x86: L2 CAT: implement set value flow.

This patch implements L2 CAT set value related callback function
and domctl interface.

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

xen/arch/x86/domctl.c

@@ -1462,6 +1462,12 @@ long arch_do_domctl(
                               PSR_CBM_TYPE_L3_DATA);
             break;
 
+        case XEN_DOMCTL_PSR_CAT_OP_SET_L2_CBM:
+            ret = psr_set_val(d, domctl->u.psr_cat_op.target,
+                              domctl->u.psr_cat_op.data,
+                              PSR_CBM_TYPE_L2);
+            break;
+
         case XEN_DOMCTL_PSR_CAT_OP_GET_L3_CBM:
             ret = psr_get_val(d, domctl->u.psr_cat_op.target,
                               &val32, PSR_CBM_TYPE_L3);

xen/arch/x86/psr.c

@@ -408,6 +408,7 @@ static const struct feat_props l3_cdp_props = {
 /* L2 CAT props */
 static void l2_cat_write_msr(unsigned int cos, uint32_t val, enum cbm_type type)
 {
+    wrmsrl(MSR_IA32_PSR_L2_MASK(cos), val);
 }
 
 static const struct feat_props l2_cat_props = {

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_SET_L2_CBM     6
 #define XEN_DOMCTL_PSR_CAT_OP_GET_L2_CBM     7
     uint32_t cmd;       /* IN: XEN_DOMCTL_PSR_CAT_OP_* */
     uint32_t target;    /* IN */