[Xen-devel] [PATCH v10 21/25] x86: L2 CAT: implement set value flow.

[Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>]

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

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
v10:
    - check input data and remove cast in domctl.
      (suggested by Jan Beulich)
    - remove some hooks assignment due to previous patches changes.
      (suggested by Jan Beulich)
    - remove cast in 'l2_cat_write_msr'.
      (suggested by Jan Beulich)
    - remove 'return in 'l2_cat_write_msr'.
      (suggested by Jan Beulich)
v9:
    - reuse some CAT common functions for L2 CAT to reduce redundant codes.
      (suggested by Roger Pau)
    - remove parameter 'found' from 'cat_compare_val' and modify the return
      values to let caller know if the id is found or not. These things are
      done in patch "x86: refactor psr: set value: implement cos finding flow."
      (suggested by Roger Pau and Dario Faggioli)
    - remove 'get_cos_num' related codes.
      (suggested by Jan Beulich)
    - modify 'l2_cat_write_msr' according to previous patch change.
    - changes about 'uint64_t' to 'uint32_t'.
      (suggested by Jan Beulich)
v8:
    - modify 'l2_cat_write_msr' to 'void'.
v5:
    - remove type check in callback function.
      (suggested by Jan Beulich)
    - modify return value of callback functions because we do not need them
      to return number of entries the feature uses. In caller, we call
      'get_cos_num' to get the number of entries the feature uses.
      (suggested by Jan Beulich)
    - remove 'l2_cat_get_cos_max_from_type'.
      (suggested by Jan Beulich)
    - rename 'l2_cat_exceeds_cos_max' to 'l2_cat_fits_cos_max'.
      (suggested by Jan Beulich)
v4:
    - create this patch because of codes architecture change.
      (suggested by Jan Beulich)
---
 xen/arch/x86/domctl.c       | 10 ++++++++++
 xen/arch/x86/psr.c          | 11 +++++++++++
 xen/include/public/domctl.h |  1 +
 3 files changed, 22 insertions(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 59d472c..7eb5983 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -1466,6 +1466,16 @@ long arch_do_domctl(
                               PSR_CBM_TYPE_L3_DATA);
             break;
 
+        case XEN_DOMCTL_PSR_CAT_OP_SET_L2_CBM:
+            if ( domctl->u.psr_cat_op.data !=
+                 (uint32_t)domctl->u.psr_cat_op.data )
+                return -EINVAL;
+
+            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:
         {
             uint32_t val;
diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 426d725..a85ea99 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -467,10 +467,21 @@ static struct feat_props l3_cdp_props = {
 };
 
 /* L2 CAT ops */
+static void l2_cat_write_msr(unsigned int cos, uint32_t val,
+                             enum cbm_type type, struct feat_node *feat)
+{
+    if ( feat->cos_reg_val[cos] != val )
+    {
+        feat->cos_reg_val[cos] = val;
+        wrmsrl(MSR_IA32_PSR_L2_MASK(cos), val);
+    }
+}
+
 static struct feat_props l2_cat_props = {
     .cos_num = 1,
     .get_feat_info = cat_get_feat_info,
     .get_val = cat_get_val,
+    .write_msr = l2_cat_write_msr,
 };
 
 static void __init parse_psr_bool(char *s, char *value, char *feature,
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 8c183ba..523a2cd 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -1138,6 +1138,7 @@ 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 */
-- 
1.9.1


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