drivers:hv: Export the API to invoke a hypercall on Hyper-V
This patch exposes the function that hv_vmbus.ko uses to make hypercalls. This
is necessary for retargeting an interrupt when it is given a new affinity.
Since we are exporting this API, rename the API as it will be visible outside
the hv.c file.
Signed-off-by: Jake Oshins <jakeo@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index ad7fc6d..eb4e383 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -89,9 +89,9 @@
}
/*
- * do_hypercall- Invoke the specified hypercall
+ * hv_do_hypercall- Invoke the specified hypercall
*/
-static u64 do_hypercall(u64 control, void *input, void *output)
+u64 hv_do_hypercall(u64 control, void *input, void *output)
{
u64 input_address = (input) ? virt_to_phys(input) : 0;
u64 output_address = (output) ? virt_to_phys(output) : 0;
@@ -132,6 +132,7 @@
return hv_status_lo | ((u64)hv_status_hi << 32);
#endif /* !x86_64 */
}
+EXPORT_SYMBOL_GPL(hv_do_hypercall);
#ifdef CONFIG_X86_64
static cycle_t read_hv_clock_tsc(struct clocksource *arg)
@@ -316,7 +317,7 @@
{
struct hv_input_post_message *aligned_msg;
- u16 status;
+ u64 status;
if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
return -EMSGSIZE;
@@ -330,11 +331,10 @@
aligned_msg->payload_size = payload_size;
memcpy((void *)aligned_msg->payload, payload, payload_size);
- status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
- & 0xFFFF;
+ status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
put_cpu();
- return status;
+ return status & 0xFFFF;
}
@@ -344,13 +344,13 @@
*
* This involves a hypercall.
*/
-u16 hv_signal_event(void *con_id)
+int hv_signal_event(void *con_id)
{
- u16 status;
+ u64 status;
- status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
+ status = hv_do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL);
- return status;
+ return status & 0xFFFF;
}
static int hv_ce_set_next_event(unsigned long delta,
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 12156db..9beeb14 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -587,7 +587,7 @@
enum hv_message_type message_type,
void *payload, size_t payload_size);
-extern u16 hv_signal_event(void *con_id);
+extern int hv_signal_event(void *con_id);
extern int hv_synic_alloc(void);
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index fddb3e0..24d0b65 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -984,6 +984,7 @@
bool fb_overlap_ok);
int vmbus_cpu_number_to_vp_number(int cpu_number);
+u64 hv_do_hypercall(u64 control, void *input, void *output);
/**
* VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device