linux-kernel - Re: [patch] paravirt: VDSO page is essential

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Message-ID: <20070306075057.GA6495@elte.hu>
Date:	Tue, 6 Mar 2007 08:50:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Zachary Amsden <zach@...are.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization <virtualization@...ts.osdl.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] paravirt: VDSO page is essential


* Zachary Amsden <zach@...are.com> wrote:

> > yeah. (plus my patches of course that remove the current 
> > papering-over hackery and restores COMPAT_VDSO.)
> 
> Yes, I don't have a problem with your patch, I just wish I had been 
> cc'd on it. [...]

(i Cc:-ed you to the other ones - i simply forgot and bounced it to you 
a few hours down the line - sorry!)

> [...] Fixing this is rather tricky, but I believe no strange build 
> magic is required, it can be done in kernel init code.  Still building 
> my SUSE 9.0 guest to test.  SUSE 9.0 is one of those that requires 
> COMPAT_VDSO, yes?

yeah, and a handful of other ones. It depends on the glibc version: 
early vdso glibs were buggy and assumed a few things about the vdso, so 
they would segfault on the new-style vdso which is fully relocatable 
(and hence mergable into the vma space, randomizable, etc.).

	Ingo
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