linux-kernel - [PATCH 3/3] vfio/pci: Enable VFIO_PCI

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Message-Id: <20240521-vfio_pci_mmap-v1-3-2f6315e0054e@linux.ibm.com>
Date: Tue, 21 May 2024 14:14:59 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Niklas Schnelle <schnelle@...ux.ibm.com>
Subject: [PATCH 3/3] vfio/pci: Enable VFIO_PCI_MMAP for s390

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@linux.ibm.com/
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 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