x86/xen: Consolidate XEN-MSI init
X86 cannot store the irq domain pointer in struct device without breaking XEN because the irq domain pointer takes precedence over arch_*_msi_irqs() fallbacks. To achieve this XEN MSI interrupt management needs to be wrapped into an irq domain. Move the x86_msi ops setup into a single function to prepare for this. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20200826112333.420224092@linutronix.de
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