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

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Date:	Mon, 5 Mar 2007 15:27:15 +0100
From:	Andi Kleen <ak@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Roland McGrath <roland@...hat.com>,
	Andi Kleen <ak@...e.de>, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch] paravirt: VDSO page is essential

On Mon, Mar 05, 2007 at 01:06:31PM +0100, Ingo Molnar wrote:
> Subject: [patch] paravirt: VDSO page is essential
> From: Ingo Molnar <mingo@...e.hu>
> 
> commit 3bbf54725467d604698721384d858b5983b87e8f disables the VDSO for 
> CONFIG_PARAVIRT kernels. This #ifdeffery was a bad change: the VDSO is 

Well it was the change that made my test machine (with SUSE 9.0 userland)
work with CONFIG_PARAVIRT on. If you have a better solution please post
it.

> an essential component of Linux, and this change forces all of them to 
> use int $0x80 - including sane ones like KVM. (If a hypervisor does not 
> handle the VDSO properly then it can work things around via the vdso=0 

No hypervisor involved, just CONFIG_PARAVIRT=y on bare hardware.

> boot option. Or CONFIG_PARAVIRT should not have been merged. But in any 
> case, it is a basic taste issue: we DO NOT #ifdef around core features 
> like this!)

We set sensible defaults for full backwards compatibility. 

-Andi
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