From: Jason Gunthorpe <jgg@ziepe.ca>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
linux-coco@lists.linux.dev, kvmarm@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Alexey Kardashevskiy <aik@amd.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Dan Williams <dan.j.williams@intel.com>,
Joerg Roedel <joro@8bytes.org>,
Jonathan Cameron <jic23@kernel.org>,
Marc Zyngier <maz@kernel.org>,
Pranjal Shrivastava <praan@google.com>,
Robin Murphy <robin.murphy@arm.com>,
Samuel Ortiz <sameo@rivosinc.com>,
Steven Price <steven.price@arm.com>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
Will Deacon <will@kernel.org>,
Xu Yilun <yilun.xu@linux.intel.com>
Subject: Re: [RFC PATCH v4 03/16] iommu/arm-smmu-v3: Add initial pSMMU realm viommu plumbing
Date: Tue, 1 Sep 2026 22:51:37 -0300 [thread overview]
Message-ID: <20260902015137.GA2890729@ziepe.ca> (raw)
In-Reply-To: <apcitkpASOREamQs@nvidia.com>
On Tue, Sep 01, 2026 at 12:08:38PM -0700, Nicolin Chen wrote:
> The viommu object here is an empty vehicle that almost has no use
> but to allow another vehicle (vdevice) on top to forward vBDF. It
> makes VMM code a bit awkward: there is no iommu instance, so VMM
> doesn't enable iommu driver, then there is no good place to alloc
> the viomu object for VIOMMU_TYPE_ARM_REALM_SMMUV3.
It would have to allocate singletons viommu for each psmmu as part of
setting up the vdevices.
Somehow I'd rather the vmm deal with that then invent a whole new set
of uapis and flows..
At best maybe we can invent a kernel side helper to create the
singletons like the auto domains, but IDK if it is really so hard for
the VMM (especially compared with how hard everything else is in CC)
Jason
next prev parent reply other threads:[~2026-09-02 1:51 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 8:53 [RFC PATCH v4 00/16] coco/TSM: Implement host-side support for Arm CCA TDISP setup Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 01/16] iommu/arm-smmu-v3: Discover RME support and realm IRQ topology Aneesh Kumar K.V (Arm)
2026-08-29 18:22 ` Nicolin Chen
2026-09-01 8:46 ` Aneesh Kumar K.V
2026-09-01 14:32 ` Jason Gunthorpe
2026-04-27 8:53 ` [RFC PATCH v4 02/16] iommu/arm-smmu-v3: Save the programmed MSI message in msi_desc Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 03/16] iommu/arm-smmu-v3: Add initial pSMMU realm viommu plumbing Aneesh Kumar K.V (Arm)
2026-08-29 20:00 ` Nicolin Chen
2026-09-01 9:17 ` Aneesh Kumar K.V
2026-09-01 10:06 ` Aneesh Kumar K.V
2026-09-01 14:34 ` Jason Gunthorpe
2026-09-01 17:13 ` Nicolin Chen
2026-09-01 17:18 ` Nicolin Chen
2026-09-01 17:45 ` Jason Gunthorpe
2026-09-01 17:42 ` Jason Gunthorpe
2026-09-01 19:08 ` Nicolin Chen
2026-09-02 0:21 ` Nicolin Chen
2026-09-02 1:51 ` Jason Gunthorpe [this message]
2026-09-01 17:36 ` Nicolin Chen
2026-04-27 8:53 ` [RFC PATCH v4 04/16] iommu/arm-smmu-v3: Track realm pSMMU users with refcount_t Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 05/16] coco: host: arm64: Add support for virtual device communication Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 06/16] coco: host: arm64: Add support for RMM vdev objects Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 07/16] coco: host: arm64: Add pdev stream key refresh and purge helpers Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 08/16] coco: host: arm64: Add helpers to unlock and destroy RMM vdev Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 09/16] coco: host: arm64: Add support for da object read RHI handling Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 10/16] coco: host: arm64: Add helper for cached object fetches Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 11/16] coco: host: arm64: Fetch interface report via RMI Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 12/16] coco: host: arm64: Fetch device measurements " Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 13/16] coco: host: KVM: arm64: Handle vdev validate-mapping exits Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 14/16] KVM: arm64: Unmap device mappings when a private granule is destroyed Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 15/16] coco: host: arm64: Transition vdevs to TDISP RUN state Aneesh Kumar K.V (Arm)
2026-04-27 8:53 ` [RFC PATCH v4 16/16] KVM: arm64: CCA: enable DA in realm create parameters Aneesh Kumar K.V (Arm)
2026-08-31 18:08 ` [RFC PATCH v4 00/16] coco/TSM: Implement host-side support for Arm CCA TDISP setup Jason Gunthorpe
2026-09-01 12:44 ` Aneesh Kumar K.V
2026-09-01 13:07 ` Jason Gunthorpe
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