[PATCH v4 3/6] libxl: introduce MSR data in libxl_cpuid_policy

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Add a new array field to libxl_cpuid_policy in order to store the MSR
policies.

Adding the MSR data in the libxl_cpuid_policy_list type is done so
that existing users can seamlessly pass MSR features as part of the
CPUID data, without requiring the introduction of a separate
domain_build_info field, and a new set of handlers functions.

Note that support for parsing the old JSON format is kept, as that's
required in order to restore domains or received migrations from
previous tool versions.  Differentiation between the old and the new
formats is done based on whether the contents of the 'cpuid' field is
an array or a map JSON object.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Changes since v3:
 - Keep support for the old json format in the parse function.

Changes since v2:
 - Unconditionally call free().
 - Implement the JSON marshaling functions.
---
 tools/libs/light/libxl_cpuid.c    | 152 ++++++++++++++++++++++++++----
 tools/libs/light/libxl_internal.h |   1 +
 tools/libs/light/libxl_types.idl  |   2 +-
 3 files changed, 138 insertions(+), 17 deletions(-)

diff --git a/tools/libs/light/libxl_cpuid.c b/tools/libs/light/libxl_cpuid.c
index 3c8b2a72c0b8..dd97699bbde7 100644
--- a/tools/libs/light/libxl_cpuid.c
+++ b/tools/libs/light/libxl_cpuid.c
@@ -16,7 +16,7 @@
 
 int libxl__cpuid_policy_is_empty(libxl_cpuid_policy_list *pl)
 {
-    return !libxl_cpuid_policy_list_length(pl);
+    return !*pl || (!libxl_cpuid_policy_list_length(pl) && !(*pl)->msr);
 }
 
 void libxl_cpuid_dispose(libxl_cpuid_policy_list *pl)
@@ -40,6 +40,8 @@ void libxl_cpuid_dispose(libxl_cpuid_policy_list *pl)
         free(policy->cpuid);
     }
 
+    free(policy->msr);
+
     free(policy);
     *pl = NULL;
     return;
@@ -516,7 +518,8 @@ int libxl__cpuid_legacy(libxl_ctx *ctx, uint32_t domid, 
bool restore,
 
     r = xc_cpuid_apply_policy(ctx->xch, domid, restore, NULL, 0,
                               pae, itsc, nested_virt,
-                              info->cpuid ? info->cpuid->cpuid : NULL, NULL);
+                              info->cpuid ? info->cpuid->cpuid : NULL,
+                              info->cpuid ? info->cpuid->msr : NULL);
     if (r)
         LOGEVD(ERROR, -r, domid, "Failed to apply CPUID policy");
 
@@ -528,16 +531,22 @@ static const char *input_names[2] = { "leaf", "subleaf" };
 static const char *policy_names[4] = { "eax", "ebx", "ecx", "edx" };
 /*
  * Aiming for:
- * [
- *     { 'leaf':    'val-eax',
- *       'subleaf': 'val-ecx',
- *       'eax':     'filter',
- *       'ebx':     'filter',
- *       'ecx':     'filter',
- *       'edx':     'filter' },
- *     { 'leaf':    'val-eax', ..., 'eax': 'filter', ... },
- *     ... etc ...
- * ]
+ * {   'cpuid': [
+ *              { 'leaf':    'val-eax',
+ *                'subleaf': 'val-ecx',
+ *                'eax':     'filter',
+ *                'ebx':     'filter',
+ *                'ecx':     'filter',
+ *                'edx':     'filter' },
+ *              { 'leaf':    'val-eax', ..., 'eax': 'filter', ... },
+ *              ... etc ...
+ *     ],
+ *     'msr': [
+ *            { 'index': 'val-index',
+ *              'policy': 'filter', },
+ *              ... etc ...
+ *     ],
+ * }
  */
 
 yajl_gen_status libxl_cpuid_policy_list_gen_json(yajl_gen hand,
@@ -545,9 +554,16 @@ yajl_gen_status libxl_cpuid_policy_list_gen_json(yajl_gen 
hand,
 {
     libxl_cpuid_policy_list policy = *pl;
     struct xc_xend_cpuid *cpuid;
+    const struct xc_msr *msr;
     yajl_gen_status s;
     int i, j;
 
+    s = yajl_gen_map_open(hand);
+    if (s != yajl_gen_status_ok) goto out;
+
+    s = libxl__yajl_gen_asciiz(hand, "cpuid");
+    if (s != yajl_gen_status_ok) goto out;
+
     s = yajl_gen_array_open(hand);
     if (s != yajl_gen_status_ok) goto out;
 
@@ -582,6 +598,39 @@ yajl_gen_status libxl_cpuid_policy_list_gen_json(yajl_gen 
hand,
 
 empty:
     s = yajl_gen_array_close(hand);
+    if (s != yajl_gen_status_ok) goto out;
+
+    s = libxl__yajl_gen_asciiz(hand, "msr");
+    if (s != yajl_gen_status_ok) goto out;
+
+    s = yajl_gen_array_open(hand);
+    if (s != yajl_gen_status_ok) goto out;
+
+    if (!policy || !policy->msr) goto done;
+    msr = policy->msr;
+
+    for (i = 0; msr[i].index != XC_MSR_INPUT_UNUSED; i++) {
+        s = yajl_gen_map_open(hand);
+        if (s != yajl_gen_status_ok) goto out;
+
+        s = libxl__yajl_gen_asciiz(hand, "index");
+        if (s != yajl_gen_status_ok) goto out;
+        s = yajl_gen_integer(hand, msr[i].index);
+        if (s != yajl_gen_status_ok) goto out;
+        s = libxl__yajl_gen_asciiz(hand, "policy");
+        if (s != yajl_gen_status_ok) goto out;
+        s = yajl_gen_string(hand,
+                            (const unsigned char *)msr[i].policy, 64);
+        if (s != yajl_gen_status_ok) goto out;
+
+        s = yajl_gen_map_close(hand);
+        if (s != yajl_gen_status_ok) goto out;
+    }
+
+done:
+    s = yajl_gen_array_close(hand);
+    if (s != yajl_gen_status_ok) goto out;
+    s = yajl_gen_map_close(hand);
 out:
     return s;
 }
@@ -592,17 +641,32 @@ int libxl__cpuid_policy_list_parse_json(libxl__gc *gc,
 {
     int i, size;
     struct xc_xend_cpuid *l;
+    struct xc_msr *msr;
+    const libxl__json_object *co;
     flexarray_t *array;
+    bool cpuid_only = false;
+
+    if (libxl__json_object_is_array(o)) {
+        co = o;
+        cpuid_only = true;
+        goto parse_cpuid;
+    }
+
+    if (!libxl__json_object_is_map(o))
+        return ERROR_FAIL;
 
-    if (!libxl__json_object_is_array(o))
+    co = libxl__json_map_get("cpuid", o, JSON_ARRAY);
+    if (!libxl__json_object_is_array(co))
         return ERROR_FAIL;
 
-    array = libxl__json_object_get_array(o);
+parse_cpuid:
+    *p = libxl__calloc(NOGC, 1, sizeof(**p));
+
+    array = libxl__json_object_get_array(co);
     if (!array->count)
-        return 0;
+        goto cpuid_empty;
 
     size = array->count;
-    *p = libxl__calloc(NOGC, 1, sizeof(**p));
     /* need one extra slot as sentinel */
     l = (*p)->cpuid = libxl__calloc(NOGC, size + 1,
                                     sizeof(struct xc_xend_cpuid));
@@ -641,6 +705,42 @@ int libxl__cpuid_policy_list_parse_json(libxl__gc *gc,
                     libxl__strdup(NOGC, libxl__json_object_get_string(r));
         }
     }
+    if (cpuid_only)
+        return 0;
+
+cpuid_empty:
+    co = libxl__json_map_get("msr", o, JSON_ARRAY);
+    if (!libxl__json_object_is_array(co))
+        return ERROR_FAIL;
+
+    array = libxl__json_object_get_array(co);
+    if (!array->count)
+        return 0;
+    size = array->count;
+    /* need one extra slot as sentinel */
+    msr = (*p)->msr = libxl__calloc(NOGC, size + 1, sizeof(struct xc_msr));
+
+    msr[size].index = XC_MSR_INPUT_UNUSED;
+
+    for (i = 0; i < size; i++) {
+        const libxl__json_object *t, *r;
+
+        if (flexarray_get(array, i, (void**)&t) != 0)
+            return ERROR_FAIL;
+
+        if (!libxl__json_object_is_map(t))
+            return ERROR_FAIL;
+
+        r = libxl__json_map_get("index", t, JSON_INTEGER);
+        if (!r) return ERROR_FAIL;
+        msr[i].index = libxl__json_object_get_integer(r);
+        r = libxl__json_map_get("policy", t, JSON_STRING);
+        if (!r) return ERROR_FAIL;
+        if (strlen(libxl__json_object_get_string(r)) !=
+            ARRAY_SIZE(msr[i].policy) - 1)
+            return ERROR_FAIL;
+        strcpy(msr[i].policy, libxl__json_object_get_string(r));
+    }
 
     return 0;
 }
@@ -677,6 +777,10 @@ void libxl_cpuid_policy_list_copy(libxl_ctx *ctx,
     }
 
     *pdst = libxl__calloc(NOGC, 1, sizeof(**pdst));
+
+    if (!(*psrc)->cpuid)
+        goto copy_msr;
+
     dst = &(*pdst)->cpuid;
     src = &(*psrc)->cpuid;
     len = libxl_cpuid_policy_list_length(psrc);
@@ -696,6 +800,22 @@ void libxl_cpuid_policy_list_copy(libxl_ctx *ctx,
                 (*dst)[i].policy[j] = NULL;
     }
 
+copy_msr:
+    if ((*psrc)->msr) {
+        const struct xc_msr *msr = (*psrc)->msr;
+
+        for (i = 0; msr[i].index != XC_MSR_INPUT_UNUSED; i++)
+            ;
+        len = i;
+        (*pdst)->msr = libxl__calloc(NOGC, len + 1, sizeof(struct xc_msr));
+        (*pdst)->msr[len].index = XC_MSR_INPUT_UNUSED;
+
+        for (i = 0; i < len; i++) {
+            (*pdst)->msr[i].index = msr[i].index;
+            strcpy((*pdst)->msr[i].policy, msr[i].policy);
+        }
+    }
+
 out:
     GC_FREE;
 }
diff --git a/tools/libs/light/libxl_internal.h 
b/tools/libs/light/libxl_internal.h
index ef882cff3912..b1a7cd9f615b 100644
--- a/tools/libs/light/libxl_internal.h
+++ b/tools/libs/light/libxl_internal.h
@@ -4871,6 +4871,7 @@ _hidden int libxl__domain_set_paging_mempool_size(
 
 struct libxl__cpu_policy {
     struct xc_xend_cpuid *cpuid;
+    struct xc_msr *msr;
 };
 
 #endif
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index 9e48bb772646..fd2f3f6e485f 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -19,7 +19,7 @@ libxl_mac = Builtin("mac", json_parse_type="JSON_STRING", 
passby=PASS_BY_REFEREN
 libxl_bitmap = Builtin("bitmap", json_parse_type="JSON_ARRAY", 
dispose_fn="libxl_bitmap_dispose", passby=PASS_BY_REFERENCE,
                        check_default_fn="libxl_bitmap_is_empty", 
copy_fn="libxl_bitmap_copy_alloc")
 libxl_cpuid_policy_list = Builtin("cpuid_policy_list", 
dispose_fn="libxl_cpuid_dispose", passby=PASS_BY_REFERENCE,
-                                  json_parse_type="JSON_ARRAY", 
check_default_fn="libxl__cpuid_policy_is_empty",
+                                  json_parse_type="JSON_ANY", 
check_default_fn="libxl__cpuid_policy_is_empty",
                                   copy_fn="libxl_cpuid_policy_list_copy")
 
 libxl_string_list = Builtin("string_list", 
dispose_fn="libxl_string_list_dispose", passby=PASS_BY_REFERENCE,
-- 
2.41.0