Re: [PATCH 3/3] vfio/pci: Enable VFIO_PCI_MMAP for s390

[Jason Gunthorpe]

On Tue, May 21, 2024 at 02:14:59PM +0200, Niklas Schnelle wrote:
> With the introduction of memory I/O (MIO) instructions enbaled in commit
> 71ba41c9b1d9 ("s390/pci: provide support for MIO instructions") s390
> gained support for direct user-space access to mapped PCI resources.
> Even without those however user-space can access mapped PCI resources
> via the s390 specific MMIO syscalls. Thus VFIO_PCI_MMAP can be enabled
> on all s390 systems with native PCI allowing vfio-pci user-space
> applications direct access to mapped resources.
> 
> Link: https://lore.kernel.org/all/c5ba134a1d4f4465b5956027e6a4ea6f6beff969.camel@xxxxxxxxxxxxx/
> Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
> ---
>  drivers/vfio/pci/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
> index 15821a2d77d2..814aa0941d61 100644
> --- a/drivers/vfio/pci/Kconfig
> +++ b/drivers/vfio/pci/Kconfig
> @@ -8,7 +8,7 @@ config VFIO_PCI_CORE
>  	select IRQ_BYPASS_MANAGER
>  
>  config VFIO_PCI_MMAP
> -	def_bool y if !S390
> +	def_bool y
>  	depends on VFIO_PCI_CORE

Should we just purge this kconfig entirely? It is never meaningfully n now?

Jason