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Subject[RFC PATCH 1/2] sys-hypervisor: /sys/hypervisor/type for Hyper-V
Date
Populate /sys/hypervisor with entries for Hyper-V.
This patch adds /sys/hypervisor/type which contains "Hyper-V".

Signed-off-by: Nuno Das Neves <nudasnev@microsoft.com>
---
.../ABI/stable/sysfs-hypervisor-hyperv | 7 ++++
drivers/hv/Kconfig | 10 +++++
drivers/hv/Makefile | 7 ++--
drivers/hv/sys-hypervisor.c | 41 +++++++++++++++++++
4 files changed, 62 insertions(+), 3 deletions(-)
create mode 100644 Documentation/ABI/stable/sysfs-hypervisor-hyperv
create mode 100644 drivers/hv/sys-hypervisor.c

diff --git a/Documentation/ABI/stable/sysfs-hypervisor-hyperv b/Documentation/ABI/stable/sysfs-hypervisor-hyperv
new file mode 100644
index 000000000000..58380ea81315
--- /dev/null
+++ b/Documentation/ABI/stable/sysfs-hypervisor-hyperv
@@ -0,0 +1,7 @@
+What: /sys/hypervisor/type
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@vger.kernel.org
+Description: If running under Hyper-V:
+ Type of hypervisor:
+ "Hyper-V": Hyper-V hypervisor
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 1c1a2514d6f3..e693adf0b77f 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -25,4 +25,14 @@ config HYPERV_BALLOON
help
Select this option to enable Hyper-V Balloon driver.

+config HYPERV_SYS_HYPERVISOR
+ bool "Create Hyper-V entries under /sys/hypervisor"
+ depends on HYPERV && SYSFS
+ select SYS_HYPERVISOR
+ default y
+ help
+ Create Hyper-V entries under /sys/hypervisor (e.g., type). When running
+ native or on another hypervisor, /sys/hypervisor may still be
+ present, but it will have no Hyper-V entries.
+
endmenu
diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile
index a1eec7177c2d..87f569659555 100644
--- a/drivers/hv/Makefile
+++ b/drivers/hv/Makefile
@@ -1,7 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_HYPERV) += hv_vmbus.o
-obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
-obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
+obj-$(CONFIG_HYPERV) += hv_vmbus.o
+obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
+obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
+obj-$(CONFIG_HYPERV_SYS_HYPERVISOR) += sys-hypervisor.o

CFLAGS_hv_trace.o = -I$(src)
CFLAGS_hv_balloon.o = -I$(src)
diff --git a/drivers/hv/sys-hypervisor.c b/drivers/hv/sys-hypervisor.c
new file mode 100644
index 000000000000..eb3d2a6502c4
--- /dev/null
+++ b/drivers/hv/sys-hypervisor.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright (C) 2019, Microsoft, Inc.
+ *
+ * Authored by: Nuno Das Neves <nudasnev@microsoft.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kobject.h>
+#include <linux/err.h>
+
+#include <asm/hypervisor.h>
+
+static ssize_t type_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "Hyper-V\n");
+}
+
+static struct kobj_attribute type_attr = __ATTR_RO(type);
+
+static int __init hyperv_sysfs_type_init(void)
+{
+ return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
+}
+
+static int __init hyper_sysfs_init(void)
+{
+ int ret;
+
+ if (!hypervisor_is_type(X86_HYPER_MS_HYPERV))
+ return -ENODEV;
+
+ ret = hyperv_sysfs_type_init();
+
+ return ret;
+}
+device_initcall(hyper_sysfs_init);
--
2.17.1
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