kvm: add support for boolean statistics

The next version of Linux will introduce boolean statistics, which
can only have 0 or 1 values.  Convert them to the new QAPI fields
added in the previous commit.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

accel/kvm/kvm-all.c

@@ -3743,6 +3743,7 @@ static StatsList *add_kvmstat_entry(struct kvm_stats_desc *pdesc,
     case KVM_STATS_UNIT_BYTES:
     case KVM_STATS_UNIT_CYCLES:
     case KVM_STATS_UNIT_SECONDS:
+    case KVM_STATS_UNIT_BOOLEAN:
         break;
     default:
         return stats_list;
@@ -3761,7 +3762,10 @@ static StatsList *add_kvmstat_entry(struct kvm_stats_desc *pdesc,
     stats->name = g_strdup(pdesc->name);
     stats->value = g_new0(StatsValue, 1);;
 
-    if (pdesc->size == 1) {
+    if ((pdesc->flags & KVM_STATS_UNIT_MASK) == KVM_STATS_UNIT_BOOLEAN) {
+        stats->value->u.boolean = *stats_data;
+        stats->value->type = QTYPE_QBOOL;
+    } else if (pdesc->size == 1) {
         stats->value->u.scalar = *stats_data;
         stats->value->type = QTYPE_QNUM;
     } else {
@@ -3809,6 +3813,10 @@ static StatsSchemaValueList *add_kvmschema_entry(struct kvm_stats_desc *pdesc,
     switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
     case KVM_STATS_UNIT_NONE:
         break;
+    case KVM_STATS_UNIT_BOOLEAN:
+        schema_entry->value->has_unit = true;
+        schema_entry->value->unit = STATS_UNIT_BOOLEAN;
+        break;
     case KVM_STATS_UNIT_BYTES:
         schema_entry->value->has_unit = true;
         schema_entry->value->unit = STATS_UNIT_BYTES;

linux-headers/linux/kvm.h

@@ -2031,6 +2031,7 @@ struct kvm_stats_header {
 #define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
 #define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
 #define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_BOOLEAN		(0x4 << KVM_STATS_UNIT_SHIFT)
 #define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
 
 #define KVM_STATS_BASE_SHIFT		8