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Message-Id: <1564183046-128211-3-git-send-email-nudasnev@microsoft.com>
Date: Fri, 26 Jul 2019 16:17:26 -0700
From: Nuno Das Neves <nudasnev@...rosoft.com>
To: nudasnev@...rosoft.com, gregkh@...uxfoundation.org,
sthemmin@...rosoft.com, Alexander.Levin@...rosoft.com,
haiyangz@...rosoft.com, kys@...rosoft.com, mikelley@...rosoft.com
Cc: linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/2] sys-hypervisor: version information for Hyper-V
This patch introduces the /sys/hypervisor/version directory, which contains
files with version information about the underlying Windows hypervisor, namely:
major, minor, build_number, service_number, service_pack, service_branch
Signed-off-by: Nuno Das Neves <nudasnev@...rosoft.com>
---
.../ABI/stable/sysfs-hypervisor-hyperv | 54 ++++++++++
drivers/hv/sys-hypervisor.c | 102 ++++++++++++++++++
2 files changed, 156 insertions(+)
diff --git a/Documentation/ABI/stable/sysfs-hypervisor-hyperv b/Documentation/ABI/stable/sysfs-hypervisor-hyperv
index 58380ea81315..9bb50e37b083 100644
--- a/Documentation/ABI/stable/sysfs-hypervisor-hyperv
+++ b/Documentation/ABI/stable/sysfs-hypervisor-hyperv
@@ -5,3 +5,57 @@ Contact: linux-hyperv@...r.kernel.org
Description: If running under Hyper-V:
Type of hypervisor:
"Hyper-V": Hyper-V hypervisor
+
+What: /sys/hypervisor/version/major
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@...r.kernel.org
+Description: If running under Hyper-V:
+ The Hyper-V version is in the format:
+ <major>.<minor>.<build_number>.<service_number>-<service_pack>-<service_branch>
+ This is the <major> part of it.
+
+What: /sys/hypervisor/version/minor
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@...r.kernel.org
+Description: If running under Hyper-V:
+ The Hyper-V version is in the format:
+ <major>.<minor>.<build_number>.<service_number>-<service_pack>-<service_branch>
+ This is the <minor> part of it.
+
+What: /sys/hypervisor/version/build_number
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@...r.kernel.org
+Description: If running under Hyper-V:
+ The Hyper-V version is in the format:
+ <major>.<minor>.<build_number>.<service_number>-<service_pack>-<service_branch>
+ This is the <build_number> part of it.
+
+What: /sys/hypervisor/version/service_number
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@...r.kernel.org
+Description: If running under Hyper-V:
+ The Hyper-V version is in the format:
+ <major>.<minor>.<build_number>.<service_number>-<service_pack>-<service_branch>
+ This is the <service_number> part of it.
+
+What: /sys/hypervisor/version/service_pack
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@...r.kernel.org
+Description: If running under Hyper-V:
+ The Hyper-V version is in the format:
+ <major>.<minor>.<build_number>.<service_number>-<service_pack>-<service_branch>
+ This is the <service_pack> part of it.
+
+What: /sys/hypervisor/version/service_branch
+Date: July 2019
+KernelVersion: 5.2.1
+Contact: linux-hyperv@...r.kernel.org
+Description: If running under Hyper-V:
+ The Hyper-V version is in the format:
+ <major>.<minor>.<build_number>.<service_number>-<service_pack>-<service_branch>
+ This is the <service_branch> part of it.
diff --git a/drivers/hv/sys-hypervisor.c b/drivers/hv/sys-hypervisor.c
index eb3d2a6502c4..d157636c2db9 100644
--- a/drivers/hv/sys-hypervisor.c
+++ b/drivers/hv/sys-hypervisor.c
@@ -10,7 +10,9 @@
#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/err.h>
+#include <linux/processor.h>
+#include <asm/hyperv-tlfs.h>
#include <asm/hypervisor.h>
static ssize_t type_show(struct kobject *obj,
@@ -27,6 +29,95 @@ static int __init hyperv_sysfs_type_init(void)
return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
}
+/* version info */
+
+static ssize_t major_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION);
+
+ return sprintf(buf, "%u\n", hv_host_info_ebx >> 16);
+}
+
+static struct kobj_attribute major_attr = __ATTR_RO(major);
+
+static ssize_t minor_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION);
+
+ return sprintf(buf, "%u\n", hv_host_info_ebx & 0xFFFF);
+}
+
+static struct kobj_attribute minor_attr = __ATTR_RO(minor);
+
+static ssize_t build_number_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int hv_host_info_eax = cpuid_eax(HYPERV_CPUID_VERSION);
+
+ return sprintf(buf, "%u\n", hv_host_info_eax);
+}
+
+static struct kobj_attribute build_number_attr = __ATTR_RO(build_number);
+
+static ssize_t service_number_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int hv_host_info_edx = cpuid_edx(HYPERV_CPUID_VERSION);
+
+ return sprintf(buf, "%u\n", hv_host_info_edx & 0xFFFFFF);
+}
+
+static struct kobj_attribute service_number_attr = __ATTR_RO(service_number);
+
+static ssize_t service_pack_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int hv_host_info_ecx = cpuid_ecx(HYPERV_CPUID_VERSION);
+
+ return sprintf(buf, "%u\n", hv_host_info_ecx);
+}
+
+static struct kobj_attribute service_pack_attr = __ATTR_RO(service_pack);
+
+static ssize_t service_branch_show(struct kobject *obj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned int hv_host_info_edx = cpuid_edx(HYPERV_CPUID_VERSION);
+
+ return sprintf(buf, "%u\n", hv_host_info_edx >> 24);
+}
+
+static struct kobj_attribute service_branch_attr = __ATTR_RO(service_branch);
+
+static struct attribute *version_attrs[] = {
+ &major_attr.attr,
+ &minor_attr.attr,
+ &build_number_attr.attr,
+ &service_number_attr.attr,
+ &service_pack_attr.attr,
+ &service_branch_attr.attr,
+ NULL
+};
+
+static const struct attribute_group version_group = {
+ .name = "version",
+ .attrs = version_attrs,
+};
+
+static int __init hyperv_sysfs_version_init(void)
+{
+ return sysfs_create_group(hypervisor_kobj, &version_group);
+}
+
+
static int __init hyper_sysfs_init(void)
{
int ret;
@@ -35,7 +126,18 @@ static int __init hyper_sysfs_init(void)
return -ENODEV;
ret = hyperv_sysfs_type_init();
+ if (ret)
+ goto out;
+
+ ret = hyperv_sysfs_version_init();
+ if (ret)
+ goto version_out;
+
+ goto out;
+version_out:
+ sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
+out:
return ret;
}
device_initcall(hyper_sysfs_init);
--
2.17.1
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