Xen devel - Oct 2010 - Regression in r22223 - memory corruption in VGA passthru

I''ve been getting memory corruption problems when using VGA passthru
after r22223:4beee5779122 "Vt-d: fix dom0 graphics problem on Levnovo
T410."
The domain that has the passthru (dom1) doesn''t exhibit problems, but a
domain started later (dom3) is apparently allocated memory that is part of
the framebuffer used by dom1; the domain''s memory is visible on the
screen
and updates to the screen write to the memory of dom3.

While bisecting, I noticed that this commit appears to remove a pre-domU-boot
initalization step; the speed of the domU startup is faster, and upon
shutdown the screen is not cleared with a repeating green-black pattern as
was normal prior to this commit.

-- 
Daniel De Graaf
National Security Agency

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