This fixes the recent commit:
Drivers: hv: vmbus: Further improve CPU affiliation logic
Without the fix, reloading hv_netvsc hangs the guest.
Signed-off-by: Dexuan Cui <de...@microsoft.com>
---
drivers/hv/channel_mgmt.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 2f9aead..f61bd07 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -458,6 +458,19 @@ static void init_vp_index(struct vmbus_channel *channel,
const uuid_le *type_gui
continue;
}
+ if (cpumask_weight(&primary->alloced_cpus_in_node) ==
+ cpumask_weight(cpumask_of_node(primary->numa_node))) {
+ /*
+ * We have cycled through all the CPUs in the node;
+ * reset the alloced map.
+ * This is necessary because we never clear
+ * primary->alloced_cpus_in_node in other places.
+ * We need this to "break" the loop when reloading
+ * hv_netvsc in SMP guest.
+ */
+ cpumask_clear(&primary->alloced_cpus_in_node);
+ }
+
if (!cpumask_test_cpu(cur_cpu,
&primary->alloced_cpus_in_node)) {
cpumask_set_cpu(cur_cpu,
--
2.1.0
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