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 <[email protected]> --- .../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: [email protected] 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: [email protected] +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: [email protected] +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: [email protected] +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: [email protected] +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: [email protected] +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: [email protected] +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
