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Date: Thu, 13 Apr 2006 20:54:06 +0400
From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
To: Andi Kleen <ak@suse.de>
Cc: Kirill Korotaev <dev@sw.ru>, Kir Kolyshkin <kir@openvz.org>, akpm@osdl.org,
       Nick Piggin <nickpiggin@yahoo.com.au>, sam@vilain.net,
       linux-kernel@vger.kernel.org,
       "Eric W. Biederman" <ebiederm@xmission.com>, serue@us.ibm.com,
       herbert@13thfloor.at
Subject: Re: [Devel] Re: [RFC] Virtualization steps
Message-ID: <20060413165406.GA7261@ms2.inr.ac.ru>
References: <1143228339.19152.91.camel@localhost.localdomain> <200603282029.AA00927@bbb-jz5c7z9hn9y.digitalinfra.co.jp> <4429A17D.2050506@openvz.org> <443151B4.7010401@tmr.com> <443B873B.9040908@sw.ru> <p73mzer4bti.fsf@bragg.suse.de>
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Hello!

> How would that work when x86-64 32bit programs have 4GB of address
> space and native on i386 programs only 3GB?

It is not the only obstacle. There are another ones:

1. Different values of segment registers. __USER32_* selectors should match
   ones on i386.
2. ia32 vsyscall page. It also must be the same, unless arch/i386 is changed
   to allow various mappins like 32bit page x86_64 works.

Well, if we want something to migrate, we have to pay.

Alexey