linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Add missing S2FWB feature detection

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Message-Id: <174488913548.907912.11019680533308808678.b4-ty@kernel.org>
Date: Thu, 17 Apr 2025 15:27:25 +0100
From: Will Deacon <will@...nel.org>
To: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	robin.murphy@....com,
	jgg@...pe.ca,
	nicolinc@...dia.com,
	jsnitsel@...hat.com,
	praan@...gle.com,
	kevin.tian@...el.com,
	ddutile@...hat.com
Subject: Re: [PATCH] iommu/arm-smmu-v3: Add missing S2FWB feature detection

On Tue, 08 Apr 2025 09:03:51 +0530, Aneesh Kumar K.V (Arm) wrote:
> Commit 67e4fe398513 ("iommu/arm-smmu-v3: Use S2FWB for NESTED domains")
> introduced S2FWB usage but omitted the corresponding feature detection.
> As a result, vIOMMU allocation fails on FVP in arm_vsmmu_alloc(), due to
> the following check:
> 
> 	if (!arm_smmu_master_canwbs(master) &&
> 	    !(smmu->features & ARM_SMMU_FEAT_S2FWB))
> 		return ERR_PTR(-EOPNOTSUPP);
> 
> [...]

Applied to iommu (arm/smmu/fixes), thanks!

[1/1] iommu/arm-smmu-v3: Add missing S2FWB feature detection
      https://git.kernel.org/iommu/c/45e00e367189

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev