From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Hajnoczi <stefanha@gmail.com>
Subject: Re: Mapping guest memory from another process?
Date: Mon, 9 Sep 2013 11:33:44 +0200
Message-ID: <20130909093344.GD16629@stefanha-thinkpad.redhat.com>
References: <CAG4Ohu_ZxZodnVpA=ym0WdM++Bdhwkx8MUg69aQHG8kOfTUB=A@mail.gmail.com>
 <CAG4Ohu9qjiwycQrRmoC3gq5o-s-aASh_+-gnZdEmCjvFQcoGcg@mail.gmail.com>
 <20130904084746.GA9654@stefanha-thinkpad.redhat.com>
 <CAG4Ohu-6Rksa3UgirBAKBEuWst6gG2yc4EUWebfn2U=MU9FwnA@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: kvm@vger.kernel.org
To: Cutter 409 <cutter409@gmail.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mail-ee0-f41.google.com ([74.125.83.41]:56650 "EHLO
	mail-ee0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751073Ab3IIJds (ORCPT <rfc822;kvm@vger.kernel.org>);
	Mon, 9 Sep 2013 05:33:48 -0400
Received: by mail-ee0-f41.google.com with SMTP id d17so3032256eek.0
        for <kvm@vger.kernel.org>; Mon, 09 Sep 2013 02:33:47 -0700 (PDT)
Content-Disposition: inline
In-Reply-To: <CAG4Ohu-6Rksa3UgirBAKBEuWst6gG2yc4EUWebfn2U=MU9FwnA@mail.gmail.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

On Wed, Sep 04, 2013 at 10:35:56AM -0400, Cutter 409 wrote:
> Thanks, I'll try that. Do you know of any way to get at the VCPU structure
> from another process? I'm looking to have an event triggered from the guest
> which will notify my application. In Xen I use an event channel, and then I
> can call a function to retrieve the relevant VCPU context.

At this point it might be worthwhile to describe what you're trying to
achieve.

I can think of two ways to get vcpu state from a third process: QMP
monitor or kvm.ko file descriptors.  (Ignoring the possibility of using
the gdbstub.)

But the cleanest and best way depends on what exactly you are trying to
do.

Stefan