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Subject[PATCH 03/19] drivers/hv: minimal mshv module (/dev/mshv/)
Date
Introduce a barebones module file for the mshv API.
Introduce CONFIG_HYPERV_ROOT_API for controlling compilation of mshv.

Co-developed-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
Signed-off-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
---
arch/x86/hyperv/Makefile | 1 +
drivers/hv/Kconfig | 18 ++++++++++
drivers/hv/Makefile | 3 ++
drivers/hv/mshv_main.c | 74 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 96 insertions(+)
create mode 100644 drivers/hv/mshv_main.c

diff --git a/arch/x86/hyperv/Makefile b/arch/x86/hyperv/Makefile
index 48e2c51464e8..4b5a8a96ba01 100644
--- a/arch/x86/hyperv/Makefile
+++ b/arch/x86/hyperv/Makefile
@@ -5,3 +5,4 @@ obj-$(CONFIG_X86_64) += hv_apic.o hv_proc.o
ifdef CONFIG_X86_64
obj-$(CONFIG_PARAVIRT_SPINLOCKS) += hv_spinlock.o
endif
+
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 66c794d92391..d618b1fab2bb 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -27,4 +27,22 @@ config HYPERV_BALLOON
help
Select this option to enable Hyper-V Balloon driver.

+config HYPERV_ROOT_API
+ tristate "Microsoft Hypervisor root partition interfaces: /dev/mshv"
+ depends on HYPERV
+ help
+ Provides access to interfaces for managing guest virtual machines
+ running under the Microsoft Hypervisor.
+
+ These interfaces will only work when Linux is running as root
+ partition on the Microsoft Hypervisor.
+
+ The interfaces are provided via a device named /dev/mshv.
+
+ To compile this as a module, choose M here.
+ The module is named mshv.
+
+ If unsure, say N.
+
+
endmenu
diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile
index 94daf8240c95..c943fbeb70e7 100644
--- a/drivers/hv/Makefile
+++ b/drivers/hv/Makefile
@@ -2,6 +2,7 @@
obj-$(CONFIG_HYPERV) += hv_vmbus.o
obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
+obj-$(CONFIG_HYPERV_ROOT_API) += mshv.o

CFLAGS_hv_trace.o = -I$(src)
CFLAGS_hv_balloon.o = -I$(src)
@@ -11,3 +12,5 @@ hv_vmbus-y := vmbus_drv.o \
channel_mgmt.o ring_buffer.o hv_trace.o
hv_vmbus-$(CONFIG_HYPERV_TESTING) += hv_debugfs.o
hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_fcopy.o hv_utils_transport.o
+
+mshv-y += mshv_main.o
diff --git a/drivers/hv/mshv_main.c b/drivers/hv/mshv_main.c
new file mode 100644
index 000000000000..c68cc84fb983
--- /dev/null
+++ b/drivers/hv/mshv_main.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020, Microsoft Corporation.
+ *
+ * Authors:
+ * Nuno Das Neves <nudasnev@microsoft.com>
+ * Lillian Grassin-Drake <ligrassi@microsoft.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+
+MODULE_AUTHOR("Microsoft");
+MODULE_LICENSE("GPL");
+
+static int mshv_dev_open(struct inode *inode, struct file *filp);
+static int mshv_dev_release(struct inode *inode, struct file *filp);
+static long mshv_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);
+
+static const struct file_operations mshv_dev_fops = {
+ .owner = THIS_MODULE,
+ .open = mshv_dev_open,
+ .release = mshv_dev_release,
+ .unlocked_ioctl = mshv_dev_ioctl,
+ .llseek = noop_llseek,
+};
+
+static struct miscdevice mshv_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "mshv",
+ .fops = &mshv_dev_fops,
+ .mode = 600,
+};
+
+static long
+mshv_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
+{
+ return -ENOTTY;
+}
+
+static int
+mshv_dev_open(struct inode *inode, struct file *filp)
+{
+ return 0;
+}
+
+static int
+mshv_dev_release(struct inode *inode, struct file *filp)
+{
+ return 0;
+}
+
+static int
+__init mshv_init(void)
+{
+ int ret;
+
+ ret = misc_register(&mshv_dev);
+ if (ret)
+ pr_err("%s: misc device register failed\n", __func__);
+
+ return ret;
+}
+
+static void
+__exit mshv_exit(void)
+{
+ misc_deregister(&mshv_dev);
+}
+
+module_init(mshv_init);
+module_exit(mshv_exit);
--
2.25.1
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