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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2015-02-27 11:25:51 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-01 19:29:05 -0800 |
| commit | e513229b4c386e6c9f66298c13fde92f73e6e1ac (patch) | |
| tree | aff1c8f388eb5260f1c91f6acaee54129c53a315 /drivers/dma/dma-jz4740.c | |
| parent | c517d838eb7d07bbe9507871fab3931deccff539 (diff) | |
| download | op-kernel-dev-e513229b4c386e6c9f66298c13fde92f73e6e1ac.zip op-kernel-dev-e513229b4c386e6c9f66298c13fde92f73e6e1ac.tar.gz | |
Drivers: hv: vmbus: prevent cpu offlining on newer hypervisors
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>
Diffstat (limited to 'drivers/dma/dma-jz4740.c')
0 files changed, 0 insertions, 0 deletions
