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

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Date:   Sun, 14 Aug 2022 14:51:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH] vfio-pci/zdev: require KVM to be built-in

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@...radead.org>
Reported-by: kernel test robot <lkp@...el.com>
Cc: Matthew Rosato <mjrosato@...ux.ibm.com>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc: Pierre Morel <pmorel@...ux.ibm.com>
Cc: Eric Farman <farman@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org
Cc: kvm@...r.kernel.org
---
 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