From: Niklas Schnelle <schnelle@linux.ibm.com>
To: Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Alex Williamson <alex.williamson@redhat.com>,
Gerd Bayer <gbayer@linux.ibm.com>,
Matthew Rosato <mjrosato@linux.ibm.com>,
Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, Niklas Schnelle <schnelle@linux.ibm.com>
Subject: [PATCH 3/3] vfio/pci: Enable VFIO_PCI_MMAP for s390
Date: Tue, 21 May 2024 14:14:59 +0200 [thread overview]
Message-ID: <20240521-vfio_pci_mmap-v1-3-2f6315e0054e@linux.ibm.com> (raw)
In-Reply-To: <20240521-vfio_pci_mmap-v1-0-2f6315e0054e@linux.ibm.com>
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@linux.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
next prev parent reply other threads:[~2024-05-21 12:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-21 12:14 [PATCH 0/3] vfio/pci: s390: Fix issues preventing VFIO_PCI_MMAP=y for s390 and enable it Niklas Schnelle
2024-05-21 12:14 ` [PATCH 1/3] s390/pci: Fix s390_mmio_read/write syscall page fault handling Niklas Schnelle
2024-05-22 23:18 ` Jason Gunthorpe
2024-05-21 12:14 ` [PATCH 2/3] vfio/pci: Tolerate oversized BARs by disallowing mmap Niklas Schnelle
2024-05-22 23:19 ` Jason Gunthorpe
2024-05-21 12:14 ` Niklas Schnelle [this message]
2024-05-22 23:20 ` [PATCH 3/3] vfio/pci: Enable VFIO_PCI_MMAP for s390 Jason Gunthorpe
2024-05-23 8:24 ` Niklas Schnelle
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