Message-ID: <4417E03E.9000009@vmware.com>
Date: Wed, 15 Mar 2006 01:37:02 -0800
From: Zachary Amsden <zach@vmware.com>
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To: Gerd Hoffmann <kraxel@suse.de>
Cc: Chris Wright <chrisw@sous-sol.org>, 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
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> <4417DDF3.4060601@suse.de>
In-Reply-To: <4417DDF3.4060601@suse.de>
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Gerd Hoffmann wrote:
>>        pushl $SYSENTER_RETURN
>>
>> SYSENTER_RETURN is a link time constant that is defined based on the
>> location of the vsyscall page.  If the vsyscall page can move, this can
>> not be a constant.
>>     
>
> The vsyscall page is at PAGE_OFFSET - 2*PAGE_SIZE.  It doesn't move.  At
> least not at runtime.  At compile time it can change with the new
> VMSPLIT config options, but that isn't a problem ;)
>   

Okay, I get it now.  Thanks for the explanation.  This certainly does 
simplify the problem.

Zach
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