From 54e19d34011fea26d39aa74781131de0ce642a01 Mon Sep 17 00:00:00 2001 From: Dexuan Cui Date: Sat, 25 Jan 2020 21:49:44 -0800 Subject: hv_utils: Add the support of hibernation Add util_pre_suspend() and util_pre_resume() for some hv_utils devices (e.g. kvp/vss/fcopy), because they need special handling before util_suspend() calls vmbus_close(). For kvp, all the possible pending work items should be cancelled. For vss and fcopy, some extra clean-up needs to be done, i.e. fake a THAW message for hv_vss_daemon and fake a CANCEL_FCOPY message for hv_fcopy_daemon, otherwise when the VM resums back, the daemons can end up in an inconsistent state (i.e. the file systems are frozen but will never be thawed; the file transmitted via fcopy may not be complete). Note: there is an extra patch for the daemons: "Tools: hv: Reopen the devices if read() or write() returns errors", because the hv_utils driver can not guarantee the whole transaction finishes completely once util_suspend() starts to run (at this time, all the userspace processes are frozen). util_probe() disables channel->callback_event to avoid the race with the channel callback. Signed-off-by: Dexuan Cui Reviewed-by: Michael Kelley Signed-off-by: Sasha Levin --- include/linux/hyperv.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/hyperv.h') diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 41c58011431e..692c89ccf5df 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1435,6 +1435,8 @@ struct hv_util_service { void (*util_cb)(void *); int (*util_init)(struct hv_util_service *); void (*util_deinit)(void); + int (*util_pre_suspend)(void); + int (*util_pre_resume)(void); }; struct vmbuspipe_hdr { -- cgit v1.2.3-59-g8ed1b