Date: Wed, 15 Mar 2006 01:41:49 -0800
From: Chris Wright <chrisw@sous-sol.org>
To: Zachary Amsden <zach@vmware.com>
Cc: Chris Wright <chrisw@sous-sol.org>, Gerd Hoffmann <kraxel@suse.de>,
       Linus Torvalds <torvalds@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Virtualization Mailing List <virtualization@lists.osdl.org>,
       Xen-devel <xen-devel@lists.xensource.com>,
       Andrew Morton <akpm@osdl.org>, Dan Hecht <dhecht@vmware.com>,
       Dan Arai <arai@vmware.com>, Anne Holler <anne@vmware.com>,
       Pratap Subrahmanyam <pratap@vmware.com>,
       Christopher Li <chrisl@vmware.com>, Joshua LeVasseur <jtl@ira.uka.de>,
       Rik Van Riel <riel@redhat.com>, Jyothy Reddy <jreddy@vmware.com>,
       Jack Lo <jlo@vmware.com>, Kip Macy <kmacy@fsmware.com>,
       Jan Beulich <jbeulich@novell.com>,
       Ky Srinivasan <ksrinivasan@novell.com>,
       Wim Coekaerts <wim.coekaerts@oracle.com>,
       Leendert van Doorn <leendert@watson.ibm.com>
Subject: Re: [RFC, PATCH 7/24] i386 Vmi memory hole
Message-ID: <20060315094149.GT12807@sorel.sous-sol.org>
References: <200603131804.k2DI4N6s005678@zach-dev.vmware.com> <20060314064107.GK12807@sorel.sous-sol.org> <44166D6B.4090701@vmware.com> <20060314215616.GM12807@sorel.sous-sol.org> <4417454F.2080908@vmware.com> <20060315043108.GP12807@sorel.sous-sol.org> <4417CFDA.1060806@suse.de> <4417D212.20401@vmware.com> <20060315090935.GS12807@sorel.sous-sol.org> <4417DBE8.6070302@vmware.com>
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* Zachary Amsden (zach@vmware.com) wrote:
> >+       DEFINE(VSYSCALL_BASE, (PAGE_OFFSET - 2*PAGE_SIZE));
> 
> Ok, I'm confused.  What fixed math?

Sorry, bad choice of words.  From above, the VYSYCALL_BASE is known
at compile time (in asm-offsets.h).  So the SYSENTER_RETURN is still
fixed addr.  For execshield it's truly dynamic, so you get something
like this instead of the constant SYSENTER_RETURN:

-	pushl $SYSENTER_RETURN
+	pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp)

thanks,
-chris
-
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