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smblock
2013 Oct 21
5
I/O port access handling for PVH
George,
since you asked on Friday, I though about the situation some more
over the weekend.
On PV, the requirement to trap all INs and OUTs is a result from us
needing the enforce two levels of restrictions - Xen''s and the guest
kernel''s. I.e. we can''t make use of the hardware''s access control
mechanisms, as we can''t put two I/O bit maps in place, and