xen: handled remapped IRQs when enabling a pcifront PCI device.
This happens to not be an issue currently because we take pains to try to ensure that the GSI-IRQ mapping is 1-1 in a PV guest and that regular event channels do not clash. However a subsequent patch is going to break this 1-1 mapping. Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org>
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