RE: [Xen-devel] x2apic mode vs. interrupt remapping

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

According to the #Cset20168, x2apic is only enabled when all VT-d engines 
support IR and EIM support, so the policy should be same with Linux's.
Xiantao

Jan Beulich wrote:
> Hi,
> 
> while the Linux kernel enters x2apic mode only when it was able to
> initialize interrupt remapping (leaving aside a KVM special case), Xen
> treats the two features as independent ones. We're having a report
> where interrupt delivery doesn't work in x2apic mode (i.e. no-x2apic
> makes the system boot successfully), and hence I'm wondering why
> Xen would use this mode on a wider range of machines than Linux.
> 
> Thanks, Jan
> 
> 
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