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From: Joerg Roedel <>
To: Gil Kupfer <>
	Gil Kupfer <>
Subject: Re: [RFC/RFT] Add noats flag to boot parameters
Date: Thu, 3 May 2018 15:35:00 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Sun, Apr 29, 2018 at 09:16:48PM +0300, Gil Kupfer wrote:
> This patch adds noats option to the pci boot parameter.
> When noats is selected, all ATS related functions fail immediately and
> the IOMMU is configured to not use device-iotlb.
> Any function that checks for ATS capabilities directly against the
> devices should also check this flag. (Currently, such functions exist
> only in IOMMU drivers, and they are covered by this patch.)
> The motivation behind this patch is the existence of malicious devices.
> Lots of research has been done about how to utilitize the IOMMU as a
> protection from such devices. When ATS is supported, any I/O device can
> access any physical access by faking device-IOTLB entries.
> Adding the ability to ignore these entries lets sysadmins enhance system
> security.
> Signed-off-by: Gil Kupfer <>

This has also been on my list, thanks for doing that.

Acked-by: Joerg Roedel <>

  reply	other threads:[~2018-05-03 13:35 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-29 18:16 Gil Kupfer
2018-05-03 13:35 ` Joerg Roedel [this message]
2018-05-03 13:46   ` Sinan Kaya
2018-05-03 13:59     ` Joerg Roedel
2018-05-03 14:23       ` Sinan Kaya
2018-05-03 22:15         ` Nadav Amit
2018-05-03 22:52         ` Bjorn Helgaas
2018-05-10 23:09 ` Bjorn Helgaas

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