Re: [Xen-devel] [PATCH] x86/apic/x2apic: Share IRQ vector between cluster members only when no cpumask is specified

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Andrew Cooper <andrew.cooper3@xxxxxxxxxx> 08/07/17 4:39 PM >>>
>On 07/08/17 09:18, Jan Beulich wrote:
>> Wouldn't it be sufficient for people running into vector shortage due to
>> sharing to specify "x2apic_phys" on the command line?
>
>Had XenServer noticed this change in default earlier, I would have
>insisted that you make x2apic_phys the default.

Change in default? About five and a half years ago I did implement cluster
mode properly, but I wasn't able to spot a commit that changed the
default from physical to cluster.

>On affected systems, problem manifests as an upgrade where the new
>hypervisor doesn't boot.  Recovering from this requires human
>intervention during the server boot.

This needs some more explanation: Why would the hypervisor not boot?
Even if you said Dom0 didn't boot, it wouldn't really be clear to me why,
as running out of vectors would likely occur only after critical devices
had their drivers loaded.

Jan


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