diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2015-02-27 11:25:51 -0800 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2016-04-11 11:01:20 +0100 |
| commit | dbd0c7110bbb26a8f36bf0578555214e64911274 (patch) | |
| tree | 1c7a84412df286bab6393cc79a69b0f8baf4b1ff /include/linux/memory.h | |
| parent | 024eedbdd9cf1ef4c7b9600f1c271905adb911cf (diff) | |
Drivers: hv: vmbus: prevent cpu offlining on newer hypervisors
commit e513229b4c386e6c9f66298c13fde92f73e6e1ac upstream.
When an SMP Hyper-V guest is running on top of 2012R2 Server and secondary
cpus are sent offline (with echo 0 > /sys/devices/system/cpu/cpu$cpu/online)
the system freeze is observed. This happens due to the fact that on newer
hypervisors (Win8, WS2012R2, ...) vmbus channel handlers are distributed
across all cpus (see init_vp_index() function in drivers/hv/channel_mgmt.c)
and on cpu offlining nobody reassigns them to CPU0. Prevent cpu offlining
when vmbus is loaded until the issue is fixed host-side.
This patch also disables hibernation but it is OK as it is also broken (MCE
error is hit on resume). Suspend still works.
Tested with WS2008R2 and WS2012R2.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Chas Williams <3chas3@gmail.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'include/linux/memory.h')
0 files changed, 0 insertions, 0 deletions