Currently, support for exposure of cpu topology to the guest
is only introduced for ARM machines and we also have an ARM
specific parsing function virt_smp_parse(), so we disallow
the "-smp expose=on" configuration for the other platforms.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
---
 hw/core/machine.c | 7 +++++++
 hw/i386/pc.c      | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index 55b9bc7817..23721bb77e 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -746,6 +746,13 @@ static void smp_parse(MachineState *ms, QemuOpts *opts)
         unsigned sockets = qemu_opt_get_number(opts, "sockets", 0);
         unsigned cores   = qemu_opt_get_number(opts, "cores", 0);
         unsigned threads = qemu_opt_get_number(opts, "threads", 0);
+        bool expose      = qemu_opt_get_bool(opts, "expose", false);
+
+        if (expose) {
+            error_report("expose=on: exposing cpu topology to the guest"
+                         "is not supported yet");
+            exit(1);
+        }
 
         /* compute missing values, prefer sockets over cores over threads */
         if (cpus == 0 || sockets == 0) {
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index c6d8d0d84d..afabfa0566 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -720,6 +720,13 @@ void pc_smp_parse(MachineState *ms, QemuOpts *opts)
         unsigned dies = qemu_opt_get_number(opts, "dies", 1);
         unsigned cores   = qemu_opt_get_number(opts, "cores", 0);
         unsigned threads = qemu_opt_get_number(opts, "threads", 0);
+        bool expose      = qemu_opt_get_bool(opts, "expose", false);
+
+        if (expose) {
+            error_report("expose=on: exposing cpu topology to the guest"
+                         "is not supported yet");
+            exit(1);
+        }
 
         /* compute missing values, prefer sockets over cores over threads */
         if (cpus == 0 || sockets == 0) {
-- 
2.23.0