linux-kernel - Re: [PATCH 3/3] KVM: SVM: Use compound literal in lieu of __maybe

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Message-ID: <ZnGPSEB9GOclr9yO@google.com>
Date: Tue, 18 Jun 2024 06:44:40 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] KVM: SVM: Use compound literal in lieu of
 __maybe_unused rdmsr() param

On Tue, Jun 18, 2024, Borislav Petkov wrote:
> > +		rdmsr(MSR_TSC_AUX, sev_es_host_save_area(sd)->tsc_aux, (u32){0});
> >  
> >  	return 0;
> >  }
> > -- 
> 
> Right, slick, but I'd argue that before it was better because __maybe_unused was
> actually documenting why that var is there.
> 
> (u32){} looks a bit more cryptic but meh, ok, I guess.

Yeah, I'm 50/50 on whether it's too clever.  I'm totally fine keeping msr_hi,
what I really want to do is rewrite the rdmsr() macros to return values :-/