Re: [PATCH 0/4] CPU hotplug port from qemu-traditionnal to qemu-xen for 4.3.

From: Ian Campbell <Ian.Campbell@citrix.com>
To: Anthony PERARD <anthony.perard@citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@citrix.com>,
	Xen Devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH 0/4] CPU hotplug port from qemu-traditionnal to qemu-xen for 4.3.
Date: Mon, 3 Jun 2013 09:41:48 +0100	[thread overview]
Message-ID: <1370248908.404.11.camel@zakaz.uk.xensource.com> (raw)
In-Reply-To: <1370017993-13437-1-git-send-email-anthony.perard@citrix.com>

On Fri, 2013-05-31 at 17:33 +0100, Anthony PERARD wrote:
> Hi all,
> 
> This series ports few patches from qemu-xen-traditionnal to qemu-xen
> (upstream). There is as little modification as possible on those patches so
> they *can not* be upstream as is. So this is only for 4.3. A proper series will
> be done for 4.4.
> 
> There make possible to have CPU hotplug on qemu-xen.
> 
> A patch for libxl will follow, which make use of the old command line
> -vcpu_avail with qemu-xen. This command line will probably not be upstream.
> 
> BUG: There is an issue with SeaBIOS (used with qemu-xen). At SMP
> initialisation, SeaBIOS will count the number of CPU running, and the number is
> always equal to maxvcpu when SeaBIOS expect less. This happen when we have
> something like:
> vcpus = 2
> maxvcpus = 8
> in the VM config file. Linux is fine with this and will use only $vcpus.  So
> the probleme is: an infinit loop in SeaBIOS.

I'm a bit confused -- if SeaBIOS has an infinite loop how do you even
get to know Linux is OK?

Do you have a fix for SeaBIOS, I don't see it in this series.

Ian.