linux-kernel - Re: [PATCH v2 07/21] KVM: x86: Use DR7_GD macro instead of open coding check in emulator

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Date:   Wed, 06 Jul 2022 14:58:18 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: Re: [PATCH v2 07/21] KVM: x86: Use DR7_GD macro instead of open
 coding check in emulator

On Tue, 2022-06-14 at 20:47 +0000, Sean Christopherson wrote:
> Use DR7_GD in the emulator instead of open coding the check, and drop a
> comically wrong comment.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/kvm/emulate.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> index 39ea9138224c..bf499716d9d3 100644
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -4182,8 +4182,7 @@ static int check_dr7_gd(struct x86_emulate_ctxt *ctxt)
>  
>  	ctxt->ops->get_dr(ctxt, 7, &dr7);
>  
> -	/* Check if DR7.Global_Enable is set */
> -	return dr7 & (1 << 13);
> +	return dr7 & DR7_GD;
>  }
>  
>  static int check_dr_read(struct x86_emulate_ctxt *ctxt)


Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky