From: Dexuan Cui decui@microsoft.com Sent: Friday, April 10, 2020 10:08 PM
Before the hibernation patchset (e.g. f53335e3289f), in a Generation-2 Linux VM on Hyper-V, the user can run "echo freeze > /sys/power/state" to freeze the system, i.e. Suspend-to-Idle. The user can press the keyboard or move the mouse to wake up the VM.
With the hibernation patchset, Linux VM on Hyper-V can hibernate to disk, but Suspend-to-Idle is broken: when the synthetic keyboard/mouse are suspended, there is no way to wake up the VM.
Fix the issue by not suspending and resuming the vmbus devices upon Suspend-to-Idle.
Fixes: f53335e3289f ("Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation") Cc: stable@vger.kernel.org Signed-off-by: Dexuan Cui decui@microsoft.com
Changes in v2: Added "#define vmbus_suspend NULL", etc. for the case where CONFIG_PM_SLEEP is not defined. Many thanks to kbuild test robot lkp@intel.com for this!
drivers/hv/vmbus_drv.c | 43 ++++++++++++++++++++++++++++++++++--------- 1 file changed, 34 insertions(+), 9 deletions(-)
Reviewed-by: Michael Kelley mikelley@microsoft.com