From: Deepa Dinamani <deepa.kernel@gmail.com>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
joro@8bytes.org, David Woodhouse <dwmw2@infradead.org>,
iommu@lists.linux-foundation.org
Subject: Re: [PATCH v2] iommu/vt-d: Turn off translations at shutdown
Date: Sun, 10 Nov 2019 19:21:45 -0800 [thread overview]
Message-ID: <CABeXuvofh-z97=iq9S7E1igbzyWwNU-MPbuCjNa_gzC3Q=L7hg@mail.gmail.com> (raw)
In-Reply-To: <9e2e95e2-37ac-c0d6-d438-bd09ba7064bd@linux.intel.com>
On Sun, Nov 10, 2019 at 5:35 PM Lu Baolu <baolu.lu@linux.intel.com> wrote:
>
> Hi,
>
> On 11/11/19 1:27 AM, Deepa Dinamani wrote:
> > The intel-iommu driver assumes that the iommu state is
> > cleaned up at the start of the new kernel.
> > But, when we try to kexec boot something other than the
> > Linux kernel, the cleanup cannot be relied upon.
> > Hence, cleanup before we go down for reboot.
> >
> > Keeping the cleanup at initialization also, in case BIOS
> > leaves the IOMMU enabled.
>
> Do you mind shining more light on this statement? I can't get your point
> here. Currently iommu_shutdown() only happens for reboot, right?
In this part, I'm saying that I'm leaving intel_iommu_init() alone.
I'm not taking out disabling the iommu from intel_iommu_init(). This
will help when BIOS has enabled the IOMMU and for whatever reason, the
kernel is booting with IOMMU off.
-Deepa
next prev parent reply other threads:[~2019-11-11 3:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-10 17:27 [PATCH v2] iommu/vt-d: Turn off translations at shutdown Deepa Dinamani
2019-11-11 1:32 ` Lu Baolu
2019-11-11 3:21 ` Deepa Dinamani [this message]
2019-11-11 4:58 ` Lu Baolu
2019-11-11 5:00 ` Lu Baolu
2019-11-11 15:08 ` Joerg Roedel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CABeXuvofh-z97=iq9S7E1igbzyWwNU-MPbuCjNa_gzC3Q=L7hg@mail.gmail.com' \
--to=deepa.kernel@gmail.com \
--cc=baolu.lu@linux.intel.com \
--cc=dwmw2@infradead.org \
--cc=iommu@lists.linux-foundation.org \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).