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From: Stefan Hajnoczi <stefanha@gmail.com>
To: Stefano Garzarella <sgarzare@redhat.com>
Cc: netdev@vger.kernel.org, kvm@vger.kernel.org,
	"Michael S . Tsirkin" <mst@redhat.com>,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	Stefan Hajnoczi <stefanha@redhat.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 0/4] vsock/virtio: several fixes in the .probe() and .remove()
Date: Mon, 10 Jun 2019 14:09:45 +0100	[thread overview]
Message-ID: <20190610130945.GL14257@stefanha-x1.localdomain> (raw)
In-Reply-To: <20190528105623.27983-1-sgarzare@redhat.com>

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On Tue, May 28, 2019 at 12:56:19PM +0200, Stefano Garzarella wrote:
> During the review of "[PATCH] vsock/virtio: Initialize core virtio vsock
> before registering the driver", Stefan pointed out some possible issues
> in the .probe() and .remove() callbacks of the virtio-vsock driver.
> 
> This series tries to solve these issues:
> - Patch 1 postpones the 'the_virtio_vsock' assignment at the end of the
>   .probe() to avoid that some sockets queue works when the initialization
>   is not finished.
> - Patches 2 and 3 stop workers before to call vdev->config->reset(vdev) to
>   be sure that no one is accessing the device, and adds another flush at the
>   end of the .remove() to avoid use after free.
> - Patch 4 free also used buffers in the virtqueues during the .remove().
> 
> Stefano Garzarella (4):
>   vsock/virtio: fix locking around 'the_virtio_vsock'
>   vsock/virtio: stop workers during the .remove()
>   vsock/virtio: fix flush of works during the .remove()
>   vsock/virtio: free used buffers during the .remove()
> 
>  net/vmw_vsock/virtio_transport.c | 105 ++++++++++++++++++++++++++-----
>  1 file changed, 90 insertions(+), 15 deletions(-)

Looking forward to v2.  I took a look at the discussion and I'll review
v2 from scratch.  Just keep in mind that the mutex is used more for
mutual exclusion of the init/exit code than to protect the_virtio_vsock,
so we'll still need protection of init/exit code even with RCU.

Stefan

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  parent reply	other threads:[~2019-06-10 13:09 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-28 10:56 Stefano Garzarella
2019-05-28 10:56 ` [PATCH 1/4] vsock/virtio: fix locking around 'the_virtio_vsock' Stefano Garzarella
2019-05-30  4:28   ` David Miller
2019-05-30 10:27     ` Stefano Garzarella
2019-05-28 10:56 ` [PATCH 2/4] vsock/virtio: stop workers during the .remove() Stefano Garzarella
2019-05-28 10:56 ` [PATCH 3/4] vsock/virtio: fix flush of works " Stefano Garzarella
2019-05-29  3:22   ` Jason Wang
2019-05-29 10:58     ` Stefano Garzarella
2019-05-30  9:46       ` Jason Wang
2019-05-30 10:10         ` Stefano Garzarella
2019-05-30 11:59           ` Jason Wang
2019-05-31  8:18             ` Stefano Garzarella
2019-05-31  9:56               ` Jason Wang
2019-06-06  8:11                 ` Stefano Garzarella
2019-06-13  8:57                   ` Jason Wang
2019-06-27 10:26                     ` Stefano Garzarella
2019-05-28 10:56 ` [PATCH 4/4] vsock/virtio: free used buffers " Stefano Garzarella
2019-06-10 13:09 ` Stefan Hajnoczi [this message]
2019-06-27 10:05   ` [PATCH 0/4] vsock/virtio: several fixes in the .probe() and .remove() Stefano Garzarella

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