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Fri, 9 Oct 2026 17:57:16 -0400 (EDT) Date: Fri, 9 Oct 2026 15:57:15 -0600 From: Alex Williamson To: Jiale Yao Cc: Jason Gunthorpe , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, alex@shazbot.org Subject: Re: [PATCH] vfio/pci: Drain eventfd RCU callbacks on module exit Message-ID: <20261009155715.11f6d974@shazbot.org> In-Reply-To: <20261003093806.544631-1-yaojiale02@163.com> References: <20261003093806.544631-1-yaojiale02@163.com> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sat, 3 Oct 2026 17:38:06 +0800 Jiale Yao wrote: > vfio_pci_eventfd_replace_locked() defers freeing replaced eventfds to > vfio_pci_eventfd_rcu_free(). A callback can remain queued after > close_device() returns and the device driver module reference is dropped. > Once the dependent driver is removed, vfio-pci-core can be unloaded while > the callback still points into its module text. > > Wait for outstanding RCU callbacks before vfio-pci-core exits. > > Fixes: 98693e0897f7 ("vfio/pci: Use RCU for error/request triggers to avoid circular locking") > Signed-off-by: Jiale Yao > --- > drivers/vfio/pci/vfio_pci_core.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c > index 6757054e9d87..9bce419c52c8 100644 > --- a/drivers/vfio/pci/vfio_pci_core.c > +++ b/drivers/vfio/pci/vfio_pci_core.c > @@ -2675,6 +2675,7 @@ static void vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set) > static void vfio_pci_core_cleanup(void) > { > vfio_pci_uninit_perm_bits(); > + rcu_barrier(); > } > > static int __init vfio_pci_core_init(void) Applied to vfio next branch for v7.4. Thanks, Alex