linux-kernel - Re: [PATCH 2/3] HYPERV/IOMMU: Add Hyper-V stub IOMMU driver

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Message-ID: <20190201163443.GS32526@8bytes.org>
Date:   Fri, 1 Feb 2019 17:34:43 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     lantianyu1986@...il.com
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>, mchehab+samsung@...nel.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, nicolas.ferre@...rochip.com,
        arnd@...db.de, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, michael.h.kelley@...rosoft.com,
        kys@...rosoft.com, vkuznets@...hat.com, alex.williamson@...hat.com
Subject: Re: [PATCH 2/3] HYPERV/IOMMU: Add Hyper-V stub IOMMU driver

Hi,

On Thu, Jan 31, 2019 at 06:17:32PM +0800, lantianyu1986@...il.com wrote:
> +config HYPERV_IOMMU
> +	bool "Hyper-V stub IOMMU support"

This is not a real IOMMU driver, it only implements IRQ remapping
capabilities. Please change the name to reflect that, e.g. to
"Hyper-V IRQ Remapping Support" or something like that.

> +static int __init hyperv_prepare_irq_remapping(void)
> +{
> +	struct fwnode_handle *fn;
> +	u32 apic_id;
> +	int i;
> +
> +	if (x86_hyper_type != X86_HYPER_MS_HYPERV ||
> +	    !x2apic_supported())
> +		return -ENODEV;
> +
> +	fn = irq_domain_alloc_named_id_fwnode("HYPERV-IR", 0);
> +	if (!fn)
> +		return -EFAULT;

Why does this return -EFAULT? I guess there is no fault happening in
irq_domain_alloc_named_id_fwnode()...


	Joerg