linux-kernel - RE: [PATCH v2 7/7] vfio/fsl-mc: Block calling interrupt handler without trigger

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Date: Mon, 11 Mar 2024 01:56:07 +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>, "diana.craciun@....nxp.com"
	<diana.craciun@....nxp.com>, "stable@...r.kernel.org"
	<stable@...r.kernel.org>
Subject: RE: [PATCH v2 7/7] vfio/fsl-mc: Block calling interrupt handler
 without trigger

> From: Alex Williamson <alex.williamson@...hat.com>
> Sent: Saturday, March 9, 2024 7:05 AM
> 
> The eventfd_ctx trigger pointer of the vfio_fsl_mc_irq object is
> initially NULL and may become NULL if the user sets the trigger
> eventfd to -1.  The interrupt handler itself is guaranteed that
> trigger is always valid between request_irq() and free_irq(), but
> the loopback testing mechanisms to invoke the handler function
> need to test the trigger.  The triggering and setting ioctl paths
> both make use of igate and are therefore mutually exclusive.
> 
> The vfio-fsl-mc driver does not make use of irqfds, nor does it
> support any sort of masking operations, therefore unlike vfio-pci
> and vfio-platform, the flow can remain essentially unchanged.
> 
> Cc: Diana Craciun <diana.craciun@....nxp.com>
> Cc: stable@...r.kernel.org
> Fixes: cc0ee20bd969 ("vfio/fsl-mc: trigger an interrupt via eventfd")
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

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