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, smostafa@google.com,
linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
jonathan.cameron@huawei.com
Subject: Re: [PATCH v4 08/10] iommu/arm-smmu-v3: Allocate INV_TYPE_S2_VMID_VSMMU in arm_vsmmu_init
Date: Thu, 9 Apr 2026 21:19:53 -0300 [thread overview]
Message-ID: <20260410001953.GB3357077@nvidia.com> (raw)
In-Reply-To: <05dd00dcb2f0d077f59bcbccac1820534ad7b5cf.1773949042.git.nicolinc@nvidia.com>
On Thu, Mar 19, 2026 at 12:51:54PM -0700, Nicolin Chen wrote:
> 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
>
> Allocate/free a VMID in arm_vsmmu_init/destroy(). This decouples the VMID
> owned by vSMMU from the VMID living in the S2 parent domain (s2_cfg.vmid).
>
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
> .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 26 ++++++++++++++++---
> .../iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 1 +
> 3 files changed, 25 insertions(+), 3 deletions(-)
Yeah, this is exactly right now.. The vmid exists for the duration of
viommu and gets installed in the invs list when the s2 is actually
attached to a device.
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Jason
next prev parent reply other threads:[~2026-04-10 0:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 19:51 [PATCH v4 00/10] iommu/arm-smmu-v3: Share domain across SMMU/vSMMU instances Nicolin Chen
2026-03-19 19:51 ` [PATCH v4 01/10] iommu/arm-smmu-v3: Add a wrapper for arm_smmu_make_sva_cd() Nicolin Chen
2026-04-09 23:14 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 02/10] iommu/arm-smmu-v3: Pass in arm_smmu_make_cd_fn to arm_smmu_set_pasid() Nicolin Chen
2026-04-09 23:17 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 03/10] iommu/arm-smmu-v3: Store IOTLB cache tags in struct arm_smmu_attach_state Nicolin Chen
2026-04-09 23:42 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 04/10] iommu/arm-smmu-v3: Pass in IOTLB cache tag to arm_smmu_master_build_invs() Nicolin Chen
2026-04-09 23:43 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 05/10] iommu/arm-smmu-v3: Pass in IOTLB cache tag to CD and STE Nicolin Chen
2026-03-19 19:51 ` [PATCH v4 06/10] iommu/arm-smmu-v3: Introduce INV_TYPE_S2_VMID_VSMMU Nicolin Chen
2026-04-09 23:59 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 07/10] iommu/arm-smmu-v3: Allocate IOTLB cache tag if no id to reuse Nicolin Chen
2026-04-10 0:04 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 08/10] iommu/arm-smmu-v3: Allocate INV_TYPE_S2_VMID_VSMMU in arm_vsmmu_init Nicolin Chen
2026-04-10 0:19 ` Jason Gunthorpe [this message]
2026-03-19 19:51 ` [PATCH v4 09/10] iommu/arm-smmu-v3: Remove ASID/VMID from arm_smmu_domain Nicolin Chen
2026-04-10 0:27 ` Jason Gunthorpe
2026-03-19 19:51 ` [PATCH v4 10/10] iommu/arm-smmu-v3: Allow sharing domain across SMMUs Nicolin Chen
2026-04-10 0:32 ` Jason Gunthorpe
2026-04-10 0:36 ` Jason Gunthorpe
2026-04-10 1:18 ` Nicolin Chen
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