From: Andi Kleen <ak@suse.de>
To: Zachary Amsden <zach@vmware.com>
Cc: virtualization@lists.osdl.org, Andrew Morton <akpm@osdl.org>,
Chris Wright <chrisw@osdl.org>,
Linus Torvalds <torvalds@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Martin Bligh <mbligh@mbligh.org>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 19/21] i386 Kprobes semaphore fix
Date: Wed, 9 Nov 2005 14:38:09 +0100 [thread overview]
Message-ID: <200511091438.11848.ak@suse.de> (raw)
In-Reply-To: <4370A9F5.4060103@vmware.com>
On Tuesday 08 November 2005 14:36, Zachary Amsden wrote:
> One can imagine clever uses for ptrace to do, say user space
> virtualization (since I'm on the topic), or other neat things. So there
> is nothing really wrong about having the fully correct EIP conversion
> (and here we shouldn't need to worry about races causing some issues
> with strict correctness, since there can be one external control thread).
Well, the code still scaries me a bit, but ok. x86-64 left at least one case
intentionally out.
> But were kprobes even inteneded for userspace? There are races here
> that are difficult to close without some heavy machinery, and I would
> rather not put the machinery in place if simplifying the code is the
> right answer.
I believe user space kprobes are being worked on by some IBM India folks yes.
-Andi
next prev parent reply other threads:[~2005-11-09 13:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 4:39 [PATCH 19/21] i386 Kprobes semaphore fix Zachary Amsden
2005-11-08 13:12 ` Andi Kleen
2005-11-08 13:36 ` Zachary Amsden
2005-11-09 13:38 ` Andi Kleen [this message]
2005-11-09 16:46 ` Zachary Amsden
2005-11-09 16:58 ` Ingo Molnar
2005-11-09 17:52 ` Zachary Amsden
2005-11-10 18:09 ` Prasanna S Panchamukhi
2005-11-10 14:58 ` Zachary Amsden
2005-11-10 16:16 ` H. Peter Anvin
2005-11-11 15:27 ` Andi Kleen
2005-11-11 15:25 ` Andi Kleen
2005-11-14 5:54 ` Prasanna S Panchamukhi
[not found] ` <20051109093755.GA10361@in.ibm.com>
2005-11-10 16:33 ` Prasanna S Panchamukhi
[not found] <20051108074430.GG28201@elte.hu>
2005-11-08 13:26 ` Zachary Amsden
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