linux-kernel - Re: [PATCH v4 2/3] iommu/vt-d: Track device aux-attach with subdevice_domain

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Date:   Thu, 7 Jan 2021 14:39:03 +0000
From:   Will Deacon <will@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Liu Yi L <yi.l.liu@...el.com>, joro@...tes.org,
        kevin.tian@...el.com, ashok.raj@...el.com, jun.j.tian@...el.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        yi.y.sun@...el.com, dan.carpenter@...cle.com,
        Xin Zeng <xin.zeng@...el.com>
Subject: Re: [PATCH v4 2/3] iommu/vt-d: Track device aux-attach with
 subdevice_domain_info

On Thu, Jan 07, 2021 at 10:16:57PM +0800, Lu Baolu wrote:
> On 2021/1/7 21:49, Will Deacon wrote:
> > On Thu, Jan 07, 2021 at 12:03:56AM +0800, Liu Yi L wrote:
> > > In the existing code, loop all devices attached to a domain does not
> > > include sub-devices attached via iommu_aux_attach_device().
> > > 
> > > This was found by when I'm working on the below patch, There is no
> > > device in the domain->devices list, thus unable to get the cap and
> > > ecap of iommu unit. But this domain actually has subdevice which is
> > > attached via aux-manner. But it is tracked by domain. This patch is
> > > going to fix it.
> > > 
> > > https://lore.kernel.org/kvm/1599734733-6431-17-git-send-email-yi.l.liu@intel.com/
> > > 
> > > And this fix goes beyond the patch above, such sub-device tracking is
> > > necessary for other cases. For example, flushing device_iotlb for a
> > > domain which has sub-devices attached by auxiliary manner.
> > 
> > Sorry, but I'm having a really hard time understanding what this patch is
> > doing based on this commit message. Baolu -- do you think you could reword
> > it for me please? No need to resend the patch.
> 
> iommu/vt-d: Fix general protection fault in aux_detach_device()

[...]

Thanks! I'll push this out shortly.

Will