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Date:	Mon, 26 Oct 2009 09:17:31 +0100
From:	Jan Kiszka <>
To:	Frederic Weisbecker <>
CC:	Ingo Molnar <>, LKML <>,
	Prasad <>,
	Alan Stern <>,
	Peter Zijlstra <>,
	Arnaldo Carvalho de Melo <>,
	Steven Rostedt <>,
	Jiri Slaby <>,
	Li Zefan <>, Avi Kivity <>,
	Paul Mackerras <>,
	Mike Galbraith <>,
	Masami Hiramatsu <>,
	Paul Mundt <>
Subject: Re: [PATCH 4/6] hw-breakpoints: Rewrite the hw-breakpoints layer
 on 	top of perf events

Frederic Weisbecker wrote:
> 2009/10/24 Jan Kiszka <>:
>> 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.

Sounds great. Maybe you can stuff all this into some function kvm can
call to avoid that it has to peek into various internal structures.


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