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[Xen-bugs] [Bug 1726] pvops dom0 crashes on boot up using Intel i9xx AGP

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Subject: [Xen-bugs] [Bug 1726] pvops dom0 crashes on boot up using Intel i9xx AGP driver when dom0_mem is no
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
Date: Mon, 31 Jan 2011 18:36:07 -0800
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------- Comment #6 from shaohui.zheng@xxxxxxxxx  2011-01-31 18:36 -------
Copied from Fengzhe's email.

In intel_i9xx_setup_flush (intel-agp.c), agp driver tries to map a "Flush Page"
using ioremap_nocache(). But the I/O page address passed to ioremap_nocache()
is not valid in both P2M and M2P tables. The page address is always 8MB over
max dom0_mem.

If I remove the ioremap logic, dom0 can boot successfully with no noticeable
error. The bug is reproduced on HP 7800p machine with Core2 processor and Q35

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