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From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
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 17:21:39 -0700	[thread overview]
Message-ID: <apdsEz7ipT3ABd6K@nvidia.com> (raw)
In-Reply-To: <apcitkpASOREamQs@nvidia.com>

On Tue, Sep 01, 2026 at 12:12:22PM -0700, Nicolin Chen wrote:
> On Tue, Sep 01, 2026 at 02:42:30PM -0300, Jason Gunthorpe wrote:
> > On Tue, Sep 01, 2026 at 10:13:04AM -0700, Nicolin Chen wrote:
> > Is there anything more than RMI_VSMMU_CREATE needed from a RMM
> > perspective? What about that dpt/ats stuff?
> 
> DPT is a bit hacky currently..
> 
> Prior to RMM v2.0 ABI, DPT was allocated statically in RMM; there
> was no RMI command for DPT allocations.
> 
> Now, with RMM v2.0 ABI, DPT can be managed via RMIs. I am making
> it follow GPT at this point, similar to the static idea. But, in
> the long run, I will think of decoupling, but I haven't looked at
> that closely.

Did a quick check. It's clear.

DPT is a system-wise global thing, not per SMMU or per realm. Each
table or entry is indexed by part of 48-bit in PA corresponding to
to a protected IPA. One thing that is related to a realm is a VMID
in the leaf entry. So, it should unlikely be coupling with VSMMU.

The other stuff is to map VSMMU's MMIO region in its IPA space but
it should be a part of the VSMMU-CREATE package.

Nicolin


  reply	other threads:[~2026-09-02  0:22 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 [this message]
2026-09-02  1:51                 ` Jason Gunthorpe
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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