linux-kernel - [PATCH v2 15/21] KVM:x86: Report CET MSRs as to-be-saved if CET is supported

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Date:   Fri, 21 Apr 2023 09:46:09 -0400
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, peterz@...radead.org,
        john.allen@....com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     rick.p.edgecombe@...el.com, weijiang.yang@...el.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH v2 15/21] 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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7cd7f6755acd..95dba3c3df5f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1470,6 +1470,7 @@ static const u32 msrs_to_save_base[] = {
 
 	MSR_IA32_XFD, MSR_IA32_XFD_ERR,
 	MSR_IA32_XSS,
+	MSR_IA32_U_CET, MSR_IA32_PL3_SSP, MSR_KVM_GUEST_SSP,
 };
 
 static const u32 msrs_to_save_pmu[] = {
-- 
2.27.0