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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 31 May 2013, 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.

Is a patch coming for that?



> 
> Ian Jackson (4):
>   HVM vcpu add/remove: qemu logic for vcpu add/revmoe
>   Fix vcpu hotplug bug: get correct vcpu_avail bitmap
>   Update vcpu hotplug logic
>   Implement 'xm vcpu-set' command for HVM guest
> 
>  hmp-commands.hx |  9 ++++++
>  hw/acpi_piix4.c | 88 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  monitor.c       | 18 ++++++++++++
>  qemu-options.hx |  3 ++
>  sysemu.h        |  4 +++
>  vl.c            | 55 ++++++++++++++++++++++++++++++++++++
>  xen-all.c       | 65 ++++++++++++++++++++++++++++++++++++++++++
>  7 files changed, 241 insertions(+), 1 deletion(-)
> 
> -- 
> Anthony PERARD
> 

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