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Re: [PATCH] docs: UEFI Secure Boot security policy


  • To: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • From: Demi Marie Obenour <demiobenour@xxxxxxxxx>
  • Date: Thu, 12 Jun 2025 11:22:39 -0400
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  • Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Trammell Hudson <hudson@xxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Gerald Elder-Vass <gerald.elder-vass@xxxxxxxxx>, Kevin Lampis <kevin.lampis@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 12 Jun 2025 15:23:02 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 6/12/25 06:06, Jan Beulich wrote:
> On 12.06.2025 01:58, Andrew Cooper wrote:
>> 2) Pre-boot DMA Protection.  Microsoft consider this a platform feature
>> requiring OEM enablement, and do not consider its absence to be a Secure Boot
>> vulnerability.  But, it is less clear what the policy ought to be for Xen
>> booting on a capable system and failing to do a correct live-handover of the
>> IOMMU across ExitBootServices().
> 
> Shouldn't this be another TODO item at the bottom? We don't support yet taking
> over when the IOMMUs are already enabled, do we?

Dasharo supports leaving the IOMMU enabled when transferring to the OS, and
this message was sent from a Qubes OS box booted in this configuration.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)

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