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authorJake Oshins <jakeo@microsoft.com>2015-12-15 03:01:39 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-12-15 06:12:21 +0300
commit619848bd074343ff2bdeeafca0be39748f6da372 (patch)
tree1859ac19a893f8db5910b3219a4ffe66e8f5de40 /drivers/hv
parent17efbee8ba02ef00d3b270998978f8a1a90f1d92 (diff)
downloadlinux-619848bd074343ff2bdeeafca0be39748f6da372.tar.xz
drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num
This patch exposes the mapping between Linux CPU number and Hyper-V virtual processor number. This is necessary because the hypervisor needs to know which virtual processors to target when making a mapping in the Interrupt Redirection Table in the I/O MMU. 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>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 3297731017e4..c01b689e39b1 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1193,6 +1193,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
}
EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
+/**
+ * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
+ * @cpu_number: CPU number in Linux terms
+ *
+ * This function returns the mapping between the Linux processor
+ * number and the hypervisor's virtual processor number, useful
+ * in making hypercalls and such that talk about specific
+ * processors.
+ *
+ * Return: Virtual processor number in Hyper-V terms
+ */
+int vmbus_cpu_number_to_vp_number(int cpu_number)
+{
+ return hv_context.vp_index[cpu_number];
+}
+EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
+
static int vmbus_acpi_add(struct acpi_device *device)
{
acpi_status result;