[Qemu-devel] [PATCH v14 4/6] cpus: Add new function topology_supports_topoext

[Babu Moger]

Add new function topology_supports_topoext to verify
if we can support topoext feature. Will be used to enable/disable
topoext feature.

Signed-off-by: Babu Moger <address@hidden>
---
 accel/tcg/user-exec-stub.c |  5 +++++
 cpus.c                     | 13 +++++++++++++
 include/qom/cpu.h          |  9 +++++++++
 3 files changed, 27 insertions(+)

diff --git a/accel/tcg/user-exec-stub.c b/accel/tcg/user-exec-stub.c
index dbcf1ad..715818a 100644
--- a/accel/tcg/user-exec-stub.c
+++ b/accel/tcg/user-exec-stub.c
@@ -11,6 +11,11 @@ void qemu_init_vcpu(CPUState *cpu)
 {
 }
 
+int topology_supports_topoext(int max_cores, int max_threads)
+{
+    return true;
+}
+
 /* User mode emulation does not support record/replay yet.  */
 
 bool replay_exception(void)
diff --git a/cpus.c b/cpus.c
index d1f1629..17f6f4c 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1979,6 +1979,19 @@ static void qemu_dummy_start_vcpu(CPUState *cpu)
                        QEMU_THREAD_JOINABLE);
 }
 
+/*
+ * Check if we can support topoext feature with this topology
+ * Fail if number of cores are beyond the supported cores
+ * or number of threads are more than supported threads
+ */
+int topology_supports_topoext(int max_cores, int max_threads)
+{
+    if ((smp_cores > max_cores) || (smp_threads > max_threads)) {
+        return false;
+    }
+    return true;
+}
+
 void qemu_init_vcpu(CPUState *cpu)
 {
     cpu->nr_cores = smp_cores;
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 9d3afc6..4ac4d49 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -1004,6 +1004,15 @@ void end_exclusive(void);
  */
 void qemu_init_vcpu(CPUState *cpu);
 
+/**
+ * topology_supports_topoext:
+ * @max_cores: Max cores topoext feature can support
+ * @max_threads: Max threads topoext feature can support
+ *
+ * Return true if topology can be supported else return false
+ */
+int topology_supports_topoext(int max_cores, int max_threads);
+
 #define SSTEP_ENABLE  0x1  /* Enable simulated HW single stepping */
 #define SSTEP_NOIRQ   0x2  /* Do not use IRQ while single stepping */
 #define SSTEP_NOTIMER 0x4  /* Do not Timers while single stepping */
-- 
1.8.3.1