diff mbox series

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

Message ID 20220512031803.3315890-33-xiaoyao.li@intel.com (mailing list archive)
State New, archived
Headers show
Series TDX QEMU support | expand

Commit Message

Xiaoyao Li May 12, 2022, 3:17 a.m. UTC 
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(-)

Comments

Gerd Hoffmann May 24, 2022, 8:04 a.m. UTC | #1 
On Thu, May 12, 2022 at 11:17:59AM +0800, Xiaoyao Li wrote:
> 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>

Acked-by: Gerd Hoffmann <kraxel@redhat.com>
diff mbox series

Patch

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);
         }