Re: [PATCH v2] vfio/pci: add msi interrupt affinity support

[Jason Gunthorpe]

On Wed, Jun 05, 2024 at 03:55:05PM +0000, Fred Griffoul wrote:
> The usual way to configure a device interrupt from userland is to write
> the /proc/irq/<irq>/smp_affinity or smp_affinity_list files. When using
> vfio to implement a device driver or a virtual machine monitor, this may
> not be ideal: the process managing the vfio device interrupts may not be
> granted root privilege, for security reasons. Thus it cannot directly
> control the interrupt affinity and has to rely on an external command.

For a long time I've been beating a drum that people need to stop
using /proc/irq/../smp_affinity, so I like this idea :)

Jason