From: Jason Gunthorpe <jgg@ziepe.ca>
To: Yi Liu <yi.l.liu@intel.com>
Cc: Vasant Hegde <vasant.hegde@amd.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
Robin Murphy <robin.murphy@arm.com>,
"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
"joro@8bytes.org" <joro@8bytes.org>,
"will@kernel.org" <will@kernel.org>,
"suravee.suthikulpanit@amd.com" <suravee.suthikulpanit@amd.com>
Subject: Re: [PATCH] iommu/amd: Add Secure ATS support
Date: Tue, 4 Mar 2025 10:20:30 -0400 [thread overview]
Message-ID: <20250304142030.GA5011@ziepe.ca> (raw)
In-Reply-To: <2c9ef073-fee5-43c6-8932-a8cae677970e@intel.com>
On Tue, Mar 04, 2025 at 02:50:19PM +0800, Yi Liu wrote:
> > ARM enables ATS when a PAGING translation is set on the RID or any
> > PASID is used. Otherwise it is off, eg for RID = IDENTITY
> >
> > This seems like a reasonable thing to do to me..
>
> will it affect Baolu's above refactoring [1]? :(
I think no, but when we get some conclusion how ATS should work I'd
expect all IOMMU drivers to align
> > never
> > always
> > paging-only
>
> this can be considered policy to the existing ATS. curious, why paging
> domain is special here?
Using ATS with an IDENTITY translation is not a performance win, so
you'd probably want to turn it off in that case.
Jason
next prev parent reply other threads:[~2025-03-04 14:20 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-25 10:58 [PATCH] iommu/amd: Add Secure ATS support Vasant Hegde
2025-02-25 12:30 ` Yi Liu
2025-02-25 13:18 ` Robin Murphy
2025-02-25 13:57 ` Yi Liu
2025-02-25 14:55 ` Jason Gunthorpe
2025-02-26 1:09 ` Yi Liu
2025-02-26 1:13 ` Jason Gunthorpe
2025-02-26 1:27 ` Yi Liu
2025-02-26 2:52 ` Tian, Kevin
2025-02-26 1:12 ` Tian, Kevin
2025-02-26 1:17 ` Jason Gunthorpe
2025-02-26 2:50 ` Tian, Kevin
2025-02-26 12:57 ` Jason Gunthorpe
2025-02-26 7:05 ` Tian, Kevin
2025-02-26 12:58 ` Jason Gunthorpe
2025-02-27 15:27 ` Vasant Hegde
2025-02-28 6:32 ` Tian, Kevin
2025-02-28 7:43 ` Yi Liu
2025-02-28 8:30 ` Vasant Hegde
2025-02-28 8:47 ` Yi Liu
2025-02-28 8:47 ` Vasant Hegde
2025-03-02 8:10 ` Yi Liu
2025-03-03 3:00 ` Tian, Kevin
2025-03-04 6:58 ` Yi Liu
2025-03-03 11:42 ` Vasant Hegde
2025-03-05 3:24 ` Tian, Kevin
2025-03-10 17:07 ` Vasant Hegde
2025-03-12 7:15 ` Tian, Kevin
2025-03-17 8:56 ` Vasant Hegde
2025-04-07 5:28 ` Tian, Kevin
2025-03-03 18:38 ` Jason Gunthorpe
2025-03-04 2:16 ` Baolu Lu
2025-03-04 14:18 ` Jason Gunthorpe
2025-03-05 2:45 ` Baolu Lu
2025-03-05 2:46 ` Tian, Kevin
2025-03-04 6:50 ` Yi Liu
2025-03-04 10:46 ` Vasant Hegde
2025-03-04 14:20 ` Jason Gunthorpe [this message]
2025-03-05 2:50 ` Tian, Kevin
2025-03-05 17:22 ` Jason Gunthorpe
2025-03-06 2:41 ` Tian, Kevin
2025-03-14 12:54 ` Yi Liu
2025-03-04 10:15 ` Vasant Hegde
2025-03-04 14:24 ` Jason Gunthorpe
2025-03-10 16:35 ` Vasant Hegde
2025-03-14 12:09 ` Yi Liu
2025-03-19 19:52 ` Jason Gunthorpe
2025-03-14 12:22 ` Yi Liu
2025-02-28 8:26 ` Vasant Hegde
2025-02-28 14:56 ` Jason Gunthorpe
2025-03-03 2:55 ` Tian, Kevin
2025-03-10 14:13 ` Vasant Hegde
2025-03-12 6:55 ` Tian, Kevin
2025-03-03 11:56 ` Vasant Hegde
2025-02-26 4:47 ` Vasant Hegde
2025-02-26 7:10 ` Tian, Kevin
2025-02-26 13:01 ` Jason Gunthorpe
2025-02-26 22:42 ` Jerry Snitselaar
2025-02-27 16:04 ` Vasant Hegde
2025-02-28 0:04 ` Jason Gunthorpe
2025-02-28 6:18 ` Tian, Kevin
2025-02-28 1:47 ` Baolu Lu
2025-02-28 6:15 ` Tian, Kevin
2025-02-28 8:53 ` Vasant Hegde
2025-02-28 14:53 ` Jason Gunthorpe
2025-03-03 2:43 ` Tian, Kevin
2025-02-28 8:38 ` Vasant Hegde
2025-02-26 4:33 ` Vasant Hegde
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