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 08:47:58 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Cédric Le Goater <clegoate@...hat.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 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..

> > +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.

Jason