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From:   Pierre Morel <pmorel@linux.ibm.com>
To:     mjrosato@linux.ibm.com
Cc:     rdunlap@infradead.org, linux-kernel@vger.kernel.org, lkp@intel.com,
        borntraeger@linux.ibm.com, farman@linux.ibm.com,
        linux-s390@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH] KVM: s390: pci: VFIO_PCI ZDEV configuration fix
Date:   Tue, 16 Aug 2022 22:28:55 +0200
Message-Id: <20220816202855.189410-1-pmorel@linux.ibm.com>
In-Reply-To: <1f2dd65e-b79b-44df-cc6a-8b3aa8fd61af@linux.ibm.com>
References: <1f2dd65e-b79b-44df-cc6a-8b3aa8fd61af@linux.ibm.com>
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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