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Re: [PATCH v3 3/7] xen/evtchn: restrict the maximum number of evtchn supported for domUs
- To: Rahul Singh <rahul.singh@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Thu, 1 Sep 2022 15:53:25 +0200
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- Cc: <bertrand.marquis@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Thu, 01 Sep 2022 13:53:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Rahul,
On 01/09/2022 11:13, Rahul Singh wrote:
>
> Restrict the maximum number of evtchn supported for domUs to avoid
> allocating a large amount of memory in Xen.
>
> Set the default value of max_evtchn_port to 1023. The value of 1023
> should be sufficient for domUs guests because on ARM we don't bind
> physical interrupts to event channels. The only use of the evtchn port
> is inter-domain communications.
Following the previous discussion, I think the only missing piece is
an explanation that 1023 was chose to follow the default behavior of libxl.
Apart from that:
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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