Re: KVM devices assignment; PCIe AER?

[Chris Wright <chrisw@sous-sol.org>]

* etmartin101 (etmartin101@gmail.com) wrote:
> Part of the project I'm working on, we are looking at extending the
> device assignment capabilities to provide support for PCIe AER.

How did you plan to do this?  Right now we only provide PCI capabilities
(not Extended Capabilities).

> Ideally, the host would register for AER (for every assigned
> devices) and pass them up to Qemu.

This should be so for devices iff they support AER to begin with.

Having proper chipset support in QEMU (PCIe + AER) also a step.

> As of now, one of the problem is that KVM is not a driver for the
> assigned devices. I've seen Chris's slides from KVM conf 2010 but I
> haven't seen any patches or discussion on that topic...
> 
> On another front, I've seen the work from Michael around 'uio_pci_generic'
> and some of his comments:
>   " It's expected that more features of interest to virtualization will be
>   added to this driver in the future. Possibilities are: mmap for device
>   resources, MSI/MSI-X, eventfd (to interface with kvm), iommu."
> 
> I think that extending 'uio_pci_generic' to support AER is
> relatively straight forward (assuming eventfd support from UIO).

Did you look at VFIO?

thanks,
-chris