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xen-ia64-devel
RE: [Xen-ia64-devel] [PATCH] fix access rights in VHPT whenitr.ar!=dtr.a
Hi Anthony,
Exactly.
But I was not confident that it is permissive to set dtr.ar=3(RWX)
instead of dtr.ar=2(RW).
If we did that, the original value would be lost.
The value is observable by xenctx command.
And PAL_VM_TR_READ is not implemented yet but it would return the
wrong value. :)
Thanks,
Kouya
Xu, Anthony writes:
> 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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