Re: [PATCH] KVM: x86/xen: Convert evtchn_ports from IDR to XArray

[Furkan Çalışkan <frn1furkan10@xxxxxxxxx>]

On 7/7/26 12:16, David Woodhouse wrote:
> On Mon, 2026-07-06 at 11:13 +0300, Furkan Caliskan wrote:
>> IDR is deprecated in favor of XArray: see
>> Documentation/core-api/idr.rst. Convert evtchn_ports accordingly.
>>
>> kvm_xen_eventfd_assign()'s single-slot idr_alloc() becomes
>> xa_insert(), since it was really an insert-at-index, not an
>> allocation: -EBUSY replaces -ENOSPC, still mapped to -EEXIST.
>>
>> kvm_xen_hcall_evtchn_send() drops its explicit rcu_read_lock(),
>> since xa_load() takes its own RCU read-side section internally.
>> evtchnfd's lifetime is still guaranteed by kvm->srcu.
>>
>> xen_lock is left in place: it protects state beyond the map itself.
>>
>> Signed-off-by: Furkan Caliskan <frn1furkan10@xxxxxxxxx>
> 
> Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> 
> Thanks.

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