[PATCH v15 09/14] KVM: x86: Report CET MSRs as to-be-saved if CET is supported

[Yang Weijiang]

Report all CET MSRs, including the synthetic GUEST_SSP MSR, as
to-be-saved, e.g. for migration, if CET is supported by KVM.

Co-developed-by: Sean Christopherson <sean.j.christopher...@intel.com>
Signed-off-by: Sean Christopherson <sean.j.christopher...@intel.com>
Signed-off-by: Yang Weijiang <weijiang.y...@intel.com>
---
 arch/x86/kvm/x86.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6af240d87a33..059e101daf94 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1266,6 +1266,8 @@ static const u32 msrs_to_save_all[] = {
        MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
 
        MSR_IA32_XSS,
+       MSR_IA32_U_CET, MSR_IA32_S_CET, MSR_IA32_INT_SSP_TAB, MSR_KVM_GUEST_SSP,
+       MSR_IA32_PL0_SSP, MSR_IA32_PL1_SSP, MSR_IA32_PL2_SSP, MSR_IA32_PL3_SSP,
 };
 
 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
@@ -5828,6 +5830,14 @@ static void kvm_init_msr_list(void)
                        if (!supported_xss)
                                continue;
                        break;
+               case MSR_KVM_GUEST_SSP:
+               case MSR_IA32_U_CET:
+               case MSR_IA32_S_CET:
+               case MSR_IA32_INT_SSP_TAB:
+               case MSR_IA32_PL0_SSP ... MSR_IA32_PL3_SSP:
+                       if (!kvm_cet_supported())
+                               continue;
+                       break;
                default:
                        break;
                }
-- 
2.26.2