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, peterz@infradead.org
Cc: kan.liang@intel.com, mingo@redhat.com, rkrcmar@redhat.com,
like.xu@intel.com, wei.w.wang@intel.com, jannh@google.com,
arei.gonglei@huawei.com, jmattson@google.com
Subject: [PATCH v6 03/12] KVM/x86: KVM_CAP_X86_GUEST_LBR
Date: Thu, 6 Jun 2019 15:02:22 +0800 [thread overview]
Message-ID: <1559804551-42271-4-git-send-email-wei.w.wang@intel.com> (raw)
In-Reply-To: <1559804551-42271-1-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: Wei Wang <wei.w.wang@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/x86.c | 14 ++++++++++++++
include/uapi/linux/kvm.h | 1 +
3 files changed, 17 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 450d69a..a6cc967 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -874,6 +874,7 @@ struct kvm_arch {
atomic_t vapics_in_nmi_mode;
struct mutex apic_map_lock;
struct kvm_apic_map *apic_map;
+ struct x86_perf_lbr_stack lbr_stack;
bool apic_access_page_done;
@@ -882,6 +883,7 @@ struct kvm_arch {
bool mwait_in_guest;
bool hlt_in_guest;
bool pause_in_guest;
+ bool lbr_in_guest;
unsigned long irq_sources_bitmap;
s64 kvmclock_offset;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index acb179f..524e663 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3089,6 +3089,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_GET_MSR_FEATURES:
case KVM_CAP_MSR_PLATFORM_INFO:
case KVM_CAP_EXCEPTION_PAYLOAD:
+ case KVM_CAP_X86_GUEST_LBR:
r = 1;
break;
case KVM_CAP_SYNC_REGS:
@@ -4622,6 +4623,19 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
kvm->arch.exception_payload_enabled = cap->args[0];
r = 0;
break;
+ case KVM_CAP_X86_GUEST_LBR:
+ r = -EINVAL;
+ if (cap->args[0] &&
+ x86_perf_get_lbr_stack(&kvm->arch.lbr_stack))
+ break;
+
+ if (copy_to_user((void __user *)cap->args[1],
+ &kvm->arch.lbr_stack,
+ sizeof(struct x86_perf_lbr_stack)))
+ break;
+ kvm->arch.lbr_in_guest = cap->args[0];
+ r = 0;
+ break;
default:
r = -EINVAL;
break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2fe12b4..5391cbc 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -993,6 +993,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_SVE 170
#define KVM_CAP_ARM_PTRAUTH_ADDRESS 171
#define KVM_CAP_ARM_PTRAUTH_GENERIC 172
+#define KVM_CAP_X86_GUEST_LBR 173
#ifdef KVM_CAP_IRQ_ROUTING
--
2.7.4
next prev parent reply other threads:[~2019-06-06 7:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 7:02 [PATCH v6 00/12] Guest LBR Enabling Wei Wang
2019-06-06 7:02 ` [PATCH v6 01/12] perf/x86: fix the variable type of the LBR MSRs Wei Wang
2019-06-06 7:02 ` [PATCH v6 02/12] perf/x86: add a function to get the lbr stack Wei Wang
2019-06-06 7:02 ` Wei Wang [this message]
2019-06-06 7:02 ` [PATCH v6 04/12] KVM/x86: intel_pmu_lbr_enable Wei Wang
2019-06-06 7:02 ` [PATCH v6 05/12] KVM/x86/vPMU: tweak kvm_pmu_get_msr Wei Wang
2019-06-06 7:02 ` [PATCH v6 06/12] KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest Wei Wang
2019-06-06 7:02 ` [PATCH v6 07/12] perf/x86: no counter allocation support Wei Wang
2019-06-06 7:02 ` [PATCH v6 08/12] KVM/x86/vPMU: Add APIs to support host save/restore the guest lbr stack Wei Wang
2019-06-06 7:02 ` [PATCH v6 09/12] perf/x86: save/restore LBR_SELECT on vCPU switching Wei Wang
2019-06-06 7:02 ` [PATCH v6 10/12] KVM/x86/lbr: lazy save the guest lbr stack Wei Wang
2019-06-06 7:02 ` [PATCH v6 11/12] KVM/x86: remove the common handling of the debugctl msr Wei Wang
2019-06-06 7:02 ` [PATCH v6 12/12] KVM/VMX/vPMU: support to report GLOBAL_STATUS_LBRS_FROZEN Wei Wang
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