Re: KVM devices assignment; PCIe AER?

Etienne Martineau
2010-10-26T22:08:22Z

On Tue, 26 Oct 2010, Chris Wright wrote:

>> ***One of the aspect I'm not clear is the strategy for
>> device-assignment under KVM?
>> A) Move to VFIO; [/dev/iommu, /dev/vfio]
>
> Long term, hopefully VFIO
>
>> B) KVM as a driver for the assigned devices; [sysfs/ ioctls..]
>
> Short term (i.e. current qemu-kvm tree...this is what we have now and
> will continue to until plan A) gets more mature).
>
Strictly speaking, I don't really agree with 'B' being the current
implementation. Correct me if I'm wrong but for assigned devices, kvm
does a look up for the device and eventually obtain a handle to it (struct
pci_dev*) without doing a proper 'pci_register_driver'.

I think we need to register with PCI and provide 'pci_error_handlers'
callback if we wants to receive AER notification.

In that context, do you think it's acceptable for KVM to be the driver of
the assigned devices? OR should we simply add the AER logic into
existing pci-stub and relay the information to user-space through
eventfd...

Thanks,
Etienne