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    Subject[PATCH] KVM: VMX: add tracepoint for vpids
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    Date
    From: Davidlohr Bueso <dave@gnu.org>

    Add a new tracepoint for vpid allocation and freeing associated to all vCPUs.

    Signed-off-by: Davidlohr Bueso <dave@gnu.org>
    ---
    arch/x86/kvm/trace.h | 23 +++++++++++++++++++++++
    arch/x86/kvm/vmx.c | 5 ++++-
    arch/x86/kvm/x86.c | 1 +
    3 files changed, 28 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
    index 911d264..2106a37 100644
    --- a/arch/x86/kvm/trace.h
    +++ b/arch/x86/kvm/trace.h
    @@ -27,6 +27,29 @@ TRACE_EVENT(kvm_entry,
    );

    /*
    + * Tracepoint for VMX vpid management
    + */
    +TRACE_EVENT(kvm_vpid,
    + TP_PROTO(int vpid, bool allocate),
    + TP_ARGS(vpid, allocate),
    +
    + TP_STRUCT__entry(
    + __field( int, vpid )
    + __field( bool, allocate )
    + ),
    +
    + TP_fast_assign(
    + __entry->vpid = vpid;
    + __entry->allocate = allocate;
    + ),
    +
    + TP_printk("%s vpid %d", __entry->allocate ?
    + "allocate" : "free", __entry->vpid)
    +);
    +#define trace_kvm_free_vpid(vpid) trace_kvm_vpid(vpid, 0)
    +#define trace_kvm_alloc_vpid(vpid) trace_kvm_vpid(vpid, 1)
    +
    +/*
    * Tracepoint for hypercall.
    */
    TRACE_EVENT(kvm_hypercall,
    diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
    index 2c22fc7..5647805 100644
    --- a/arch/x86/kvm/vmx.c
    +++ b/arch/x86/kvm/vmx.c
    @@ -3571,6 +3571,7 @@ static void allocate_vpid(struct vcpu_vmx *vmx)
    vmx->vpid = vpid;
    __set_bit(vpid, vmx_vpid_bitmap);
    }
    + trace_kvm_alloc_vpid(vpid);
    spin_unlock(&vmx_vpid_lock);
    }

    @@ -3579,8 +3580,10 @@ static void free_vpid(struct vcpu_vmx *vmx)
    if (!enable_vpid)
    return;
    spin_lock(&vmx_vpid_lock);
    - if (vmx->vpid != 0)
    + if (vmx->vpid != 0) {
    + trace_kvm_free_vpid(vmx->vpid);
    __clear_bit(vmx->vpid, vmx_vpid_bitmap);
    + }
    spin_unlock(&vmx_vpid_lock);
    }

    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 7ce5878..8a20512 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -6606,3 +6606,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
    EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
    EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
    EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
    +EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vpid);
    --
    1.7.4.1




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