From: Nicolin Chen <nicolinc@nvidia.com>
To: Shameer Kolothum Thodi <skolothumtho@nvidia.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
Catalin Marinas <catalin.marinas@arm.com>,
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Subject: Re: [PATCH v1 8/8] iommu/arm-smmu-v3: Probe a guest-level Realm VSMMU via RSI commands
Date: Wed, 28 Oct 2026 11:08:56 -0700 [thread overview]
Message-ID: <auI6OGDh723S+6Dh@nvidia.com> (raw)
In-Reply-To: <SJ0PR12MB861403B542B8D63B2AACE18EAB6F2@SJ0PR12MB8614.namprd12.prod.outlook.com>
On Wed, Oct 28, 2026 at 08:41:13AM -0700, Shameer Kolothum Thodi wrote:
> > @@ -5542,6 +5591,12 @@ static int arm_smmu_device_probe(struct
> > platform_device *pdev)
> > }
> > ioaddr = res->start;
> >
> > + if (is_realm_world()) {
> > + ret = arm_smmu_probe_realm_vsmmu(smmu, res);
> > + if (ret)
> > + return ret;
> > + }
>
> If probe fails after activation succeeds above, wouldn't a module
> reload hit RSI_ERROR_DEVICE since the VSMMU is still ACTIVE?
>
> B5.4.1.2:
>
> pre: vsmmu.state == VSMMU_ACTIVE
> post: result == RSI_ERROR_DEVICE
>
> How is recovery handled?
There is no way to undo an activation. But what's the practical
use case for the SMMU driver to do a module reload?
Nicolin
next prev parent reply other threads:[~2026-10-28 18:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-10 3:32 [PATCH v1 0/8] iommu/arm-smmu-v3: Support guest-level Realm VSMMU (Part-1) Nicolin Chen
2026-09-10 3:32 ` [PATCH v1 1/8] firmware: arm_rmm: Move RSI support out of arch/arm64 Nicolin Chen
2026-09-10 3:32 ` [PATCH v1 2/8] firmware: arm_rmm: Add VSMMU commands and fields Nicolin Chen
2026-10-28 9:49 ` Shameer Kolothum Thodi
2026-10-28 12:35 ` Jason Gunthorpe
2026-10-28 18:38 ` Nicolin Chen
2026-10-29 10:05 ` Shameer Kolothum Thodi
2026-10-29 12:28 ` Jason Gunthorpe
2026-09-10 3:32 ` [PATCH v1 3/8] dma-mapping: Let a device declare that it reaches private memory Nicolin Chen
2026-09-10 3:32 ` [PATCH v1 4/8] dma-mapping: Keep DMA memory private for capable devices Nicolin Chen
2026-10-28 10:42 ` Shameer Kolothum Thodi
2026-10-28 12:38 ` Jason Gunthorpe
2026-09-10 3:32 ` [PATCH v1 5/8] iommu: Let a driver mark an IOMMU as confidential Nicolin Chen
2026-09-10 3:32 ` [PATCH v1 6/8] iommu: Introduce TDISP T=0 state for confidential IOMMUs Nicolin Chen
2026-09-17 10:48 ` sonang patel
2026-09-17 13:34 ` Jason Gunthorpe
2026-09-10 3:32 ` [PATCH v1 7/8] iommu: Park TDISP T=0 devices in the blocking domain Nicolin Chen
2026-10-28 14:19 ` Shameer Kolothum Thodi
2026-10-28 15:09 ` Jason Gunthorpe
2026-10-28 18:51 ` Nicolin Chen
2026-09-10 3:32 ` [PATCH v1 8/8] iommu/arm-smmu-v3: Probe a guest-level Realm VSMMU via RSI commands Nicolin Chen
2026-09-10 4:23 ` Nicolin Chen
2026-10-28 15:41 ` Shameer Kolothum Thodi
2026-10-28 18:08 ` Nicolin Chen [this message]
2026-10-29 7:58 ` Shameer Kolothum Thodi
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