linux-kernel - Re: [PATCH v3] x86: svm: use kvm_fast_pio

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Date:	Tue, 3 Mar 2015 17:44:31 +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 v3] x86: svm: use kvm_fast_pio_in()

2015-03-02 15:02-0600, Joel Schopp:
> +int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port)
> +{
> +	unsigned long val;
> +	int ret = emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, size,
> +					   port, &val, 1);
> +

Btw. does this return 1 in some scenario?

> +	if (ret)
> +		kvm_register_write(vcpu, VCPU_REGS_RAX, val);
> +	else
> +		vcpu->arch.complete_userspace_io = complete_fast_pio;
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(kvm_fast_pio_in);
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