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>
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@ -1193,6 +1193,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
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}
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EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
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/**
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* vmbus_cpu_number_to_vp_number() - Map CPU to VP.
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* @cpu_number: CPU number in Linux terms
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*
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* This function returns the mapping between the Linux processor
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* number and the hypervisor's virtual processor number, useful
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* in making hypercalls and such that talk about specific
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* processors.
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*
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* Return: Virtual processor number in Hyper-V terms
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*/
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int vmbus_cpu_number_to_vp_number(int cpu_number)
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{
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return hv_context.vp_index[cpu_number];
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}
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EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
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static int vmbus_acpi_add(struct acpi_device *device)
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{
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acpi_status result;
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@ -983,6 +983,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
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resource_size_t size, resource_size_t align,
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bool fb_overlap_ok);
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int vmbus_cpu_number_to_vp_number(int cpu_number);
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/**
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* VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
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*
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