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i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID
This will allow Linux guests (since v6.0) to use the per-vCPU upcall vector delivered as MSI through the local APIC. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
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