libxc: get and set soft and hard affinity

by using the flag and the new cpumap arguments introduced in
the parameters of the DOMCTL_{get,set}_vcpuaffinity hypercalls.

Now, both xc_vcpu_setaffinity() and xc_vcpu_getaffinity() have
a new flag parameter, to specify whether the user wants to
set/get hard affinity, soft affinity or both. They also have
two cpumap parameters instead of only one. This way, it is
possible to set/get both hard and soft affinity at the same
time (and, in case of set, each one to its own value).

In xc_vcpu_setaffinity(), the cpumaps are IN/OUT parameters,
as it is for the corresponding arguments of the
DOMCTL_set_vcpuaffinity hypercall. What Xen puts there is the
hard and soft effective affinity, that is what Xen will actually
use for scheduling.

In-tree callers are also fixed to cope with the new interface.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/python/xen/lowlevel/xc/xc.c

@@ -256,7 +256,8 @@ static PyObject *pyxc_vcpu_setaffinity(XcObject *self,
         }
     }
   
-    if ( xc_vcpu_setaffinity(self->xc_handle, dom, vcpu, cpumap) != 0 )
+    if ( xc_vcpu_setaffinity(self->xc_handle, dom, vcpu, cpumap,
+                             NULL, XEN_VCPUAFFINITY_HARD) != 0 )
     {
         free(cpumap);
         return pyxc_error_to_exception(self->xc_handle);
@@ -403,7 +404,8 @@ static PyObject *pyxc_vcpu_getinfo(XcObject *self,
     if(cpumap == NULL)
         return pyxc_error_to_exception(self->xc_handle);
 
-    rc = xc_vcpu_getaffinity(self->xc_handle, dom, vcpu, cpumap);
+    rc = xc_vcpu_getaffinity(self->xc_handle, dom, vcpu, cpumap,
+                             NULL, XEN_VCPUAFFINITY_HARD);
     if ( rc < 0 )
     {
         free(cpumap);