From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH 2/2] Add xen-hyp-rw
Date: Thu, 18 Jun 2015 18:05:03 +0100
Message-ID: <5582FA3F.4030108@citrix.com>
References: <1434642932-24807-1-git-send-email-dslutz@verizon.com>
	<1434642932-24807-3-git-send-email-dslutz@verizon.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <1434642932-24807-3-git-send-email-dslutz@verizon.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Don Slutz <dslutz@verizon.com>, xen-devel@lists.xen.org
Cc: Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Tim Deegan <tim@xen.org>, Ian Jackson <ian.jackson@eu.citrix.com>, Don Slutz <don.slutz@gmail.com>, Jan Beulich <jbeulich@suse.com>, Wei Liu <wei.liu2@citrix.com>, Mukesh Rathor <mukesh.rathor@oracle.com>
List-Id: xen-devel@lists.xenproject.org

On 18/06/15 16:55, Don Slutz wrote:
> This allows reading and writing of variables in the hypervisor.
>
> for example (read case -- default 4 bytes):
>
>   xen-hyp-rw /boot/System.map-xen* opt_hvm_debug_level
>   opt_hvm_debug_level @ 0xffff82d080285610 is 0x0(0)
>
> Write case:
>
>   xen-hyp-rw /boot/System.map-xen* opt_hvm_debug_level 4 -1
>   opt_hvm_debug_level @ 0xffff82d080285610 is 0x0(0)
>   opt_hvm_debug_level @ 0xffff82d080285610 set to 0xffffffff(4294967295)
>
> Signed-off-by: Don Slutz <dslutz@verizon.com>
> CC: Don Slutz <don.slutz@gmail.com>

As a crazy thought...

Would it not be easier to modify gdbsx to allow gdb to connect remotely
to the hypervisor context?

That way, any gdb-like tools could consume an appropriate xen-syms and
make changes like this.

~Andrew