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


  • To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <JBeulich@xxxxxxxx>
  • Date: Tue, 16 Jul 2019 10:37:38 +0000
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, TimDeegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>
  • Delivery-date: Tue, 16 Jul 2019 10:39:29 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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  • Thread-topic: [PATCH v3 3/4] iommu: introduce iommu_groups

On 16.07.2019 12:26, Andrew Cooper wrote:
> 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.

I assume (hope) that you mean this for the right most number only; it's not
entirely unambiguous from your reply.

Jan
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