From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matt Wilson <msw@amazon.com>
Subject: Re: Xen 4.2 Release Plan / TODO
Date: Tue, 26 Jun 2012 13:31:51 -0700
Message-ID: <20120626203151.GA8676@US-SEA-R8XVZTX>
References: <1340699982.3832.28.camel@zakaz.uk.xensource.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
Content-Disposition: inline
In-Reply-To: <1340699982.3832.28.camel@zakaz.uk.xensource.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: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

On Tue, Jun 26, 2012 at 01:39:42AM -0700, Ian Campbell wrote:
>     * [BUG] vcpu-set doesn't take effect on guest, reported by Intel:
>       http://bugzilla.xen.org/bugzilla/show_bug.cgi?id=1822

This may be a problem with the guest, rather than a problem with Xen
or the toolstack. I tested on a domU running a 3.2.20-based Linux
kernel. The domU kernel didn't automatically enable the vCPUs after
calling "xl vcpu-set" to increase the allocation.

# xl list 2
Name                                        ID   Mem VCPUs      State Time(s)
test                                         2 15360     1     -b---- 6617.6
# xl vcpu-set 2 4
# xl list 2
Name                                        ID   Mem VCPUs      State Time(s)
test                                         2 15360     1     -b---- 6617.7

But when I hotplugged the CPUs on the domU side with

  for online in /sys/devices/system/cpu/cpu*/online; do
      echo 1 > $online
  done

Now we see:

# xl list 2
Name                                        ID   Mem VCPUs      State Time(s)
test                                         2 15360     4     -b---- 6617.8

I've added this as a comment to the bugzilla.

Matt