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Date: Mon, 2 Mar 2015 14:38:44 +0100
From: Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>
To: Joel Schopp <joel.schopp@amd.com>
Cc: Gleb Natapov <gleb@kernel.org>, Paolo Bonzini <pbonzini@redhat.com>,
        kvm@vger.kernel.org, David Kaplan <David.Kaplan@amd.com>,
        Joerg Roedel <joro@8bytes.org>, Marcelo Tosatti <mtosatti@redhat.com>,
        linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH] x86: svm: use kvm_fast_pio_in()
Message-ID: <20150302133844.GA25560@potion.brq.redhat.com>
References: <20150228000422.11892.98236.stgit@joelvmguard2.amd.com>
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2015-02-27 18:04-0600, Joel Schopp:
> From: David Kaplan <David.Kaplan@amd.com>
> 
> We can make the in instruction go faster the same way the out instruction is
> already.
> 
> Signed-off-by: David Kaplan <David.Kaplan@amd.com>
> [extracted from larger unlrelated patch, forward ported, tested]
> Signed-off-by: Joel Schopp <joel.schopp@amd.com>
> ---
>  arch/x86/kvm/svm.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> @@ -1907,6 +1907,8 @@ static int io_interception(struct vcpu_svm *svm)
>  	svm->next_rip = svm->vmcb->control.exit_info_2;
>  	skip_emulated_instruction(&svm->vcpu);
>  
> +	if (in)
> +		return kvm_fast_pio_in(vcpu, size, port);

Have I missed a patch that defined kvm_fast_pio_in()?

Thanks.