linux-kernel - Re: [PATCH v1 4/4] iommu/arm-smmu-v3-iommufd: Allow a shared s2

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Message-ID: <Z8iOsTIa37XzNcW1@Asurada-Nvidia>
Date: Wed, 5 Mar 2025 09:49:37 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
	"will@...nel.org" <will@...nel.org>, "robin.murphy@....com"
	<robin.murphy@....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 4/4] iommu/arm-smmu-v3-iommufd: Allow a shared
 s2_parent to allocate vSMMU

On Wed, Mar 05, 2025 at 12:57:43PM -0400, Jason Gunthorpe wrote:
> On Wed, Mar 05, 2025 at 09:01:40AM +0000, Shameerali Kolothum Thodi wrote:
> 
> > >  	if (!(smmu->features & ARM_SMMU_FEAT_NESTING))
> > >  		return ERR_PTR(-EOPNOTSUPP);
> > > 
> > > -	if (s2_parent->smmu != master->smmu)
> > > -		return ERR_PTR(-EINVAL);
> > > -
> > 
> > Not sure we can just relax this like this. What if the two physical SMMUs are different in
> > functionality/features? Do we need some kind of sanity check here?
> 
> Yes, a function to check if a domain's iopgtbl config is compatible
> with the instance is required.

Yea. Will rework.

Thanks!
Nicolin