[Xen-devel] Linux 4.5's nfp_net_irq_unmask_msix() vs Xen

["Jan Beulich" <JBeulich@xxxxxxxx>]

All,

the new driver homed under drivers/net/ethernet/netronome/nfp/
has some direct MSI-X table manipulation which quite clearly is
incompatible with Xen. According to the comment preceding the
function, bypassing the Linux IRQ subsystem is intentional here.
Irrespective of the question of whether that's a good idea, this
also bypassing the abstractions allowing MSI to work on Xen
clearly needs addressing. Does anyone have any thoughts on how
to reasonably achieve this? Calling pci_msi_unmask_irq() would
seem to be an option (the symbol at least is exported), but likely
isn't intended to be used that way.

Jan


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