Hello Fred. On Mon, Jun 10, 2024 at 12:57:06PM GMT, Fred Griffoul <fgriffo@xxxxxxxxxxxx> 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. External commands something privileged? (I'm curious of an example how this is setup.) > The affinity argument must be a subset of the process cpuset, otherwise > an error -EPERM is returned. I'm not sure you want to look at task's cpuset mask for this purposes. Consider setups without cpuset or a change of (cpuset) mask anytime during lifetime of the task... Michal
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