linux-kernel - Re: [PATCH v2 16/23] x86,vmx: Provide asm-goto-output vmread

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Message-ID: <YbkjmGRUHgZifkB0@google.com>
Date:   Tue, 14 Dec 2021 23:07:04 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, jpoimboe@...hat.com,
        mark.rutland@....com, dvyukov@...gle.com, pbonzini@...hat.com,
        mbenes@...e.cz
Subject: Re: [PATCH v2 16/23] x86,vmx: Provide asm-goto-output vmread

On Tue, Dec 14, 2021, Peter Zijlstra wrote:
> On Tue, Dec 14, 2021 at 06:44:48PM +0000, Sean Christopherson wrote:
> > ---
> >  arch/x86/kvm/vmx/vmenter.S |  2 ++
> >  arch/x86/kvm/vmx/vmx.c     |  7 +++++++
> >  arch/x86/kvm/vmx/vmx_ops.h | 31 +++++++++++++++++++++++++++++++
> >  3 files changed, 40 insertions(+)
> > 
> > diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
> > index 3a6461694fc2..d8a7a0a69ec1 100644
> > --- a/arch/x86/kvm/vmx/vmenter.S
> > +++ b/arch/x86/kvm/vmx/vmenter.S
> > @@ -238,6 +238,7 @@ SYM_FUNC_END(__vmx_vcpu_run)
> > 
> >  .section .text, "ax"
> > 
> > +#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
> 
> #ifndef ?

Huh.  Yes.  Could have sworn my gcc version doesn't have goto with output.