[libvirt] [PATCH 2/4] vcpupin: add reset option to virsh vcpupin command

[Daniel Veillard]

On Fri, Jun 10, 2011 at 03:39:38PM +0900, Taku Izumi wrote:
> 
> When resetting vcpupin setting, we have to specify all host physical
> cpus as a cpulist parameter of virsh vcpupin command. It's a little
> tedious.
> 
> This patch changes to allow to receive the special keyword 'r' as a cpulist
> parameter of virsh vcpupin command when resetting vcpupin setting.
> 
> If you set the following:
> 
>  # virsh vcpupin VM 0 r
> 
> the vcpu0 will be pinned to all physical cpus.
> 
> 
> Signed-off-by: Taku Izumi <izumi.taku at jp.fujitsu.com>
> ---
>  tools/virsh.c   |    7 ++++++-
>  tools/virsh.pod |    2 ++
>  2 files changed, 8 insertions(+), 1 deletion(-)
> 
> Index: libvirt/tools/virsh.c
> ===================================================================
> --- libvirt.orig/tools/virsh.c
> +++ libvirt/tools/virsh.c
> @@ -3010,8 +3010,13 @@ cmdVcpupin(vshControl *ctl, const vshCmd
>  
>      /* Parse cpulist */
>      cur = cpulist;
> -    if (*cur == 0)
> +    if (*cur == 0) {
>          goto parse_error;
> +    } else if (*cur == 'r') {
> +        for (cpu = 0; cpu < maxcpu; cpu++)
> +            VIR_USE_CPU(cpumap, cpu);
> +        *cur = 0;
> +    }
>  
>      while (*cur != 0) {
>  
> Index: libvirt/tools/virsh.pod
> ===================================================================
> --- libvirt.orig/tools/virsh.pod
> +++ libvirt/tools/virsh.pod
> @@ -797,6 +797,8 @@ Pin domain VCPUs to host physical CPUs. 
>  and I<cpulist> is a list of physical CPU numbers. Its syntax is a comma
>  separated list and a special markup using '-' and '^' (ex. '0-4', '0-3,^2') can
>  also be allowed. The '-' denotes the range and the '^' denotes exclusive.
> +If you want to reset vcpupin setting, that is, to pin vcpu all physical cpus,
> +simply specify 'r' as a cpulist.
>  If I<--live> is specified, affect a running guest.
>  If I<--config> is specified, affect the next boot of a persistent guest.
>  If I<--current> is specified, affect the current guest state.

  ACK, a simple usability improvement

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
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http://veillard.com/ | virtualization library  http://libvirt.org/