linux-kernel - Re: [PATCH v4 1/1] vfio/nvgpu: Add vfio pci variant module for grace hopper

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Date:   Fri, 23 Jun 2023 15:04:17 +0200
From:   Cédric Le Goater <clegoate@...hat.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     ankita@...dia.com, alex.williamson@...hat.com, aniketa@...dia.com,
        cjia@...dia.com, kwankhede@...dia.com, targupta@...dia.com,
        vsethi@...dia.com, acurrid@...dia.com, apopple@...dia.com,
        jhubbard@...dia.com, danw@...dia.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/1] vfio/nvgpu: Add vfio pci variant module for grace
 hopper

On 6/23/23 13:47, Jason Gunthorpe wrote:
> On Fri, Jun 23, 2023 at 08:27:17AM +0200, Cédric Le Goater wrote:
>>> +	req_len = vma->vm_end - vma->vm_start;
>>> +	pgoff = vma->vm_pgoff &
>>> +		((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
>>> +	if (pgoff >= (nvdev->mem_prop.mem_length >> PAGE_SHIFT))
>>> +		return -EINVAL;
>>
>> you cound introduce accessor macros for nvdev->mem_prop.mem_length and
>> nvdev->mem_prop.hpa
> 
> Accessors are not the usual style..

I meant something like

   #define nvgpu_mem_size(nvdev) (nvdev)->mem_prop.mem_length
   #define nvgpu_mem_pa_base(nvdev) (nvdev)->mem_prop.hpa

This is minor.

> 
>>> +static const struct pci_device_id nvgpu_vfio_pci_table[] = {
>>> +	{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2342) },
>>> +	{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2343) },
>>> +	{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_NVIDIA, 0x2345) },
>>
>> It would be good to add definitions for the PCI IDs.
> 
> The common form these days is to have a comment with the marketing
> name, we stopped putting constants for every device a while ago.

OK then.

Thanks,

C.