linux-kernel - Re: [PATCH v2 2/2] x86: svm: make wbinvd faster

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Date:	Mon, 2 Mar 2015 20:05:34 +0100
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Joel Schopp <joel.schopp@....com>
Cc:	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	David Kaplan <David.Kaplan@....com>,
	Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v2 2/2] x86: svm: make wbinvd faster

2015-03-02 12:04-0600, Joel Schopp:
> From: David Kaplan <David.Kaplan@....com>
> No need to re-decode WBINVD since we know what it is from the intercept.
> 
> Signed-off-by: David Kaplan <David.Kaplan@....com>
> [extracted from larger unlrelated patch, forward ported, tested]
> Signed-off-by: Joel Schopp <joel.schopp@....com>
> ---

Reviewed-by: Radim Krčmář <rkrcmar@...hat.com>

> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> @@ -2774,6 +2774,13 @@ static int skinit_interception(struct vcpu_svm *svm)
>  	return 1;
>  }
>  
> +static int wbinvd_interception(struct vcpu_svm *svm)
> +{
> +	kvm_emulate_wbinvd(&svm->vcpu);
> +	return 1;
> +}
> +
> +

(Squashing these lines would have been a nice improvement.)

>  static int xsetbv_interception(struct vcpu_svm *svm)
>  {
>  	u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
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