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Re: [PATCH for-4.22 v2.5] xen/arm: gic: defer host LPI allocation until after ITS init
- To: Julien Grall <julien@xxxxxxx>, Mykola Kvach <mykola_kvach@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Fri, 19 Jun 2026 13:34:48 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Luca Fancellu <luca.fancellu@xxxxxxx>, Mykola Kvach <xakep.amatop@xxxxxxxxx>, "Oleksandr Tyshchenko" <oleksandr_tyshchenko@xxxxxxxx>
- Delivery-date: Fri, 19 Jun 2026 11:35:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19-Jun-26 13:23, Julien Grall wrote:
> Hi Michal,
>
> On 19/06/2026 10:48, Orzel, Michal wrote:
>> @Oleksii, can we ask for a release ack here?
>
> Can you explain the pros/cons of introducing this patch quite late?
The advantage is that it fixes the broken LPIs on affected hardware.
The disadvantage is the reordering risk but I don't think there is any issue.
>
> One of the risk here is that we are now initializing the LPIs *after*
> the ITSes. I understand this is because we want to know the workaround.
> However, I vaguely recall that there was a dependency in the
> configuration. So are we confident the new ordering will not bring other
> issues? Ideally this should have been explained in the commit message.
gic-v3-its.c never references host LPI state, so ITS init has no dependency on
LPIs.
~Michal
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