linux-kernel - Re: [PATCH v2 05/11] KVM: x86: emulator: stop using raw host flags

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Date:   Fri, 24 Feb 2023 16:38:40 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     kvm@...r.kernel.org, Sandipan Das <sandipan.das@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
        Jiaxi Chen <jiaxi.chen@...ux.intel.com>,
        Babu Moger <babu.moger@....com>, linux-kernel@...r.kernel.org,
        Jing Liu <jing2.liu@...el.com>,
        Wyes Karny <wyes.karny@....com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 05/11] KVM: x86: emulator: stop using raw host flags

On Sat, 2023-01-28 at 00:58 +0000, Sean Christopherson wrote:
> On Tue, Nov 29, 2022, Maxim Levitsky wrote:
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index f18f579ebde81c..85d2a12c214dda 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -8138,9 +8138,14 @@ static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked)
> >  	static_call(kvm_x86_set_nmi_mask)(emul_to_vcpu(ctxt), masked);
> >  }
> >  
> > -static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
> > +static bool emulator_in_smm(struct x86_emulate_ctxt *ctxt)
> >  {
> > -	return emul_to_vcpu(ctxt)->arch.hflags;
> > +	return emul_to_vcpu(ctxt)->arch.hflags & HF_SMM_MASK;
> 
> This needs to be is_smm() as HF_SMM_MASK is undefined if CONFIG_KVM_SMM=n.
> 
> > +}
> > +
> > +static bool emulator_in_guest_mode(struct x86_emulate_ctxt *ctxt)
> > +{
> > +	return emul_to_vcpu(ctxt)->arch.hflags & HF_GUEST_MASK;
> 
> And just use is_guest_mode() here.
> 

Makes sense.