From: Jason Gunthorpe <jgg@ziepe.ca>
To: jacob.pan@linux.microsoft.com,
Easwar Hariharan <eahariha@linux.microsoft.com>
Cc: Vasant Hegde <vasant.hegde@amd.com>,
Baolu Lu <baolu.lu@linux.intel.com>,
iommu@lists.linux.dev, joro@8bytes.org, will@kernel.org,
robin.murphy@arm.com, suravee.suthikulpanit@amd.com,
yi.l.liu@intel.com, kevin.tian@intel.com
Subject: Re: [PATCH v2 3/8] iommu: Add new flag to explictly request PASID capable domain
Date: Wed, 2 Oct 2024 16:07:05 -0300 [thread overview]
Message-ID: <20241002190705.GM1369530@ziepe.ca> (raw)
In-Reply-To: <66fd98e3.170a0220.23d7ae.c2a9SMTPIN_ADDED_BROKEN@mx.google.com>
> Slightly off topic, in [1], you mentioned the following flow for
> iommu_group_alloc_default_domain()
> {
> ...
> if (req_type || iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY)
> { dom = iommu_group_alloc_identity_domain();
> if (req_type || !IS_ERR(dom))
> return dom;
> /*
> * if iommu_def_domain_type == IDENTITY fails then fall
> through
> * to PAGING
> */
> }
>
> If we were to have a vIOMMU that only supports "identity" and "sva"
> domains, there would be no need to fall back to PAGING.
That's illegal. If you support SVA the driver can and should support
PAGING. I don't want to see SVA being special.
There must always be a DMA API domain of some kind, if identity
doesn't work then paging must, otherwise the device is unusable.
Jason
next prev parent reply other threads:[~2024-10-02 19:07 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-11 10:19 [PATCH v2 0/8] iommu: Domain allocation enhancements Vasant Hegde
2024-09-11 10:19 ` [PATCH v2 1/8] iommu: Refactor __iommu_domain_alloc() Vasant Hegde
2024-09-12 1:50 ` Baolu Lu
2024-09-13 4:02 ` Jacob Pan
2024-09-26 10:17 ` Vasant Hegde
2024-09-30 17:55 ` Jacob Pan
2024-10-01 4:31 ` Vasant Hegde
2024-10-02 5:11 ` Jacob Pan
[not found] ` <66fae60d.170a0220.280357.3d11SMTPIN_ADDED_BROKEN@mx.google.com>
2024-10-02 14:19 ` Jason Gunthorpe
2024-10-02 16:16 ` Jacob Pan
2024-10-02 19:09 ` Jason Gunthorpe
2024-10-15 8:12 ` Tian, Kevin
2024-09-11 10:19 ` [PATCH v2 2/8] iommu: Introduce iommu_paging_domain_alloc_flags() Vasant Hegde
2024-09-12 4:04 ` Baolu Lu
2024-09-26 10:43 ` Vasant Hegde
2024-10-15 8:24 ` Tian, Kevin
2024-10-15 12:31 ` Jason Gunthorpe
2024-10-16 2:44 ` Tian, Kevin
2024-10-02 19:12 ` Jason Gunthorpe
2024-10-09 21:14 ` Jacob Pan
2024-10-16 10:14 ` Vasant Hegde
2024-09-11 10:19 ` [PATCH v2 3/8] iommu: Add new flag to explictly request PASID capable domain Vasant Hegde
2024-09-12 4:14 ` Baolu Lu
2024-09-26 10:29 ` Vasant Hegde
2024-09-26 11:01 ` Vasant Hegde
2024-10-02 14:23 ` Jason Gunthorpe
2024-10-02 19:02 ` Jacob Pan
[not found] ` <66fd98e3.170a0220.23d7ae.c2a9SMTPIN_ADDED_BROKEN@mx.google.com>
2024-10-02 19:07 ` Jason Gunthorpe [this message]
2024-10-03 16:00 ` Jacob Pan
2024-10-02 19:23 ` Jason Gunthorpe
2024-10-04 8:12 ` Vasant Hegde
2024-10-04 12:46 ` Jason Gunthorpe
2024-10-15 8:31 ` Tian, Kevin
2024-09-11 10:19 ` [PATCH v2 4/8] iommu/amd: Separate page table setup from domain allocation Vasant Hegde
2024-09-13 17:08 ` Jacob Pan
2024-10-02 19:24 ` Jason Gunthorpe
2024-09-11 10:19 ` [PATCH v2 5/8] iommu/amd: Pass page table type as param to pdom_setup_pgtable() Vasant Hegde
2024-09-13 21:39 ` Jacob Pan
2024-09-26 10:25 ` Vasant Hegde
2024-09-30 17:57 ` Jacob Pan
[not found] ` <66e4b125.170a0220.2fa213.1e2cSMTPIN_ADDED_BROKEN@mx.google.com>
2024-09-20 13:02 ` Jason Gunthorpe
2024-09-11 10:19 ` [PATCH v2 6/8] iommu/amd: Enhance domain_alloc_user() to allocate PASID capable domain Vasant Hegde
2024-10-02 19:31 ` Jason Gunthorpe
2024-10-04 8:18 ` Vasant Hegde
2024-10-04 12:48 ` Jason Gunthorpe
2024-10-04 14:32 ` Vasant Hegde
2024-10-15 8:41 ` Tian, Kevin
2024-10-15 12:40 ` Jason Gunthorpe
2024-10-16 2:48 ` Tian, Kevin
2024-10-16 15:28 ` Jason Gunthorpe
2024-10-17 6:11 ` Tian, Kevin
2024-10-17 11:03 ` Vasant Hegde
2024-09-11 10:19 ` [PATCH v2 7/8] iommu/amd: Add iommu_ops->domain_alloc_paging support Vasant Hegde
2024-10-02 19:33 ` Jason Gunthorpe
2024-10-04 11:55 ` Vasant Hegde
2024-10-04 12:56 ` Jason Gunthorpe
2024-10-04 14:30 ` Vasant Hegde
2024-10-04 15:31 ` Jason Gunthorpe
2024-10-08 10:08 ` Vasant Hegde
2024-09-11 10:19 ` [PATCH v2 8/8] iommu/amd: Implement global identity domain Vasant Hegde
2024-10-02 19:36 ` Jason Gunthorpe
2024-10-04 11:42 ` Vasant Hegde
2024-10-02 5:30 ` [PATCH v2 0/8] iommu: Domain allocation enhancements Vasant Hegde
2024-10-02 14:24 ` Jason Gunthorpe
2024-10-04 6:11 ` Vasant Hegde
2024-10-09 2:47 ` Baolu Lu
2024-10-09 9:53 ` Vasant Hegde
2024-10-09 12:15 ` Jason Gunthorpe
2024-10-10 6:40 ` Baolu Lu
2024-10-10 6:48 ` Baolu Lu
2024-10-10 11:38 ` Jason Gunthorpe
2024-10-10 14:06 ` Baolu Lu
2024-10-11 5:06 ` Tian, Kevin
2024-10-11 11:39 ` Jason Gunthorpe
2024-10-15 8:10 ` Tian, Kevin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20241002190705.GM1369530@ziepe.ca \
--to=jgg@ziepe.ca \
--cc=baolu.lu@linux.intel.com \
--cc=eahariha@linux.microsoft.com \
--cc=iommu@lists.linux.dev \
--cc=jacob.pan@linux.microsoft.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=robin.murphy@arm.com \
--cc=suravee.suthikulpanit@amd.com \
--cc=vasant.hegde@amd.com \
--cc=will@kernel.org \
--cc=yi.l.liu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.