From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tim Deegan <tim@xen.org>
Subject: Re: unable to capture an expected page fault
Date: Tue, 17 Jan 2012 11:12:22 +0000
Message-ID: <20120117111222.GC74654@ocelot.phlegethon.org>
References: <CAJEOSFtHjhU1=eQ8ghDTcKvErso46OgAqOL8-jKeae0QnywDjw@mail.gmail.com>
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Hi, 

At 03:08 -0500 on 17 Jan (1326769684), Study Xen wrote:
> I was trying to modify part of Xen and faced a page fault missing issue.
> 
> I am testing a PV Linux 64-bit guest (kernel 3.1.1, as dom0, the only
> domain in my setting) atop Xen 4.1.2. In an unmodified Xen, the Linux
> kernel's "native_set_pte" in "arch/x86/include/asm/pgtable_64.h" traps into
> Xen due to Xen's write-protection of the pagetable page. But in our
> modified version, this expected page fault seems missing.

Well, I suppose it must be something you changed. :)  But since you don't
say what you changed I'm not sure how much we can help you.  If the
pagetables are indeed correct then maybe you're missing a TLB flush
somewhere?

Tim.