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Add dev FAQ entry: QEMU is not part of the TCB

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Andrew David Wong 2017-02-16 19:27:15 -08:00
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@ -50,5 +50,12 @@ The policy is there mostly to ease maintenance, on several levels:
Qubes-specific features - a change in one supported distribution should be
followed also in others (including some new in the future)
Is QEMU part of the TCB?
------------------------
No. Unlike many other virtualization systems, Qubes takes special effort to keep
the I/O emulation component (QEMU) _outside_ of the TCB. This has been achieved
thanks to the careful use of Xen's stub domain feature. For more details about
how we improved on Xen's native stub domain use, see
[here](https://blog.invisiblethings.org/2012/03/03/windows-support-coming-to-qubes.html).