x86: L2 CAT: implement get value flow.

This patch implements L2 CAT get value interface in domctl.

Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/domctl.c

@@ -1483,6 +1483,13 @@ long arch_do_domctl(
             copyback = true;
             break;
 
+        case XEN_DOMCTL_PSR_CAT_OP_GET_L2_CBM:
+            ret = psr_get_val(d, domctl->u.psr_cat_op.target,
+                              &val32, PSR_CBM_TYPE_L2);
+            domctl->u.psr_cat_op.data = val32;
+            copyback = true;
+            break;
+
         default:
             ret = -EOPNOTSUPP;
             break;

xen/include/public/domctl.h

@@ -1142,6 +1142,7 @@ struct xen_domctl_psr_cat_op {
 #define XEN_DOMCTL_PSR_CAT_OP_SET_L3_DATA    3
 #define XEN_DOMCTL_PSR_CAT_OP_GET_L3_CODE    4
 #define XEN_DOMCTL_PSR_CAT_OP_GET_L3_DATA    5
+#define XEN_DOMCTL_PSR_CAT_OP_GET_L2_CBM     7
     uint32_t cmd;       /* IN: XEN_DOMCTL_PSR_CAT_OP_* */
     uint32_t target;    /* IN */
     uint64_t data;      /* IN/OUT */