linux-kernel - Re: [PATCH] irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports

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Message-ID: <87h5rsb64v.ffs@tglx>
Date: Sat, 07 Feb 2026 22:22:56 +0100
From: Thomas Gleixner <tglx@...nel.org>
To: Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Cc: Robin Murphy <robin.murphy@....com>, stable@...r.kernel.org
Subject: Re: [PATCH] irqchip/gic-v3-its: Limit number of per-device MSIs to
 the range the ITS supports

On Fri, Feb 06 2026 at 15:48, Marc Zyngier wrote:

> The ITS driver blindly assumes that EventIDs are in abundant supply,
> to the point where it never checks how many the HW actually supports.
>
> It turns out that some pretty esoteric integrations make it so that
> only a few bits are available, all the way down to a. single. bit.
>
> Enforce the advertised limitation at the point of allocating the
> device structure, and hope that the endpoint driver can deal with
> such limitation.
>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Cc: stable@...r.kernel.org

Can you please provide a Fixes tag?

Thanks,

        tglx