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Re: [Xen-devel] [PATCH v3 3/4] iommu: introduce iommu_groups


  • To: Paul Durrant <paul.durrant@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 16 Jul 2019 11:26:28 +0100
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
  • Delivery-date: Tue, 16 Jul 2019 10:26:39 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 16/07/2019 11:16, Paul Durrant wrote:
> +int iommu_group_assign(struct pci_dev *pdev, void *arg)
> +{
> +    const struct iommu_ops *ops = iommu_get_ops();
> +    int id;
> +    struct iommu_group *grp;
> +
> +    if ( !ops->get_device_group_id )
> +        return 0;
> +
> +    id = ops->get_device_group_id(pdev->seg, pdev->bus, pdev->devfn);
> +    if ( id < 0 )
> +        return -ENODATA;
> +
> +    grp = get_iommu_group(id);
> +    if ( !grp )
> +        return -ENOMEM;
> +
> +    if ( iommu_verbose )
> +        printk(XENLOG_INFO "Assign %04x:%02x:%02x.%u -> IOMMU group %x\n",

No unadorned hex numbers please.  This is a recipe for confusion during
debugging.

Either %#x, or %u, and needs to be fixed on commit if we go with that route.

~Andrew

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