Re: [PATCH v2 23/30] vfio/pci: re-introduce CONFIG_VFIO_PCI_ZDEV

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





On 1/14/22 21:31, Matthew Rosato wrote:
This was previously removed as unnecessary; while that was true, subsequent
changes will make KVM an additional required component for vfio-pci-zdev.
Let's re-introduce CONFIG_VFIO_PCI_ZDEV as now there is actually a reason
to say 'n' for it (when not planning to CONFIG_KVM).

Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
  drivers/vfio/pci/Kconfig      | 11 +++++++++++
  drivers/vfio/pci/Makefile     |  2 +-
  include/linux/vfio_pci_core.h |  2 +-
  3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 860424ccda1b..fedd1d4cb592 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -42,5 +42,16 @@ config VFIO_PCI_IGD
  	  and LPC bridge config space.
To enable Intel IGD assignment through vfio-pci, say Y.
+
+config VFIO_PCI_ZDEV
+	bool "VFIO PCI extensions for s390x KVM passthrough"
+	depends on S390 && KVM
+	default y
+	help
+	  Support s390x-specific extensions to enable support for enhancements
+	  to KVM passthrough capabilities, such as interpretive execution of
+	  zPCI instructions.
+
+	  To enable s390x KVM vfio-pci extensions, say Y.

In several patches we check on CONFIG_PCI (14,15,16,17 and 22) but we may have PCI without VFIO_PCI, wouldn't it be a problem?

Here we define a new CONFIG entry and I have two questions:

1- there is no dependency on VFIO_PCI while the functionality is obviously based on VFIO_PCI

2- Wouldn't it be possible to use this item and the single condition for the different checks we need through the new VFIO interpretation functionality.




  endif
  endif
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 349d68d242b4..01b1f83d83d7 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -1,7 +1,7 @@
  # SPDX-License-Identifier: GPL-2.0-only
vfio-pci-core-y := vfio_pci_core.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
-vfio-pci-core-$(CONFIG_S390) += vfio_pci_zdev.o
+vfio-pci-core-$(CONFIG_VFIO_PCI_ZDEV) += vfio_pci_zdev.o
  obj-$(CONFIG_VFIO_PCI_CORE) += vfio-pci-core.o
vfio-pci-y := vfio_pci.o
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index ef9a44b6cf5d..5e2bca3b89db 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -195,7 +195,7 @@ static inline int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
  }
  #endif
-#ifdef CONFIG_S390
+#ifdef CONFIG_VFIO_PCI_ZDEV
  extern int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
  				       struct vfio_info_cap *caps);
  #else


--
Pierre Morel
IBM Lab Boeblingen



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux