[PATCH] KVM: s390: pci: VFIO_PCI ZDEV configuration fix

Pierre Morel
2022-08-16T20:24:04Z

Fixing configuration for VFIO PCI interpretation.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Fixes: 09340b2fca007 ("KVM: s390: pci: add routines to start/stop inter..")
Fixes: c435c54639aa5 ("vfio/pci: introduce CONFIG_VFIO_PCI_ZDEV_KVM..")
Cc: <stable@vger.kernel.org>
---
arch/s390/include/asm/kvm_host.h | 9 ---------
arch/s390/kvm/Makefile | 2 +-
arch/s390/kvm/pci.c | 4 ++--
drivers/vfio/pci/Kconfig | 4 ++--
include/linux/vfio_pci_core.h | 2 +-
5 files changed, 6 insertions(+), 15 deletions(-)

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index f39092e0ceaa..f6cf961731af 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -1038,16 +1038,7 @@ static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
#define __KVM_HAVE_ARCH_VM_FREE
void kvm_arch_free_vm(struct kvm *kvm);

-#ifdef CONFIG_VFIO_PCI_ZDEV_KVM
int kvm_s390_pci_register_kvm(struct zpci_dev *zdev, struct kvm *kvm);
void kvm_s390_pci_unregister_kvm(struct zpci_dev *zdev);
-#else
-static inline int kvm_s390_pci_register_kvm(struct zpci_dev *dev,
- struct kvm *kvm)
-{
- return -EPERM;
-}
-static inline void kvm_s390_pci_unregister_kvm(struct zpci_dev *dev) {}
-#endif

#endif
diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
index 02217fb4ae10..be36afcfd6ff 100644
--- a/arch/s390/kvm/Makefile
+++ b/arch/s390/kvm/Makefile
@@ -9,6 +9,6 @@ ccflags-y := -Ivirt/kvm -Iarch/s390/kvm

kvm-y += kvm-s390.o intercept.o interrupt.o priv.o sigp.o
kvm-y += diag.o gaccess.o guestdbg.o vsie.o pv.o
+kvm-y += pci.o

-kvm-$(CONFIG_VFIO_PCI_ZDEV_KVM) += pci.o
obj-$(CONFIG_KVM) += kvm.o
diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
index 4946fb7757d6..cf8ab72a2109 100644
--- a/arch/s390/kvm/pci.c
+++ b/arch/s390/kvm/pci.c
@@ -435,7 +435,7 @@ int kvm_s390_pci_register_kvm(struct zpci_dev *zdev, struct kvm *kvm)
{
int rc;

- if (!zdev)
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || !zdev)
return -EINVAL;

mutex_lock(&zdev->kzdev_lock);
@@ -516,7 +516,7 @@ void kvm_s390_pci_unregister_kvm(struct zpci_dev *zdev)
{
struct kvm *kvm;

- if (!zdev)
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || !zdev)
return;

mutex_lock(&zdev->kzdev_lock);
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index f9d0c908e738..bbc375b028ef 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -45,9 +45,9 @@ config VFIO_PCI_IGD
endif

config VFIO_PCI_ZDEV_KVM
- bool "VFIO PCI extensions for s390x KVM passthrough"
+ def_tristate y
+ prompt "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
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index 5579ece4347b..7db3bb8129b1 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -205,7 +205,7 @@ static inline int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
}
#endif

-#ifdef CONFIG_VFIO_PCI_ZDEV_KVM
+#if IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)
int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
struct vfio_info_cap *caps);
int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev);
--
2.31.1