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Commit 619848bd authored by Jake Oshins's avatar Jake Oshins Committed by Greg Kroah-Hartman
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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: default avatarJake Oshins <jakeo@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 17efbee8

drivers/hv/vmbus_drv.c

+17 −0
Original line number Original line Diff line number Diff line
@@ -1193,6 +1193,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, 
}

}

EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);

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)

static int vmbus_acpi_add(struct acpi_device *device)

{

{

	acpi_status result;

	acpi_status result;

include/linux/hyperv.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -983,6 +983,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, 
			resource_size_t size, resource_size_t align,

			resource_size_t size, resource_size_t align,

			bool fb_overlap_ok);

			bool fb_overlap_ok);





int vmbus_cpu_number_to_vp_number(int cpu_number);



/**

/**

 * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device

 * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device

 *

 *