diff options
| -rw-r--r-- | Documentation/ABI/stable/sysfs-bus-vmbus | 7 | ||||
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 18 |
2 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-bus-vmbus b/Documentation/ABI/stable/sysfs-bus-vmbus index c27b7b89477c..42599d9fa161 100644 --- a/Documentation/ABI/stable/sysfs-bus-vmbus +++ b/Documentation/ABI/stable/sysfs-bus-vmbus @@ -1,3 +1,10 @@ +What: /sys/bus/vmbus/hibernation +Date: Jan 2021 +KernelVersion: 5.12 +Contact: Dexuan Cui <decui@microsoft.com> +Description: Whether the host supports hibernation for the VM. +Users: Daemon that sets up swap partition/file for hibernation. + What: /sys/bus/vmbus/devices/<UUID>/id Date: Jul 2009 KernelVersion: 2.6.31 diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 4b0f2065a4bd..65535c32662d 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -678,6 +678,23 @@ static const struct attribute_group vmbus_dev_group = { }; __ATTRIBUTE_GROUPS(vmbus_dev); +/* Set up the attribute for /sys/bus/vmbus/hibernation */ +static ssize_t hibernation_show(struct bus_type *bus, char *buf) +{ + return sprintf(buf, "%d\n", !!hv_is_hibernation_supported()); +} + +static BUS_ATTR_RO(hibernation); + +static struct attribute *vmbus_bus_attrs[] = { + &bus_attr_hibernation.attr, + NULL, +}; +static const struct attribute_group vmbus_bus_group = { + .attrs = vmbus_bus_attrs, +}; +__ATTRIBUTE_GROUPS(vmbus_bus); + /* * vmbus_uevent - add uevent for our device * @@ -1024,6 +1041,7 @@ static struct bus_type hv_bus = { .uevent = vmbus_uevent, .dev_groups = vmbus_dev_groups, .drv_groups = vmbus_drv_groups, + .bus_groups = vmbus_bus_groups, .pm = &vmbus_pm, }; |