diff options
| -rw-r--r-- | drivers/hv/channel_mgmt.c | 3 | ||||
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 19 |
2 files changed, 16 insertions, 6 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index 16eb9b3f1cb1..3bf1f9ef8ea2 100644 --- a/drivers/hv/channel_mgmt.c +++ b/drivers/hv/channel_mgmt.c @@ -849,6 +849,9 @@ void vmbus_initiate_unload(bool crash) { struct vmbus_channel_message_header hdr; + if (xchg(&vmbus_connection.conn_state, DISCONNECTED) == DISCONNECTED) + return; + /* Pre-Win2012R2 hosts don't support reconnect */ if (vmbus_proto_version < VERSION_WIN8_1) return; diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 9aa18f387a34..5ff7c1708d0e 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -63,9 +63,12 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, { struct pt_regs *regs; - regs = current_pt_regs(); + vmbus_initiate_unload(true); - hyperv_report_panic(regs, val); + if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { + regs = current_pt_regs(); + hyperv_report_panic(regs, val); + } return NOTIFY_DONE; } @@ -1228,10 +1231,16 @@ static int vmbus_bus_init(void) } register_die_notifier(&hyperv_die_block); - atomic_notifier_chain_register(&panic_notifier_list, - &hyperv_panic_block); } + /* + * Always register the panic notifier because we need to unload + * the VMbus channel connection to prevent any VMbus + * activity after the VM panics. + */ + atomic_notifier_chain_register(&panic_notifier_list, + &hyperv_panic_block); + vmbus_request_offers(); return 0; @@ -1875,7 +1884,6 @@ static void hv_kexec_handler(void) { hv_synic_clockevents_cleanup(); vmbus_initiate_unload(false); - vmbus_connection.conn_state = DISCONNECTED; /* Make sure conn_state is set as hv_synic_cleanup checks for it */ mb(); cpuhp_remove_state(hyperv_cpuhp_online); @@ -1890,7 +1898,6 @@ static void hv_crash_handler(struct pt_regs *regs) * doing the cleanup for current CPU only. This should be sufficient * for kdump. */ - vmbus_connection.conn_state = DISCONNECTED; hv_synic_cleanup(smp_processor_id()); hyperv_cleanup(); }; |