i386/tdx: Disable pmu for TD guest

Current KVM doesn't support PMU for TD guest. It returns error if TD is
created with PMU bit being set in attributes.

Disable PMU for TD guest on QEMU side.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>

target/i386/kvm/tdx.c

@@ -496,6 +496,8 @@ int tdx_pre_create_vcpu(CPUState *cpu, Error **errp)
     g_autofree struct kvm_tdx_init_vm *init_vm = NULL;
     int r = 0;
 
+    object_property_set_bool(OBJECT(cpu), "pmu", false, &error_abort);
+
     QEMU_LOCK_GUARD(&tdx_guest->lock);
     if (tdx_guest->initialized) {
         return r;