linux-kernel - Re: [PATCH 1/2] KVM: VMX: Invoke kvm_exit tracepoint on VM-Exit due to failed VM-Enter

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Date:   Mon, 11 May 2020 19:29:15 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] KVM: VMX: Invoke kvm_exit tracepoint on VM-Exit due
 to failed VM-Enter

On 11/05/20 19:08, Sean Christopherson wrote:
> On Sat, May 09, 2020 at 02:54:42PM +0200, Paolo Bonzini wrote:
>> On 09/05/20 01:53, Sean Christopherson wrote:
>>> Restore the pre-fastpath behavior of tracing all VM-Exits, including
>>> those due to failed VM-Enter.
>>>
>>> Fixes: 032e5dcbcb443 ("KVM: VMX: Introduce generic fastpath handler")
>>> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
>>> ---
>>>  arch/x86/kvm/vmx/vmx.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> Squashed, thanks.  Though is it really the right "Fixes"?
> 
> Pretty sure, that's the commit that moved trace_kvm_exit() from
> vmx_handle_exit() to vmx_vcpu_run().  Prior to that, all fastpaths still
> flowed through vmx_handle_exit().
> 

Indeed, fast path was never handled in vcpu_enter_guest.

Paolo