[RFC PATCH v4 32/36] i386/tdx: Don't synchronize guest tsc for TDs

[Xiaoyao Li <xiaoyao.li@xxxxxxxxx>]

From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

TSC of TDs is not accessible and KVM doesn't allow access of
MSR_IA32_TSC for TDs. To avoid the assert() in kvm_get_tsc, make
kvm_synchronize_all_tsc() noop for TDs,

Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Reviewed-by: Connor Kuehl <ckuehl@xxxxxxxxxx>
Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
 target/i386/kvm/kvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 9a1e1dab938f..c79dbff747e8 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -276,7 +276,7 @@ void kvm_synchronize_all_tsc(void)
 {
     CPUState *cpu;
 
-    if (kvm_enabled()) {
+    if (kvm_enabled() && !is_tdx_vm()) {
         CPU_FOREACH(cpu) {
             run_on_cpu(cpu, do_kvm_synchronize_tsc, RUN_ON_CPU_NULL);
         }
-- 
2.27.0