linux-kernel - Re: [PATCH] iommu/vt-d: Enhance capability check for nested parent domain allocation

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Message-ID: <20231025113356.GX3952@nvidia.com>
Date:   Wed, 25 Oct 2023 08:33:56 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>
Cc:     Yi Liu <yi.l.liu@...el.com>, joro@...tes.org,
        alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, cohuck@...hat.com, eric.auger@...hat.com,
        nicolinc@...dia.com, kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
        chao.p.peng@...ux.intel.com, yi.y.sun@...ux.intel.com,
        peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com, joao.m.martins@...cle.com
Subject: Re: [PATCH] iommu/vt-d: Enhance capability check for nested parent
 domain allocation

On Wed, Oct 25, 2023 at 09:10:08AM +0800, Baolu Lu wrote:
> On 10/24/23 11:00 PM, Yi Liu wrote:
> > This adds the scalable mode check before allocating the nested parent domain
> > as checking nested capability is not enough. User may turn off scalable mode
> > which also means no nested support even if the hardware supports it.
> > 
> > Fixes: c97d1b20d383 ("iommu/vt-d: Add domain_alloc_user op")
> > Signed-off-by: Yi Liu <yi.l.liu@...el.com>
> > ---
> > v1: Based on Joao's dirty page tracking v6 https://github.com/jpemartins/linux/commits/iommufd-v6
> > ---
> >   drivers/iommu/intel/iommu.c | 2 +-
> >   drivers/iommu/intel/iommu.h | 2 ++
> >   2 files changed, 3 insertions(+), 1 deletion(-)
> 
> Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> Hi Jason,
> 
> Given that this fixes a commit in the iommufd tree, can you please pick
> this fix as well?

Done

Thanks
Jason