On Fri, Mar 20, 2009 at 03:53:12AM +0800, Matthew Wilcox wrote:
> On Wed, Mar 11, 2009 at 03:25:42PM +0800, Yu Zhao wrote:
> > +config PCI_IOV
> > + bool "PCI IOV support"
> > + depends on PCI
> > + help
> > + PCI-SIG I/O Virtualization (IOV) Specifications support.
> > + Single Root IOV: allows the creation of virtual PCI devices
> > + that share the physical resources from a real device.
> > +
> > + When in doubt, say N.
>
> It's certainly shorter than my text, which is nice. But I think it
> still has too much spec-ese and not enough explanation. How about:
>
> help
> I/O Virtualization is a PCI feature supported by some devices
> which allows them to create virtual devices which share their
> physical resources.
>
> If unsure, say N.
Yes, it's more user-friendly.
> > + list_for_each_entry(pdev, &dev->bus->devices, bus_list)
> > + if (pdev->is_physfn)
> > + break;
> > + if (list_empty(&dev->bus->devices) || !pdev->is_physfn)
> > + pdev = NULL;
>
> This is still wrong. If the 'break' condition is not hit, pdev is
> pointing to garbage, not to the last pci_dev in the list.
Yes, you are right. I should think it over after you commented on it
last time.
So it looks like we need to make it as:
ctrl = 0;
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
if (pdev->is_physfn)
goto found;
pdev = NULL;
if (pci_ari_enabled(dev->bus))
ctrl |= PCI_SRIOV_CTRL_ARI;
found:
pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, ctrl);
...
> > @@ -270,6 +278,7 @@ struct pci_dev {
> > struct list_head msi_list;
> > #endif
> > struct pci_vpd *vpd;
> > + struct pci_sriov *sriov; /* SR-IOV capability related */
>
> Should be ifdeffed?
Yes, will do.
Thank you for reviewing it. The patch series was applied on Xen Domain0
tree 2 days ago, and I'll carry your comments back to Xen tree too.
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