linux-kernel - Re: [PATCH 2/3] KVM: x86: Avoid guest page table walk when gpa

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Message-ID: <20170818124047.GC20100@flask>
Date:   Fri, 18 Aug 2017 14:40:47 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, wanpeng.li@...mail.com,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH 2/3] KVM: x86: Avoid guest page table walk when
 gpa_available is set

2017-08-18 14:37+0200, Paolo Bonzini:
> On 18/08/2017 14:36, Radim Krčmář wrote:
> >>> +		gpa = vcpu->arch.gpa_val;
> >>> +		ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write);
> >>> +	} else {
> >>> +		ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
> >>>  	}
> >>>  
> >>> -	ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
> >>> -
> >>>  	if (ret < 0)
> >>>  		return X86EMUL_PROPAGATE_FAULT;
> >> just wondering if it makes sense to move this into the else branch (as
> >> it logically only belongs to vcpu_mmio_gva_to_gpa)
> >
> > It does, I took the liberty to change that.
> 
> It was on purpose, but it's okay either way. :)

Oh, sorry, I was thinking that vcpu_is_mmio_gpa() should return bool. :)