linux-kernel - Re: [PATCH 1/5] iommu/vt-d: Block force-snoop domain attaching if no SC support

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Message-ID: <20220502130459.GH8364@nvidia.com>
Date:   Mon, 2 May 2022 10:04:59 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] iommu/vt-d: Block force-snoop domain attaching if no
 SC support

On Sun, May 01, 2022 at 07:24:30PM +0800, Lu Baolu wrote:
> In the attach_dev callback of the default domain ops, if the domain has
> been set force_snooping, but the iommu hardware of the device does not
> support SC(Snoop Control) capability, the callback should block it and
> return a corresponding error code.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel/iommu.c | 3 +++
>  1 file changed, 3 insertions(+)

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

Jason