diff options
| author | Jake Oshins <jakeo@microsoft.com> | 2015-12-14 16:01:39 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-12-14 19:12:21 -0800 |
| commit | 619848bd074343ff2bdeeafca0be39748f6da372 (patch) | |
| tree | 1859ac19a893f8db5910b3219a4ffe66e8f5de40 /drivers/hv | |
| parent | 17efbee8ba02ef00d3b270998978f8a1a90f1d92 (diff) | |
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.c | 17 |
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; |