From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>,
stable@vger.kernel.org,
Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>,
Ashok Raj <ashok.raj@intel.com>, Camille Lu <camille.lu@hpe.com>
Subject: Re: [PATCH 1/1] iommu/vt-d: Fix agaw for a supported 48 bit guest address width
Date: Mon, 16 Aug 2021 14:37:52 +0200 [thread overview]
Message-ID: <YRpcIKvXY3LzXaqt@kroah.com> (raw)
In-Reply-To: <76945715-9a4c-2f94-b458-b6ab53d40a1c@linux.intel.com>
On Mon, Aug 16, 2021 at 08:20:31PM +0800, Lu Baolu wrote:
> Hi Greg,
>
> On 2021/8/16 19:48, Greg Kroah-Hartman wrote:
> > On Mon, Aug 16, 2021 at 07:39:32PM +0800, Lu Baolu wrote:
> > > From: Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>
> > >
> > > [ Upstream commit 327d5b2fee91c404a3956c324193892cf2cc9528 ]
> >
> > Also, this really does not look like this commit at all :(
> >
>
> This is not a back port. It's a fix for some stable kernels. Sorry for
> the confusion.
>
> The error happens in a helper function that has been deprecated in the
> upstream kernel by above commit. I added below explanation in the commit
> message:
>
> "
> This issue happens on the code path of getting a private domain for a
> device. A private domain was needed when the domain of an iommu group
> couldn't meet the requirement of a device. The IOMMU core has been
> evolved to eliminate the need for private domain, hence this code path
> has already been removed from the upstream since commit 327d5b2fee91c
> ("iommu/vt-d: Allow 32bit devices to uses DMA domain"). Instead of back
> porting all patches that are required for removing the private domain,
> this simply fixes it in the affected stable kernel between v4.16 and v5.7.
> "
>
> I'm sorry if this is not the right way to do this.
Ah, sorry, I totally missed that. This is fine, now queued up for
4.19.y and 5.4.y.
thanks,
greg k-h
next prev parent reply other threads:[~2021-08-16 12:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-16 11:39 [PATCH 1/1] iommu/vt-d: Fix agaw for a supported 48 bit guest address width Lu Baolu
2021-08-16 11:47 ` Greg Kroah-Hartman
2021-08-16 11:48 ` Greg Kroah-Hartman
2021-08-16 12:20 ` Lu Baolu
2021-08-16 12:37 ` Greg Kroah-Hartman [this message]
2021-08-16 13:15 ` Lu Baolu
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