Re: [libvirt] [question]Why libvirt bind all devices with same vendor id and device id to vfio-pci driver, and only unbind devices used by VMs to original driver?

On Mon, 9 Oct 2017 09:28:27 +0000 "Wuzongyong (Euler Dept)" <cordius.wu@huawei.com> wrote:

Hi,

As the title says, I thought that it's a bit unreasonable and inconsistent to unbind devices assigned to VMs to original driver and leave other devices binding to vfio-pci driver. Why not to bind devices we need to vfio-pci driver instead of bind all devices with same type to vfio-pci driver? Or, we may can rebind devices unused with same type to original driver.

Because that's the way the kernel's new_id interface works, any matching device without a driver will probe the new_id driver. For a new enough kernel and libvirt, the driver_override interface should be used instead, which will only bind the target device. Thanks, Alex