When a Linux VM runs on Hyper-V, if the host toolstack doesn't support hibernation for the VM (this happens on old Hyper-V hosts like Windows Server 2016, or new Hyper-V hosts if the admin or user doesn't declare the hibernation intent for the VM), the VM is discouraged from trying hibernation (because the host doesn't guarantee that the VM's virtual hardware configuration will remain exactly the same across hibernation), i.e. the VM should not try to set up the swap partition/file for hibernation, etc. x86 Hyper-V uses the presence of the virtual ACPI S4 state as the indication of the host toolstack support for a VM. Currently there is no easy and reliable way for the userspace to detect the presence of the state (see https://lkml.org/lkml/2020/12/11/1097). Add /sys/bus/vmbus/hibernation for this purpose. Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> --- This v3 is similar to v1, and the changes are: Updated the documentation changes. Updated the commit log. /sys/bus/vmbus/supported_features -> /sys/bus/vmbus/hibernation The patch is targeted at the Hyper-V tree's hyperv-next branch. Documentation/ABI/stable/sysfs-bus-vmbus | 7 +++++++ drivers/hv/vmbus_drv.c | 18 ++++++++++++++++++ 2 files changed, 25 insertions(+) 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@xxxxxxxxxxxxx> +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 d491fdcee61f..4c544473b1d9 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, }; -- 2.19.1
