[PATCH v1 36/40] i386/tdx: Don't synchronize guest tsc for TDs

Xiaoyao Li
2022-08-02T07:51:10Z

From: Isaku Yamahata <isaku.yamahata@intel.com>

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@intel.com>
Reviewed-by: Connor Kuehl <ckuehl@redhat.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
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 8c282122ed67..8999f64eeaf1 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -270,7 +270,7 @@ 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