linux-kernel - RE: [PATCH 3/7] vfio: Introduce interface to flush virqfd inject workqueue

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Date: Thu, 7 Mar 2024 08:58:25 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Alex Williamson <alex.williamson@...hat.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "clg@...hat.com" <clg@...hat.com>, "Chatre,
 Reinette" <reinette.chatre@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/7] vfio: Introduce interface to flush virqfd inject
 workqueue

> From: Alex Williamson <alex.williamson@...hat.com>
> Sent: Thursday, March 7, 2024 5:15 AM
> 
> In order to synchronize changes that can affect the thread callback,
> introduce an interface to force a flush of the inject workqueue.  The
> irqfd pointer is only valid under spinlock, but the workqueue cannot
> be flushed under spinlock.  Therefore the flush work for the irqfd is
> queued under spinlock.  The vfio_irqfd_cleanup_wq workqueue is re-used
> for queuing this work such that flushing the workqueue is also ordered
> relative to shutdown.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>