[v4,4/9] hw/core: Check smp cache topology support for machine

Commit Message

Zhao Liu Oct. 22, 2024, 1:51 p.m. UTC

Add cache_supported flags in SMPCompatProps to allow machines to
configure various caches support.

And check the compatibility of the cache properties with the
machine support in machine_parse_smp_cache().

Signed-off-by: Zhao Liu <[e-mail]>
Tested-by: Yongwei Ma <[e-mail]>
Reviewed-by: Jonathan Cameron <[e-mail]>
---
Changes since Patch v3:
 * Dropped cache level check because if some fields is marked as
   default, then we can't guarentee the hierarchies are correct.
   (Daniel)
---
 hw/core/machine-smp.c | 41 +++++++++++++++++++++++++++++++++++++++++
 include/hw/boards.h   |  3 +++
 2 files changed, 44 insertions(+)

Patch

diff --git a/hw/core/machine-smp.c b/hw/core/machine-smp.c
index c6d90cd6d413..ebb7a134a7be 100644
--- a/hw/core/machine-smp.c
+++ b/hw/core/machine-smp.c
@@ -261,10 +261,32 @@  void machine_parse_smp_config(MachineState *ms,
     }
 }
 
+static bool machine_check_topo_support(MachineState *ms,
+                                       CpuTopologyLevel topo,
+                                       Error **errp)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(ms);
+
+    if ((topo == CPU_TOPOLOGY_LEVEL_MODULE && !mc->smp_props.modules_supported) ||
+        (topo == CPU_TOPOLOGY_LEVEL_CLUSTER && !mc->smp_props.clusters_supported) ||
+        (topo == CPU_TOPOLOGY_LEVEL_DIE && !mc->smp_props.dies_supported) ||
+        (topo == CPU_TOPOLOGY_LEVEL_BOOK && !mc->smp_props.books_supported) ||
+        (topo == CPU_TOPOLOGY_LEVEL_DRAWER && !mc->smp_props.drawers_supported)) {
+        error_setg(errp,
+                   "Invalid topology level: %s. "
+                   "The topology level is not supported by this machine",
+                   CpuTopologyLevel_str(topo));
+        return false;
+    }
+
+    return true;
+}
+
 bool machine_parse_smp_cache(MachineState *ms,
                              const SmpCachePropertiesList *caches,
                              Error **errp)
 {
+    MachineClass *mc = MACHINE_GET_CLASS(ms);
     const SmpCachePropertiesList *node;
     DECLARE_BITMAP(caches_bitmap, CACHE_LEVEL_AND_TYPE__MAX);
 
@@ -283,6 +305,25 @@  bool machine_parse_smp_cache(MachineState *ms,
         set_bit(node->value->cache, caches_bitmap);
     }
 
+    for (int i = 0; i < CACHE_LEVEL_AND_TYPE__MAX; i++) {
+        const SmpCacheProperties *props = &ms->smp_cache.props[i];
+
+        /*
+         * Reject non "default" topology level if the cache isn't
+         * supported by the machine.
+         */
+        if (props->topology != CPU_TOPOLOGY_LEVEL_DEFAULT &&
+            !mc->smp_props.cache_supported[props->cache]) {
+            error_setg(errp,
+                       "%s cache topology not supported by this machine",
+                       CacheLevelAndType_str(node->value->cache));
+            return false;
+        }
+
+        if (!machine_check_topo_support(ms, props->topology, errp)) {
+            return false;
+        }
+    }
     return true;
 }
 
diff --git a/include/hw/boards.h b/include/hw/boards.h
index f7591d54a3d3..3d6cb5acd6c7 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -153,6 +153,8 @@  typedef struct {
  * @books_supported - whether books are supported by the machine
  * @drawers_supported - whether drawers are supported by the machine
  * @modules_supported - whether modules are supported by the machine
+ * @cache_supported - whether cache (l1d, l1i, l2 and l3) configuration are
+ *                    supported by the machine
  */
 typedef struct {
     bool prefer_sockets;
@@ -162,6 +164,7 @@  typedef struct {
     bool books_supported;
     bool drawers_supported;
     bool modules_supported;
+    bool cache_supported[CACHE_LEVEL_AND_TYPE__MAX];
 } SMPCompatProps;
 
 /**