From: Jason Gunthorpe <jgg@nvidia.com>
To: Baolu Lu <baolu.lu@linux.intel.com>
Cc: Zhangfei Gao <zhangfei.gao@linaro.org>,
acpica-devel@lists.linux.dev, iommu@lists.linux.dev,
Joerg Roedel <joro@8bytes.org>, Kevin Tian <kevin.tian@intel.com>,
kvm@vger.kernel.org, Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Robert Moore <robert.moore@intel.com>,
Robin Murphy <robin.murphy@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Will Deacon <will@kernel.org>,
Alex Williamson <alex.williamson@redhat.com>,
Donald Dutile <ddutile@redhat.com>,
Eric Auger <eric.auger@redhat.com>,
Hanjun Guo <guohanjun@huawei.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Jerry Snitselaar <jsnitsel@redhat.com>,
Moritz Fischer <mdf@kernel.org>,
Michael Shavit <mshavit@google.com>,
Nicolin Chen <nicolinc@nvidia.com>,
patches@lists.linux.dev,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
Mostafa Saleh <smostafa@google.com>
Subject: Re: [PATCH v4 00/12] Initial support for SMMUv3 nested translation
Date: Tue, 18 Feb 2025 09:03:33 -0400 [thread overview]
Message-ID: <20250218130333.GA4099685@nvidia.com> (raw)
In-Reply-To: <58e7fbee-6688-4a49-8b7a-f0e81e6562db@linux.intel.com>
On Sat, Feb 15, 2025 at 05:53:13PM +0800, Baolu Lu wrote:
> On 2/14/25 20:41, Jason Gunthorpe wrote:
> > On Fri, Feb 14, 2025 at 01:39:52PM +0800, Baolu Lu wrote:
> >
> > > When the IOMMU is working in scalable mode, PASID and PRI are supported.
> > > ATS will always be enabled, even if the identity domain is attached to
> > > the device, because the PASID might use PRI, which depends on ATS
> > > functionality. This might not be the best choice, but it is the
> > > simplest and functional.
> > The arm driver keeps track of things and enables ATS when PASIDs are
> > present
>
> I am not aware of any VT-d hardware implementation that supports
> scalable mode but not PASID. If there were one, it would be worthwhile
> to add an optimization to avoid enabling ATS during probe if PASID is
> not supported.
I mean domains attached to PASIDs that need PRI/ATS/etc
> > Although, I'm wondering now, that check should be on the SVA paths as
> > well as the iommufd path..
>
> That appears to be a fix.
Does SVA have the same issue?
Jason
next prev parent reply other threads:[~2025-02-18 13:18 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-31 0:20 [PATCH v4 00/12] Initial support for SMMUv3 nested translation Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 01/12] vfio: Remove VFIO_TYPE1_NESTING_IOMMU Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 02/12] ACPICA: IORT: Update for revision E.f Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 03/12] ACPI/IORT: Support CANWBS memory access flag Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 04/12] iommu/arm-smmu-v3: Report IOMMU_CAP_ENFORCE_CACHE_COHERENCY for CANWBS Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 05/12] iommu/arm-smmu-v3: Support IOMMU_GET_HW_INFO via struct arm_smmu_hw_info Jason Gunthorpe
2024-11-04 11:47 ` Will Deacon
2024-11-04 12:41 ` Jason Gunthorpe
2024-11-06 16:37 ` Robin Murphy
2024-11-06 18:05 ` Jason Gunthorpe
2024-11-06 21:05 ` Robin Murphy
2024-11-06 21:53 ` Nicolin Chen
2024-11-07 2:35 ` Jason Gunthorpe
2024-11-07 15:51 ` Jason Gunthorpe
2024-11-08 14:53 ` Will Deacon
2024-11-08 15:42 ` Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 06/12] iommu/arm-smmu-v3: Implement IOMMU_HWPT_ALLOC_NEST_PARENT Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 07/12] iommu/arm-smmu-v3: Expose the arm_smmu_attach interface Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 08/12] iommu/arm-smmu-v3: Support IOMMU_VIOMMU_ALLOC Jason Gunthorpe
2024-11-29 14:38 ` Shameerali Kolothum Thodi
2024-11-29 15:06 ` Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 09/12] iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED Jason Gunthorpe
2024-10-31 6:21 ` Zhangfei Gao
2024-11-04 17:19 ` Jason Gunthorpe
2024-11-06 5:39 ` Zhangfei Gao
2024-10-31 0:20 ` [PATCH v4 10/12] iommu/arm-smmu-v3: Use S2FWB for NESTED domains Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 11/12] iommu/arm-smmu-v3: Allow ATS for IOMMU_DOMAIN_NESTED Jason Gunthorpe
2024-10-31 0:20 ` [PATCH v4 12/12] iommu/arm-smmu-v3: Support IOMMU_HWPT_INVALIDATE using a VIOMMU object Jason Gunthorpe
2024-10-31 0:53 ` [PATCH v4 00/12] Initial support for SMMUv3 nested translation Nicolin Chen
2024-11-01 12:18 ` Will Deacon
2024-11-01 13:25 ` Jason Gunthorpe
2024-11-05 16:48 ` Will Deacon
2024-11-05 17:03 ` Jason Gunthorpe
2024-11-08 14:56 ` Will Deacon
2024-11-12 18:29 ` Jason Gunthorpe
2024-11-13 1:01 ` Zhangfei Gao
2024-11-13 1:23 ` Jason Gunthorpe
2024-11-13 2:55 ` Baolu Lu
2024-11-13 6:28 ` Zhangfei Gao
2024-11-13 16:43 ` Jason Gunthorpe
2024-11-14 0:51 ` Baolu Lu
2024-11-15 17:55 ` Jason Gunthorpe
2025-01-22 19:26 ` Jason Gunthorpe
2025-02-05 3:45 ` Baolu Lu
2025-02-13 11:57 ` Baolu Lu
2025-02-13 18:43 ` Jason Gunthorpe
2025-02-14 5:39 ` Baolu Lu
2025-02-14 12:41 ` Jason Gunthorpe
2025-02-15 9:53 ` Baolu Lu
2025-02-18 13:03 ` Jason Gunthorpe [this message]
2025-02-19 2:09 ` Baolu Lu
2025-02-19 8:34 ` Tian, Kevin
2025-02-20 2:10 ` Baolu Lu
2025-02-20 6:51 ` Tian, Kevin
2025-02-20 11:49 ` Baolu Lu
2025-02-21 4:28 ` Tian, Kevin
2025-02-21 13:04 ` Jason Gunthorpe
2025-02-22 7:13 ` Baolu Lu
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