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From: Wei Wang <wei.w.wang@intel.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	pbonzini@redhat.com, ak@linux.intel.com
Cc: kan.liang@intel.com, peterz@infradead.org, mingo@redhat.com,
	rkrcmar@redhat.com, like.xu@intel.com, wei.w.wang@intel.com
Subject: [PATCH v2 2/8] KVM/x86: KVM_CAP_X86_GUEST_LBR
Date: Thu,  6 Sep 2018 19:30:50 +0800	[thread overview]
Message-ID: <1536233456-12173-3-git-send-email-wei.w.wang@intel.com> (raw)
In-Reply-To: <1536233456-12173-1-git-send-email-wei.w.wang@intel.com>

Introduce KVM_CAP_X86_GUEST_LBR to allow per-VM enabling of the guest
lbr feature.

Signed-off-by: Like Xu <like.xu@intel.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/x86.c              | 5 +++++
 include/uapi/linux/kvm.h        | 1 +
 3 files changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 00ddb0c..5db5ba3 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -822,6 +822,7 @@ struct kvm_arch {
 
 	gpa_t wall_clock;
 
+	bool guest_lbr;
 	bool mwait_in_guest;
 	bool hlt_in_guest;
 	bool pause_in_guest;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 506bd2b..3eaf1b8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2927,6 +2927,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
  	case KVM_CAP_SPLIT_IRQCHIP:
 	case KVM_CAP_IMMEDIATE_EXIT:
 	case KVM_CAP_GET_MSR_FEATURES:
+	case KVM_CAP_X86_GUEST_LBR:
 		r = 1;
 		break;
 	case KVM_CAP_SYNC_REGS:
@@ -4350,6 +4351,10 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
 			kvm->arch.pause_in_guest = true;
 		r = 0;
 		break;
+	case KVM_CAP_X86_GUEST_LBR:
+		kvm->arch.guest_lbr = true;
+		r = 0;
+		break;
 	default:
 		r = -EINVAL;
 		break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 07548de..7cf9bc0 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -952,6 +952,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_S390_HPAGE_1M 156
 #define KVM_CAP_NESTED_STATE 157
 #define KVM_CAP_ARM_INJECT_SERROR_ESR 158
+#define KVM_CAP_X86_GUEST_LBR 159
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.7.4


  parent reply	other threads:[~2018-09-06 12:01 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-06 11:30 [PATCH v2 0/8] Guest LBR Enabling Wei Wang
2018-09-06 11:30 ` [PATCH v2 1/8] perf/x86: add a function to get the lbr stack Wei Wang
2018-09-07  3:28   ` Andi Kleen
2018-09-07  6:45     ` Wei Wang
2018-09-06 11:30 ` Wei Wang [this message]
2018-09-06 11:30 ` [PATCH v2 3/8] KVM/vmx: Pass through the lbr stack to a guest Wei Wang
2018-09-06 11:30 ` [PATCH v2 4/8] KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest Wei Wang
2018-09-06 11:30 ` [PATCH v2 5/8] KVM/x86: enable the guest to access the debugctl msr Wei Wang
2018-09-06 11:30 ` [PATCH v2 6/8] perf/x86/intel/lbr: guest requesting KVM for lbr stack save/restore Wei Wang
2018-09-07  3:27   ` Andi Kleen
2018-09-07  5:24     ` Wei Wang
2018-09-07 14:10       ` Andi Kleen
2018-09-07 15:20         ` Wang, Wei W
2018-09-07 20:05           ` Andi Kleen
2018-09-08  1:34             ` Wang, Wei W
2018-09-06 11:30 ` [PATCH v2 7/8] KVM: PMU: support to save/restore the guest lbr stack on vCPU switching Wei Wang
2018-09-07 14:36   ` Jann Horn
2018-09-07 15:21     ` Wang, Wei W
2018-09-18  0:58   ` Gonglei (Arei)
2018-09-18  2:56     ` Andi Kleen
2018-09-18  9:57       ` Wei Wang
2018-09-18 10:34         ` Gonglei (Arei)
2018-09-06 11:30 ` [PATCH v2 8/8] perf/x86/intel/lbr: add the guest_lbr boolean to cpuc Wei Wang

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