RE: [Xen-ia64-devel] [PATCH] fix access rights in VHPT whenitr.ar!=dtr.ar

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

Hi kouya,

Another solution is to set dtr[1].ar=3(RWX) too,
This will not incur any impact.
Because itr[1].ar=3(RWX). There are same mapping for data and instruction.

The upside is there is no impossible INST_ACCESS_RIGHTS.

- Anthony 

-----Original Message-----
From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kouya SHIMURA
Sent: 2007年3月20日 16:33
To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-ia64-devel] [PATCH] fix access rights in VHPT whenitr.ar!=dtr.ar

Hi,

This is a workaround patch for Windows 2003 Server.
Windows (vcpu>=2) set itr[1].ar=3(RWX) but dtr[1].ar=2(RW).
It causes a impossible INST_ACCESS_RIGHTS interruption via VHPT
which is used for emulating TR.

Surprisingly, windows ordinarily accepts this interruption. 
But windows sometimes crashes with the message 'PANIC_STACK_SWITCH'
owing to this interruption.

Thanks,
Kouya

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

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