linux-kernel - [PATCH v14 09/13] KVM: x86: Report CET MSRs as to-be-saved if CET is supported

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Date:   Fri,  6 Nov 2020 09:16:33 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, sean.j.christopherson@...el.com,
        jmattson@...gle.com
Cc:     yu.c.zhang@...ux.intel.com, Yang Weijiang <weijiang.yang@...el.com>
Subject: [PATCH v14 09/13] KVM: x86: Report CET MSRs as to-be-saved if CET is supported

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.christopherson@...el.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
 arch/x86/kvm/x86.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 751b62e871e5..d573cadf5baf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1248,6 +1248,8 @@ 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)];
@@ -5761,6 +5763,13 @@ static void kvm_init_msr_list(void)
 			if (!supported_xss)
 				continue;
 			break;
+		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;
 		}
-- 
2.17.2