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: <86zf5kb38m.wl-maz@kernel.org>
Date: Sat, 07 Feb 2026 22:25:29 +0000
From: Marc Zyngier <maz@...nel.org>
To: Thomas Gleixner <tglx@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	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 Sat, 07 Feb 2026 21:22:56 +0000,
Thomas Gleixner <tglx@...nel.org> wrote:
> 
> 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?

That'd be

Fixes: 84a6a2e7fc18d ("irqchip: GICv3: ITS: device allocation and configuration")

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.