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

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Message-ID: <20241007114637-mutt-send-email-mst@kernel.org>
Date: Mon, 7 Oct 2024 11:46:59 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>
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 Mon, Oct 07, 2024 at 08:39:20AM -0700, Jakub Kicinski wrote:
> 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.

Hi!
It's in my tree, was in the process of sending a pull request actually.