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

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Message-ID: <20250408120919.GB1727154@ziepe.ca>
Date: Tue, 8 Apr 2025 09:09:19 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, will@...nel.org,
	robin.murphy@....com, 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, Apr 08, 2025 at 09:03:51AM +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);
> 
> This patch adds the missing detection logic to prevent allocation
> failure when S2FWB is supported.
> 
> Fixes: 67e4fe398513 ("iommu/arm-smmu-v3: Use S2FWB for NESTED domains")
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 2 ++
>  1 file changed, 2 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

This should go to rc

Jason