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

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Message-ID: <20150302140947.GB26739@potion.brq.redhat.com>
Date:	Mon, 2 Mar 2015 15:09:48 +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>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86: svm: make wbinvd faster

2015-02-27 18:19-0600, 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
> +static int wbinvd_interception(struct vcpu_svm *svm)
> +{
> +	kvm_emulate_wbinvd(&svm->vcpu);
> +	skip_emulated_instruction(&svm->vcpu);
> +	return 1;
> +}
> +
> +

(One line is optimal.)
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