7:49 ` [PATCH 5/5] mm: Deprecate pasid field Tina Zhang
2023-08-09 0:18 ` [PATCH 0/5] Share sva domains with all devices bound to a mm Baolu Lu
2023-08-09 9:44 ` Tian, Kevin
2023-08-09 10:51 ` Baolu Lu
2023-08-11 1:06 ` Tina Zhang
2023-08-09 14:46 ` Jason Gunthorpe
2023-08-10 1:23 ` Baolu Lu
2023-08-10 7:44 ` Tian, Kevin
2023-08-09 9:41 ` Tian, Kevin
2023-08-10 1:31 ` Tina Zhang
2023-08-10 7:49 ` Tian, Kevin
2023-08-10 16:27 ` Jason Gunthorpe
2023-08-11 1:12 ` Tina Zhang
2023-08-11 1:07 ` Tina Zhang
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