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
config VFIO_PCI_INTX
--
2.40.1
