archive mirror
 help / color / mirror / Atom feed
From: Lu Baolu <>
To: Deepa Dinamani <>
	Linux Kernel Mailing List <>,, David Woodhouse <>,
Subject: Re: [PATCH v2] iommu/vt-d: Turn off translations at shutdown
Date: Mon, 11 Nov 2019 12:58:28 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>


On 11/11/19 11:21 AM, Deepa Dinamani wrote:
> On Sun, Nov 10, 2019 at 5:35 PM Lu Baolu <> 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.

Okay, thanks for the explanation.

> -Deepa

Best regards,

  reply	other threads:[~2019-11-11  5:02 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
2019-11-11  4:58     ` Lu Baolu [this message]
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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \

* 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).