linux-kernel - Re: [PATCH v1 1/4] iommu/arm-smmu-v3: Pass in vmid to arm_smmu_make_s2_domain

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Message-ID: <Z8iNfnZ9N5Lczxmq@Asurada-Nvidia>
Date: Wed, 5 Mar 2025 09:44:30 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
CC: "will@...nel.org" <will@...nel.org>, "robin.murphy@....com"
	<robin.murphy@....com>, "jgg@...dia.com" <jgg@...dia.com>, "joro@...tes.org"
	<joro@...tes.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/4] iommu/arm-smmu-v3: Pass in vmid to
 arm_smmu_make_s2_domain_ste()

On Wed, Mar 05, 2025 at 08:50:17AM +0000, Shameerali Kolothum Thodi wrote:
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> > b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> > index bd9d7c85576a..e08c4ede4b2d 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> > @@ -887,7 +887,7 @@ struct arm_smmu_entry_writer_ops {
> >  void arm_smmu_make_abort_ste(struct arm_smmu_ste *target);
> >  void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
> >  				 struct arm_smmu_master *master,
> > -				 struct arm_smmu_domain *smmu_domain,
> > +				 struct arm_smmu_domain *smmu_domain,
> > u16 vmid,
> >  				 bool ats_enabled);
> 
> Now that vmid is an input, do we need some kind of validation here as
> at least vmid = 0 is reserved I guess for bypass STEs.

Perhaps it should do a WARN_ON_ONCE(!vmid), as it doesn't make
sense for a caller to make an S2-bypass STE with this function.

Thanks
Nicolin