linux-kernel - [PATCH v6 03/12] KVM: x86: Add Arch LBR MSRs to msrs_to_save

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Date:   Fri, 16 Jul 2021 16:49:57 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     pbonzini@...hat.com, jmattson@...gle.com, seanjc@...gle.com,
        vkuznets@...hat.com, wei.w.wang@...el.com, like.xu.linux@...il.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yang Weijiang <weijiang.yang@...el.com>
Subject: [PATCH v6 03/12] KVM: x86: Add Arch LBR MSRs to msrs_to_save_all list

Arch LBR MSR_ARCH_LBR_DEPTH and MSR_ARCH_LBR_CTL are {saved|restored}
by userspace application if they're available.

Suggested-by: Jim Mattson <jmattson@...gle.com>
Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>
---
 arch/x86/kvm/x86.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e0f4a46649d7..b586a45fce2b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1298,6 +1298,7 @@ static const u32 msrs_to_save_all[] = {
 	MSR_ARCH_PERFMON_EVENTSEL0 + 12, MSR_ARCH_PERFMON_EVENTSEL0 + 13,
 	MSR_ARCH_PERFMON_EVENTSEL0 + 14, MSR_ARCH_PERFMON_EVENTSEL0 + 15,
 	MSR_ARCH_PERFMON_EVENTSEL0 + 16, MSR_ARCH_PERFMON_EVENTSEL0 + 17,
+	MSR_ARCH_LBR_CTL, MSR_ARCH_LBR_DEPTH,
 };
 
 static u32 msrs_to_save[ARRAY_SIZE(msrs_to_save_all)];
@@ -6049,6 +6050,11 @@ static void kvm_init_msr_list(void)
 			    min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp))
 				continue;
 			break;
+		case MSR_ARCH_LBR_DEPTH:
+		case MSR_ARCH_LBR_CTL:
+			if (!kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR))
+				continue;
+			break;
 		default:
 			break;
 		}
-- 
2.21.1