diff options
Diffstat (limited to 'drivers/hv/hv.c')
| -rw-r--r-- | drivers/hv/hv.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 12e7baecb84e..2ea12207caa0 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -82,10 +82,15 @@ int hv_post_message(union hv_connection_id connection_id, aligned_msg->message_type = message_type; aligned_msg->payload_size = payload_size; memcpy((void *)aligned_msg->payload, payload, payload_size); - put_cpu_ptr(hv_cpu); status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL); + /* Preemption must remain disabled until after the hypercall + * so some other thread can't get scheduled onto this cpu and + * corrupt the per-cpu post_msg_page + */ + put_cpu_ptr(hv_cpu); + return status & 0xFFFF; } @@ -96,7 +101,7 @@ static int hv_ce_set_next_event(unsigned long delta, WARN_ON(!clockevent_state_oneshot(evt)); - hv_get_current_tick(current_tick); + current_tick = hyperv_cs->read(NULL); current_tick += delta; hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick); return 0; |