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    SubjectRe: [PATCH v9 10/21] vfio/pci: introduce CONFIG_VFIO_PCI_ZDEV_KVM
    On Mon,  6 Jun 2022 16:33:14 -0400
    Matthew Rosato <mjrosato@linux.ibm.com> wrote:

    > The current contents of vfio-pci-zdev are today only useful in a KVM
    > environment; let's tie everything currently under vfio-pci-zdev to
    > this Kconfig statement and require KVM in this case, reducing complexity
    > (e.g. symbol lookups).
    >
    > Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
    > ---
    > drivers/vfio/pci/Kconfig | 11 +++++++++++
    > drivers/vfio/pci/Makefile | 2 +-
    > include/linux/vfio_pci_core.h | 2 +-
    > 3 files changed, 13 insertions(+), 2 deletions(-)


    Acked-by: Alex Williamson <alex.williamson@redhat.com>


    > diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
    > index 4da1914425e1..f9d0c908e738 100644
    > --- a/drivers/vfio/pci/Kconfig
    > +++ b/drivers/vfio/pci/Kconfig
    > @@ -44,6 +44,17 @@ config VFIO_PCI_IGD
    > To enable Intel IGD assignment through vfio-pci, say Y.
    > endif
    >
    > +config VFIO_PCI_ZDEV_KVM
    > + 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.
    > +
    > source "drivers/vfio/pci/mlx5/Kconfig"
    >
    > source "drivers/vfio/pci/hisilicon/Kconfig"
    > diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
    > index 7052ebd893e0..24c524224da5 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_KVM) += 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 23c176d4b073..63af2897939c 100644
    > --- a/include/linux/vfio_pci_core.h
    > +++ b/include/linux/vfio_pci_core.h
    > @@ -206,7 +206,7 @@ static inline int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
    > }
    > #endif
    >
    > -#ifdef CONFIG_S390
    > +#ifdef CONFIG_VFIO_PCI_ZDEV_KVM
    > extern int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
    > struct vfio_info_cap *caps);
    > #else

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