linux-kernel - [PATCH] vfio: fix virtio-pci dependency

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Date: Tue,  9 Jan 2024 08:57:19 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Yishai Hadas <yishaih@...dia.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Jason Gunthorpe <jgg@...pe.ca>
Cc: Arnd Bergmann <arnd@...db.de>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] vfio: fix virtio-pci dependency

From: Arnd Bergmann <arnd@...db.de>

The new vfio-virtio driver already has a dependency on VIRTIO_PCI_ADMIN_LEGACY,
but that is a bool symbol and allows vfio-virtio to be built-in even if
virtio-pci itself is a loadable module. This leads to a link failure:

aarch64-linux-ld: drivers/vfio/pci/virtio/main.o: in function `virtiovf_pci_probe':
main.c:(.text+0xec): undefined reference to `virtio_pci_admin_has_legacy_io'
aarch64-linux-ld: drivers/vfio/pci/virtio/main.o: in function `virtiovf_pci_init_device':
main.c:(.text+0x260): undefined reference to `virtio_pci_admin_legacy_io_notify_info'
aarch64-linux-ld: drivers/vfio/pci/virtio/main.o: in function `virtiovf_pci_bar0_rw':
main.c:(.text+0x6ec): undefined reference to `virtio_pci_admin_legacy_common_io_read'
aarch64-linux-ld: main.c:(.text+0x6f4): undefined reference to `virtio_pci_admin_legacy_device_io_read'
aarch64-linux-ld: main.c:(.text+0x7f0): undefined reference to `virtio_pci_admin_legacy_common_io_write'
aarch64-linux-ld: main.c:(.text+0x7f8): undefined reference to `virtio_pci_admin_legacy_device_io_write'

Add another explicit dependency on the tristate symbol.

Fixes: eb61eca0e8c3 ("vfio/virtio: Introduce a vfio driver over virtio devices")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/vfio/pci/virtio/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/virtio/Kconfig b/drivers/vfio/pci/virtio/Kconfig
index fc3a0be9d8d4..bd80eca4a196 100644
--- a/drivers/vfio/pci/virtio/Kconfig
+++ b/drivers/vfio/pci/virtio/Kconfig
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config VIRTIO_VFIO_PCI
         tristate "VFIO support for VIRTIO NET PCI devices"
-        depends on VIRTIO_PCI_ADMIN_LEGACY
+        depends on VIRTIO_PCI && VIRTIO_PCI_ADMIN_LEGACY
         select VFIO_PCI_CORE
         help
           This provides support for exposing VIRTIO NET VF devices which support
-- 
2.39.2