On 04.12.2019 17:20, Roger Pau Monne wrote:
> Check that the processor to be woken up APIC ID is addressable in the
> current APIC mode.
>
> Note that in practice systems with APIC IDs > 255 should already have
> x2APIC enabled by the firmware, and hence this is mostly a safety
> belt.
>
> Signed-off-by: Roger Pau Monné <roger....@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com>
with ...
> --- a/xen/arch/x86/smpboot.c
> +++ b/xen/arch/x86/smpboot.c
> @@ -1317,6 +1317,13 @@ int __cpu_up(unsigned int cpu)
> if ( (apicid = x86_cpu_to_apicid[cpu]) == BAD_APICID )
> return -ENODEV;
>
> + if ( (!x2apic_enabled || !iommu_intremap) && (apicid >> 8) )
> + {
> + printk("Unsupported: APIC ID %#x in xAPIC mode w/o interrupt
> remapping",
> + apicid);
... the lost newline added back (can be done while commiting).
Jan
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