[PATCH 1/2] eal/linux: fix VFIO hotplug with multiprocess

[Maxime Coquelin]

On 9/16/24 14:30, David Marchand wrote:
> At the moment, if VFIO is not available at DPDK init, it won't be
> available unless a subsequent rte_vfio_enable() is done.
> 
> Yet, even if rte_vfio_enable() is called again in primary and secondary
> processes, a secondary process will never get to know that VFIO has been
> enabled in the primary process as the MP requests handler is only
> registered in EAL init.
> 
> On the other hand, moving the MP requests handler registration earlier
> in EAL init is ok, as secondary process are supposed to be waiting on
> eal_mcfg_wait_complete() until the primary process calls
> eal_mcfg_complete().
> 
> Move vfio_mp_sync_setup() in rte_vfio_enable().
> 
> Besides, rte_eal_vfio_setup() is useless and its name with a rte_ prefix
> is ambiguous as it gives the impression it is an exported/public symbol.
> Remove it and directly call rte_vfio_enable() where needed.
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---
>   lib/eal/linux/eal.c      | 18 +-----------------
>   lib/eal/linux/eal_vfio.c |  9 ++++++---
>   2 files changed, 7 insertions(+), 20 deletions(-)
> 

Should it be considered as a fix, and so a candidate for stable?
Or do you think it is too risky to change the behaviour?

Other than that, it looks good to me:
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime