linux-kernel - Re: [PATCH v1 05/14] iommu/arm-smmu-v3: Remove ARM_SMMU_DOMAIN

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Date:   Fri, 10 Mar 2023 16:24:20 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...dia.com>
CC:     Eric Auger <eric.auger@...hat.com>, <robin.murphy@....com>,
        <will@...nel.org>, <kevin.tian@...el.com>,
        <baolu.lu@...ux.intel.com>, <joro@...tes.org>,
        <shameerali.kolothum.thodi@...wei.com>, <jean-philippe@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 05/14] iommu/arm-smmu-v3: Remove ARM_SMMU_DOMAIN_NESTED

On Fri, Mar 10, 2023 at 01:05:36PM -0400, Jason Gunthorpe wrote:
> On Fri, Mar 10, 2023 at 05:39:22PM +0100, Eric Auger wrote:
> 
> > > Also drop the unused arm_smmu_enable_nesting(). One following patche will
> > > configure the correct smmu_domain->stage.
> > >
> > > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> > > ---
> > >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 18 ------------------
> > >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  1 -
> > If you go this way you may also remove it from arm/arm-smmu/arm-smmu.c.
> > Then if I am not wrong no other driver does implement enable_nesting cb.
> > Shouldn't we also remove it and fellow iommu_enable_nesting()?
> 
> Yes, lets just put this patch in the series please:
> 
> https://lore.kernel.org/kvm/0-v1-0093c9b0e345+19-vfio_no_nesting_jgg@nvidia.com/

Oh. Didn't read this before sending my previous reply..

Will do that.

Nic