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    Subject[PATCH v4 03/10] KVM/x86: KVM_CAP_X86_GUEST_LBR
    Date
    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 | 15 +++++++++++++++
    include/uapi/linux/kvm.h | 1 +
    3 files changed, 18 insertions(+)

    diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
    index fbda5a9..0831ac6 100644
    --- a/arch/x86/include/asm/kvm_host.h
    +++ b/arch/x86/include/asm/kvm_host.h
    @@ -865,6 +865,7 @@ 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;

    @@ -873,6 +874,7 @@ 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 f049ecf..50efee4 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -3018,6 +3018,7 @@ 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:
    @@ -4502,6 +4503,20 @@ static 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)) {
    + pr_err("Failed to enable the guest lbr feature\n");
    + 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 2b7a652..ffe31b1 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -975,6 +975,7 @@ struct kvm_ppc_resize_hpt {
    #define KVM_CAP_HYPERV_ENLIGHTENED_VMCS 163
    #define KVM_CAP_EXCEPTION_PAYLOAD 164
    #define KVM_CAP_ARM_VM_IPA_SIZE 165
    +#define KVM_CAP_X86_GUEST_LBR 166

    #ifdef KVM_CAP_IRQ_ROUTING

    --
    2.7.4
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