linux-kernel - Re: [PATCH] vsock/virtio: use GFP

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Message-ID: <20241007083920.185578a7@kernel.org>
Date: Mon, 7 Oct 2024 08:39:20 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, Christian Brauner <brauner@...nel.org>,
 Stefano Garzarella <sgarzare@...hat.com>, Luigi Leonardi
 <luigi.leonardi@...look.com>, Jason Wang <jasowang@...hat.com>, Xuan Zhuo
 <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Marco Pinna <marco.pinn95@...il.com>,
 virtualization@...ts.linux.dev, kvm@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] vsock/virtio: use GFP_ATOMIC under RCU read lock

On Wed, 2 Oct 2024 09:41:42 -0400 Michael S. Tsirkin wrote:
> virtio_transport_send_pkt in now called on transport fast path,
> under RCU read lock. In that case, we have a bug: virtio_add_sgs
> is called with GFP_KERNEL, and might sleep.
> 
> Pass the gfp flags as an argument, and use GFP_ATOMIC on
> the fast path.

Hi Michael! The To: linux-kernel@...r.kernel.org doesn't give much info
on who you expect to apply this ;) Please let us know if you plan to
take it via your own tree, otherwise we'll ship it to Linus on Thu.