[PATCH] vfio-pci/zdev: require KVM to be built-in

[Randy Dunlap]

Fix build errors when CONFIG_KVM=m:

s390-linux-ld: drivers/vfio/pci/vfio_pci_zdev.o: in function `vfio_pci_zdev_open_device':
vfio_pci_zdev.c:(.text+0x242): undefined reference to `kvm_s390_pci_register_kvm'
s390-linux-ld: drivers/vfio/pci/vfio_pci_zdev.o: in function `vfio_pci_zdev_close_device':
vfio_pci_zdev.c:(.text+0x296): undefined reference to `kvm_s390_pci_unregister_kvm'

Having a bool Kconfig symbol depend on a tristate symbol can often
lead to problems like this.

Fixes: 8061d1c31f1a ("vfio-pci/zdev: add open/close device hooks")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Cc: Eric Farman <farman@xxxxxxxxxxxxx>
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
---
 drivers/vfio/pci/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -46,7 +46,7 @@ endif
 
 config VFIO_PCI_ZDEV_KVM
 	bool "VFIO PCI extensions for s390x KVM passthrough"
-	depends on S390 && KVM
+	depends on S390 && KVM=y
 	default y
 	help
 	  Support s390x-specific extensions to enable support for enhancements