On Tue, 10 Jun 2014 19:26:08 +0000
"Carew, Alan" <alan.carew at intel.com> wrote:

> One alternative for us is then to take Neil Horman's idea of scanning 
> /sys/bus/pci/devices/<D:B:D.F>/msi_irqs/
> This gives us at least (MSI | MSI-X) | INT-X, however the Virtio 
> specification mentions MSI-X explicitly for determining the correct offset 
> and might not address the underlying problem my patch set was addressing, I 
> have not tried Virtio with MSI.

MSI doesn't work with virtio. pci_enable_msi() returns error. The device
does not report MSI capability.

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