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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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.


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