linux-kernel - Re: [PATCH RFC 0/3] virtio: silence KCSAN warnings

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Message-ID: <fed4ce78-37c5-4bb5-86de-6d60f053dbf3@amazon.com>
Date: Tue, 27 Jan 2026 09:47:43 +0100
From: Alexander Graf <graf@...zon.com>
To: Johannes Thumshirn <johannes.thumshirn@....com>,
	<virtualization@...ts.linux.dev>
CC: <mst@...hat.com>, <jasowang@...hat.com>, <xuanzhuo@...ux.alibaba.com>,
	<eperezma@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 0/3] virtio: silence KCSAN warnings

On 27.01.26 09:39, Johannes Thumshirn wrote:
> When booting a Qemu VM whith KCSAN to debug filesystem races I
> encountered a bunch of KCSAN splats in virtio.
>
> I suspect them to be false positives.
>
> I decided to send this as an RFC patchset, as I have no prior knowledge
> of virtio.

All of these looks like KCSAN was just detecting the hypervisor writing 
data. Is there a more generic way we can capture that in the virtio 
helpers? So instead of patching the consumers of functions such as 
vring_interrupt(), can we annotate the whole vring struct as "ignore for 
KCSAN"?

Alex

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