linux-kernel - Re: [PATCH] perf/x86/intel/pt: Don't die on VMXON

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Message-ID: <20160413105331.GA30907@gmail.com>
Date:	Wed, 13 Apr 2016 12:53:31 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, x86@...nel.org,
	kvm@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] perf/x86/intel/pt: Don't die on VMXON


* Alexander Shishkin <alexander.shishkin@...ux.intel.com> wrote:

> Ingo Molnar <mingo@...nel.org> writes:
> 
> >> @@ -3144,6 +3146,8 @@ static void vmclear_local_loaded_vmcss(void)
> >>  static void kvm_cpu_vmxoff(void)
> >>  {
> >>  	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
> >> +
> >> +	intel_pt_vmx(0);
> >>  }
> >
> > Yeah so the name intel_pt_vmx() is pretty information-free because it has no verb, 
> > only nouns - please name new functions descriptively to after what they do!
> 
> I do agree that it can use a better name (and this is a second attempt
> already).
> 
> > Something like intel_pt_set_vmx_state() or so?
> 
> Hmm how about intel_pt_handle_vmx()? Ideally, akin to the VMXON/VMXOFF insns, 
> this could be two functions (intel_pt_handle_vmx{on,off}()) if the global 
> namespace can take it.

Sure, intel_pt_handle_vmx(0/1) sounds good too. I wouldn't split it into two 
functions ...

Thanks,

	Ingo