[RFC PATCH v4 33/36] i386/tdx: Only configure MSR_IA32_UCODE_REV in kvm_init_msrs() for TDs

[Xiaoyao Li]

For TDs, only MSR_IA32_UCODE_REV in kvm_init_msrs() can be configured
by VMM, while the features enumerated/controlled by other MSRs except
MSR_IA32_UCODE_REV in kvm_init_msrs() are not under control of VMM.

Only configure MSR_IA32_UCODE_REV for TDs.

Signed-off-by: Xiaoyao Li <xiaoyao...@intel.com>
---
 target/i386/kvm/kvm.c | 44 ++++++++++++++++++++++---------------------
 1 file changed, 23 insertions(+), 21 deletions(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index c79dbff747e8..9c5bf075b542 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -3125,32 +3125,34 @@ static void kvm_init_msrs(X86CPU *cpu)
     CPUX86State *env = &cpu->env;
 
     kvm_msr_buf_reset(cpu);
-    if (has_msr_arch_capabs) {
-        kvm_msr_entry_add(cpu, MSR_IA32_ARCH_CAPABILITIES,
-                          env->features[FEAT_ARCH_CAPABILITIES]);
-    }
-
-    if (has_msr_core_capabs) {
-        kvm_msr_entry_add(cpu, MSR_IA32_CORE_CAPABILITY,
-                          env->features[FEAT_CORE_CAPABILITY]);
-    }
-
-    if (has_msr_perf_capabs && cpu->enable_pmu) {
-        kvm_msr_entry_add_perf(cpu, env->features);
+
+    if (!is_tdx_vm()) {
+        if (has_msr_arch_capabs) {
+            kvm_msr_entry_add(cpu, MSR_IA32_ARCH_CAPABILITIES,
+                                env->features[FEAT_ARCH_CAPABILITIES]);
+        }
+
+        if (has_msr_core_capabs) {
+            kvm_msr_entry_add(cpu, MSR_IA32_CORE_CAPABILITY,
+                                env->features[FEAT_CORE_CAPABILITY]);
+        }
+
+        if (has_msr_perf_capabs && cpu->enable_pmu) {
+            kvm_msr_entry_add_perf(cpu, env->features);
+        }
+
+        /*
+         * Older kernels do not include VMX MSRs in KVM_GET_MSR_INDEX_LIST, but
+         * all kernels with MSR features should have them.
+         */
+        if (kvm_feature_msrs && cpu_has_vmx(env)) {
+            kvm_msr_entry_add_vmx(cpu, env->features);
+        }
     }
 
     if (has_msr_ucode_rev) {
         kvm_msr_entry_add(cpu, MSR_IA32_UCODE_REV, cpu->ucode_rev);
     }
-
-    /*
-     * Older kernels do not include VMX MSRs in KVM_GET_MSR_INDEX_LIST, but
-     * all kernels with MSR features should have them.
-     */
-    if (kvm_feature_msrs && cpu_has_vmx(env)) {
-        kvm_msr_entry_add_vmx(cpu, env->features);
-    }
-
     assert(kvm_buf_set_msrs(cpu) == 0);
 }
 
-- 
2.27.0