linux-kernel - [PATCH 02/15] KVM: x86: Report XSS as an MSR to be saved if there are supported features

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Date:   Wed, 31 Aug 2022 18:34:25 -0400
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, kvm@...r.kernel.org
Cc:     like.xu.linux@...il.com, kan.liang@...ux.intel.com,
        wei.w.wang@...el.com, linux-kernel@...r.kernel.org
Subject: [PATCH 02/15] KVM: x86: Report XSS as an MSR to be saved if there are supported features

From: Sean Christopherson <sean.j.christopherson@...el.com>

Add MSR_IA32_XSS to the list of MSRs reported to userspace if
supported_xss is non-zero, i.e. KVM supports at least one XSS based
feature.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
Message-Id: <20220517154100.29983-4-weijiang.yang@...el.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d7374d768296..17663cade3fa 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1451,6 +1451,7 @@ static const u32 msrs_to_save_all[] = {
 	MSR_F15H_PERF_CTR0, MSR_F15H_PERF_CTR1, MSR_F15H_PERF_CTR2,
 	MSR_F15H_PERF_CTR3, MSR_F15H_PERF_CTR4, MSR_F15H_PERF_CTR5,
 	MSR_IA32_XFD, MSR_IA32_XFD_ERR,
+	MSR_IA32_XSS,
 };
 
 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
@@ -6941,6 +6942,10 @@ static void kvm_init_msr_list(void)
 			if (!kvm_cpu_cap_has(X86_FEATURE_XFD))
 				continue;
 			break;
+		case MSR_IA32_XSS:
+			if (!kvm_caps.supported_xss)
+				continue;
+			break;
 		default:
 			break;
 		}
-- 
2.27.0