Because it's fixed1 bit that enforced by TDX module.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 target/i386/kvm/tdx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index cd8e96d476b8..8f075ba5a4de 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -740,6 +740,9 @@ static void tdx_cpu_instance_init(X86ConfidentialGuest *cg, CPUState *cpu)
 
     object_property_set_bool(OBJECT(cpu), "pmu", false, &error_abort);
 
+    /* invtsc is fixed1 for TD guest */
+    object_property_set_bool(OBJECT(cpu), "invtsc", true, &error_abort);
+
     x86cpu->enable_cpuid_0x1f = true;
 }
 
-- 
2.34.1

On Tue, Apr 01, 2025 at 09:02:03AM -0400, Xiaoyao Li wrote:
> Date: Tue,  1 Apr 2025 09:02:03 -0400
> From: Xiaoyao Li <xiaoyao.li@intel.com>
> Subject: [PATCH v8 53/55] i386/tdx: Make invtsc default on
> X-Mailer: git-send-email 2.34.1
> 
> Because it's fixed1 bit that enforced by TDX module.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
>  target/i386/kvm/tdx.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>