mshyperv: fix recognition of Hyper-V guest crash MSR's

Hypervisor Top Level Functional Specification v3.1/4.0 notes that cpuid
(0x40000003) EDX's 10th bit should be used to check that Hyper-V guest
crash MSR's functionality available.

This patch should fix this recognition. Currently the code checks EAX
register instead of EDX.

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index b6114cc89aeb..e7b0bcd453e7 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -871,7 +871,7 @@ static int vmbus_bus_init(int irq)
         /*
          * Only register if the crash MSRs are available
          */
-        if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
+        if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
                 register_die_notifier(&hyperv_die_block);
                 atomic_notifier_chain_register(&panic_notifier_list,
                                                &hyperv_panic_block);
@@ -1169,7 +1169,7 @@ static void __exit vmbus_exit(void)
         hv_remove_vmbus_irq();
         tasklet_kill(&msg_dpc);
         vmbus_free_channels();
-        if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
+        if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
                 unregister_die_notifier(&hyperv_die_block);
                 atomic_notifier_chain_unregister(&panic_notifier_list,
                                                  &hyperv_panic_block);