Re: [Xen-devel] [PATCH v2 2/4] x86/apic: force phys mode if interrupt remapping is disabled

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Nov 29, 2019 at 12:28:49PM +0100, Roger Pau Monne wrote:
> Cluster mode can only be used with interrupt remapping support, since
> the top 16bits of the APIC ID are filled with the cluster ID, and
> hence on systems where the physical ID is still smaller than 255 the
> cluster ID is not. Force x2APIC to use physical mode if there's no
> interrupt remapping support.
> 
> Note that this requires a further patch in order to enable x2APIC
> without interrupt remapping support.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

This is missing a command line doc update and the logic below ignores
a user-set x2apic_phys value. Will wait for comments on other patches
before resending, sorry.

Roger.

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