linux-kernel - Re: A proposal

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Date:	Fri, 4 Aug 2006 17:40:39 -0400
From:	"Bill Rugolsky Jr." <brugolsky@...emetry-investments.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	David Lang <dlang@...italinsight.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Antonio Vargas <windenntw@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...l.org>, jeremy@...source.com,
	greg@...ah.com, zach@...are.com, linux-kernel@...r.kernel.org,
	torvalds@...l.org, hch@...radead.org, jlo@...are.com,
	xen-devel@...ts.xensource.com, simon@...source.com,
	ian.pratt@...source.com
Subject: Re: A proposal - binary

On Fri, Aug 04, 2006 at 02:26:20PM -0700, Jeremy Fitzhardinge wrote:
> >I also am missing something here. how can a system be compiled to do 
> >several different things for the same privilaged opcode (including 
> >running that opcode) without turning that area of code into a 
> >performance pig as it checks for each possible hypervisor being present?
> 
> Conceptually, the paravirtops structure is a structure of pointers to 
> functions which get filled in at runtime to support whatever hypervisor 
> we're running over.  But it also has the means to patch inline versions 
> of the appropriate code sequences for performance-critical operations.

Perhaps Ulrich and Jakub should join this discussion, as the whole
thing sounds like a rehash of the userland ld.so + glibc versioned ABI.
glibc has weathered 64-bit LFS changes to open(), SYSENTER, and vdso.

Isn't this discussion entirely analogous (except for the patching of
performance critical sections, perhaps) to taking a binary compiled
against glibc-2.0 back on Linux-2.2 and running it on glibc-2.4 + 2.6.17?
Or OpenSolaris, for that matter?

	Bill Rugolsky
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