From: Jason Gunthorpe <jgg@nvidia.com>
To: Nicolin Chen <nicolinc@nvidia.com>
Cc: will@kernel.org, robin.murphy@arm.com, joro@8bytes.org,
jpb@kernel.org, praan@google.com, miko.lenczewski@arm.com,
linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, patches@lists.linux.dev
Subject: Re: [PATCH v2 06/10] iommu/arm-smmu-v3: Allocate vmid in arm_vsmmu_init
Date: Tue, 27 Jan 2026 13:58:13 -0400 [thread overview]
Message-ID: <20260127175813.GN1134360@nvidia.com> (raw)
In-Reply-To: <aXjxss9H3NQ/qe+m@Asurada-Nvidia>
On Tue, Jan 27, 2026 at 09:11:14AM -0800, Nicolin Chen wrote:
> > It is easy to understand that lifecycle by just allocating it for the
> > lifetime of the VSMMU..
>
> Yea, it makes sense for that matter.
>
> So, perhaps:
>
> VMID owned by a vSMMU should be allocated in the viommu_init callback for
> - a straightforward lifecycle for a VMID used by a vSMMU
> - HW like tegra241-cmdqv needs to setup VINTF with the VMID
Yeah, the cmdqv should take the VMID from the vSMMU and that is a good
reason to pre-allocate it since it won't go through the invalidation
list.
Jason
next prev parent reply other threads:[~2026-01-27 17:58 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-22 1:24 [PATCH v2 00/10] iommu/arm-smmu-v3: Share domain across SMMU/vSMMU instances Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 01/10] iommu/arm-smmu-v3: Store IOTLB cache tags in struct arm_smmu_attach_state Nicolin Chen
2026-01-26 20:44 ` Jason Gunthorpe
2026-01-27 3:23 ` Nicolin Chen
2026-01-27 15:08 ` Jason Gunthorpe
2026-01-27 16:58 ` Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 02/10] iommu/arm-smmu-v3: Pass in IOTLB cache tag to CD and STE Nicolin Chen
2026-01-26 20:53 ` Jason Gunthorpe
2026-01-27 3:28 ` Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 03/10] iommu/arm-smmu-v3: Look for existing iotlb tag in smmu_domain->invs Nicolin Chen
2026-01-26 21:03 ` Jason Gunthorpe
2026-01-27 2:50 ` Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 04/10] iommu/arm-smmu-v3: Allocate IOTLB cache tag if no id to reuse Nicolin Chen
2026-01-26 21:06 ` Jason Gunthorpe
2026-01-26 22:23 ` Nicolin Chen
2026-01-27 16:29 ` Jason Gunthorpe
2026-01-27 16:52 ` Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 05/10] iommu/arm-smmu-v3: Flush iotlb in arm_smmu_iotlb_tag_free() Nicolin Chen
2026-01-26 21:08 ` Jason Gunthorpe
2026-01-27 2:56 ` Nicolin Chen
2026-01-27 15:09 ` Jason Gunthorpe
2026-01-22 1:24 ` [PATCH v2 06/10] iommu/arm-smmu-v3: Allocate vmid in arm_vsmmu_init Nicolin Chen
2026-01-26 21:16 ` Jason Gunthorpe
2026-01-27 3:06 ` Nicolin Chen
2026-01-27 15:11 ` Jason Gunthorpe
2026-01-27 17:11 ` Nicolin Chen
2026-01-27 17:58 ` Jason Gunthorpe [this message]
2026-01-22 1:24 ` [PATCH v2 07/10] iommu/arm-smmu-v3: Pass in vsmmu to arm_smmu_domain_get_iotlb_tag() Nicolin Chen
2026-01-26 21:20 ` Jason Gunthorpe
2026-01-27 3:34 ` Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 08/10] iommu/arm-smmu-v3: Introduce INV_TYPE_S2_VMID_VSMMU Nicolin Chen
2026-01-27 15:13 ` Jason Gunthorpe
2026-01-22 1:24 ` [PATCH v2 09/10] iommu/arm-smmu-v3: Remove ASID/VMID from arm_smmu_domain Nicolin Chen
2026-01-22 1:24 ` [PATCH v2 10/10] iommu/arm-smmu-v3: Allow sharing domain across SMMUs Nicolin Chen
2026-01-27 15:41 ` Jason Gunthorpe
2026-01-27 17:50 ` Nicolin Chen
2026-01-27 17:59 ` Jason Gunthorpe
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