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    Subject[PATCH v7 1/7] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num
    Date
    From: Jake Oshins <jakeo@microsoft.com>

    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 processor to target when making a mapping in the
    Interrupt Redirection Table in the I/O MMU.

    Signed-off-by: Jake Oshins <jakeo@microsoft.com>
    ---
    drivers/hv/vmbus_drv.c | 17 +++++++++++++++++
    include/linux/hyperv.h | 2 ++
    2 files changed, 19 insertions(+)

    diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
    index f19b6f7..c89d0e5 100644
    --- a/drivers/hv/vmbus_drv.c
    +++ b/drivers/hv/vmbus_drv.c
    @@ -1191,6 +1191,23 @@ 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;
    diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
    index 8fdc17b..fddb3e0 100644
    --- a/include/linux/hyperv.h
    +++ b/include/linux/hyperv.h
    @@ -983,6 +983,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
    resource_size_t size, resource_size_t align,
    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
    *
    --
    1.9.1


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