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Date: Mon, 26 Oct 2009 00:31:46 +0100
Message-ID: <c62985530910251631v4c0ccf7ak91b376c97666001b@mail.gmail.com>
Subject: Re: [PATCH 4/6] hw-breakpoints: Rewrite the hw-breakpoints layer on 
	top of perf events
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Jan Kiszka <jan.kiszka@web.de>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
       Prasad <prasad@linux.vnet.ibm.com>,
       Alan Stern <stern@rowland.harvard.edu>,
       Peter Zijlstra <peterz@infradead.org>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Steven Rostedt <rostedt@goodmis.org>, Jiri Slaby <jirislaby@gmail.com>,
       Li Zefan <lizf@cn.fujitsu.com>, Avi Kivity <avi@redhat.com>,
       Paul Mackerras <paulus@samba.org>, Mike Galbraith <efault@gmx.de>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       Paul Mundt <lethal@linux-sh.org>
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2009/10/24 Jan Kiszka <jan.kiszka@web.de>:
> Since commit 3d53c27d05, KVM uses current->thread.debugregs for
> restoring the host state in case the guest played with breakpoints. We
> need an equivalent interface to restore ptrace breakpoints and all
> others currently in use.
>
> Jan


Well, dr6 is still stored in the current thread.
dr7 has a per cpu variable containing its value.

So what remains is to have a per cpu variable for dr0-3
which is updated when perf schedules in/out a profiled context.
I can do that in a v3.

Thanks.
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