TDX uses CPUID 0x1f to configure TD guest's CPU topology. So set
enable_cpuid_0x1f for TDs.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 target/i386/kvm/tdx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 49e748af3949..b0616eb3d371 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -402,7 +402,11 @@ static int tdx_kvm_type(X86ConfidentialGuest *cg)
 
 static void tdx_cpu_instance_init(X86ConfidentialGuest *cg, CPUState *cpu)
 {
+    X86CPU *x86cpu = X86_CPU(cpu);
+
     object_property_set_bool(OBJECT(cpu), "pmu", false, &error_abort);
+
+    x86cpu->enable_cpuid_0x1f = true;
 }
 
 static int tdx_validate_attributes(TdxGuest *tdx, Error **errp)
-- 
2.34.1

On Tue, Apr 01, 2025 at 09:01:44AM -0400, Xiaoyao Li wrote:
> Date: Tue,  1 Apr 2025 09:01:44 -0400
> From: Xiaoyao Li <xiaoyao.li@intel.com>
> Subject: [PATCH v8 34/55] i386/tdx: Force exposing CPUID 0x1f
> X-Mailer: git-send-email 2.34.1
> 
> TDX uses CPUID 0x1f to configure TD guest's CPU topology. So set
> enable_cpuid_0x1f for TDs.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
>  target/i386/kvm/tdx.c | 4 ++++
>  1 file changed, 4 insertions(+)

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