[libvirt] [PATCH V2] virpci: support driver_override sysfs interface

Jim Fehlig jfehlig at suse.com
Wed Aug 31 19:42:06 UTC 2016

On 08/30/2016 11:59 PM, Laine Stump wrote:
> On 08/01/2016 11:36 PM, Jim Fehlig wrote:
>> libvirt uses the new_id PCI sysfs interface to bind a PCI stub driver
>> to a PCI device. The new_id interface is known to be buggy and racey,
>> hence a more deterministic interface was introduced in the 3.12 kernel:
>> driver_override. For more details see
>> https://www.redhat.com/archives/libvir-list/2016-June/msg02124.html
> That message details the change to the kernel that caused the regression for
> Xen, but not the driver_override interface. Maybe you could add a link to the
> kernel commit that adds driver_override:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/pci/pci-driver.c?h=v3.12&id=782a985d7af26db39e86070d28f987cad21313c0

Yep, good point. Nice to have a description of the interface and examples of its
use. I'll add it to the commit messages.

> Everything else looks good, and passes my tests for vfio device assignment
> (including when the host driver has been blacklisted).
> ACK. (Sorry I forgot about this earlier in the month :-/)

Thanks! I'll wait until 2.2.0 is out before pushing this.


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