Re: [Xen-ia64-devel] [PATCH] fix wrong insertion of TLB entry in region 0

[tgingold@xxxxxxx]

Quoting Kouya Shimura <kouya@xxxxxxxxxxxxxx>:

> On PV domain with metaphysical mode, emulation of itc.d in region 0
> doesn't work well and inserts an wrong TC entry.
> Because set_one_rr() doesn't set the machine region register.
> i.e. metaphyisical_rr0 is used instead of guest's rr[0].
>
> This bug causes Dom0/U crash when an application uses region 0.
> Actually I met the crash when I was building open GFW (java uses
> region 0).

I am a little bit puzzled.  Isn't saved_rr0 supposed to be the mangled version
of rr[0] ?  Either this patch should be a no-op or the bug is somewhere else
(or I am wrong).

Tristan.

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