linux-kernel - Re: [PATCH 0/2] ptrace_vm: ptrace for syscall emulation virtual machines

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Date:	Mon, 30 Mar 2009 00:32:28 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Renzo Davoli <renzo@...unibo.it>
Cc:	Am??rico Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, Jeff Dike <jdike@...toit.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	mtk.manpages@...il.com, Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH 0/2] ptrace_vm: ptrace for syscall emulation virtual
	machines

On Wed, Mar 25, 2009 at 12:47:53AM +0100, Renzo Davoli wrote:
>> Why not introduce a new request for PTRACE_VM but use *tags* in 'addr'?
>> We are taking risks of breaking the existing code. :)
>
>Yes, there is a minimal risk to break some code. This is a con.
>On the other side there are two main pros for this proposal:
>1- the code is now extremely simple 

Why adding a new request for ptrace is harder? I don't think so. :)


>2- if we define a different tag for syscall (e.g. PTRACE_VM), we need also
>different tags for PTRACE_VM_SINGLESTEP, PTRACE_VM_SINGLEBLOCK and maybe
>others in the future.
>Using the addr field we don't need this multiplication of tags
>(and we could soon delete PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP).
>

Yes? We could also remove PTRACE_SYSEMU* if we had PTRACE_VM to replace
it. I would like to hear more from you on this point.

Thanks.

-- 
Do what you love, f**k the rest! F**k the regulations!
 
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