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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Alex Williamson <alex.williamson@redhat.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Sasha Levin <sashal@kernel.org>, yishaih@nvidia.com,
        mgurtovoy@nvidia.com, jgg@ziepe.ca, kvm@vger.kernel.org
Subject: [PATCH AUTOSEL 5.17 092/149] vfio/pci: Stub vfio_pci_vga_rw when !CONFIG_VFIO_PCI_VGA
Date:   Fri,  1 Apr 2022 10:24:39 -0400
Message-Id: <20220401142536.1948161-92-sashal@kernel.org>
In-Reply-To: <20220401142536.1948161-1-sashal@kernel.org>
References: <20220401142536.1948161-1-sashal@kernel.org>
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From: Alex Williamson <alex.williamson@redhat.com>

[ Upstream commit 6e031ec0e5a2dda53e12e0d2a7e9b15b47a3c502 ]

Resolve build errors reported against UML build for undefined
ioport_map() and ioport_unmap() functions.  Without this config
option a device cannot have vfio_pci_core_device.has_vga set,
so the existing function would always return -EINVAL anyway.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20220123125737.2658758-1-geert@linux-m68k.org
Link: https://lore.kernel.org/r/164306582968.3758255.15192949639574660648.stgit@omen
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/vfio/pci/vfio_pci_rdwr.c | 2 ++
 include/linux/vfio_pci_core.h    | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
index 57d3b2cbbd8e..82ac1569deb0 100644
--- a/drivers/vfio/pci/vfio_pci_rdwr.c
+++ b/drivers/vfio/pci/vfio_pci_rdwr.c
@@ -288,6 +288,7 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 	return done;
 }
 
+#ifdef CONFIG_VFIO_PCI_VGA
 ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 			       size_t count, loff_t *ppos, bool iswrite)
 {
@@ -355,6 +356,7 @@ ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 
 	return done;
 }
+#endif
 
 static void vfio_pci_ioeventfd_do_write(struct vfio_pci_ioeventfd *ioeventfd,
 					bool test_mem)
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index ef9a44b6cf5d..ae6f4838ab75 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -159,8 +159,17 @@ extern ssize_t vfio_pci_config_rw(struct vfio_pci_core_device *vdev,
 extern ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 			       size_t count, loff_t *ppos, bool iswrite);
 
+#ifdef CONFIG_VFIO_PCI_VGA
 extern ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 			       size_t count, loff_t *ppos, bool iswrite);
+#else
+static inline ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device *vdev,
+				      char __user *buf, size_t count,
+				      loff_t *ppos, bool iswrite)
+{
+	return -EINVAL;
+}
+#endif
 
 extern long vfio_pci_ioeventfd(struct vfio_pci_core_device *vdev, loff_t offset,
 			       uint64_t data, int count, int fd);
-- 
2.34.1