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Date:   Thu, 5 Apr 2018 18:59:49 +0100
From:   Alan Cox <gnomes@lxorguk.ukuu.org.uk>
To:     Matthew Garrett <mjg59@google.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>, luto@kernel.org,
        David Howells <dhowells@redhat.com>,
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        linux-api@vger.kernel.org, Kees Cook <keescook@chromium.org>,
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Subject: Re: [GIT PULL] Kernel lockdown for secure boot
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> How? When there are random DMA-capable PCI devices that are driven by
> userland tools that are mmap()ing the BARs out of sysfs, how do we
> simultaneously avoid breaking those devices while also preventing the
> majority of users from being vulnerable to an attacker just DMAing over the
> kernel?

VT-D