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Groups > linux.kernel > #1198258

[PATCH 1/4] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num

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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 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>
---
 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 2064f31..5b1a019 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1153,6 +1153,23 @@ 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 54733d5..02393b6 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -982,6 +982,8 @@ 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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[PATCH 0/4] New Paravirtual front-end for PCI in a Hyper-V VM jakeo@microsoft.com - 2015-08-02 03:10 +0200
  [PATCH 3/4] drivers:x86:pci: Make it possible to implement a PCI MSI IRQ Domain in a module. jakeo@microsoft.com - 2015-08-02 03:10 +0200
  [PATCH 2/4] drivers:hv: Define the channel type for Hyper-V PCI Express pass-through jakeo@microsoft.com - 2015-08-02 03:10 +0200
  [PATCH 1/4] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num jakeo@microsoft.com - 2015-08-02 03:10 +0200
  [PATCH 4/4] drivers:pci:hv: New paravirtual PCI front-end for Hyper-V VMs jakeo@microsoft.com - 2015-08-02 03:10 +0200
    Re: [PATCH 4/4] drivers:pci:hv: New paravirtual PCI front-end for  Hyper-V VMs Thomas Gleixner <tglx@linutronix.de> - 2015-08-02 10:50 +0200
      RE: [PATCH 4/4] drivers:pci:hv: New paravirtual PCI front-end for  Hyper-V VMs Jake Oshins <jakeo@microsoft.com> - 2015-08-03 21:30 +0200
        RE: [PATCH 4/4] drivers:pci:hv: New paravirtual PCI front-end for  Hyper-V VMs Thomas Gleixner <tglx@linutronix.de> - 2015-08-03 21:50 +0200
    Re: [PATCH 4/4] drivers:pci:hv: New paravirtual PCI front-end for  Hyper-V VMs Paul Bolle <pebolle@tiscali.nl> - 2015-08-03 11:20 +0200
      Re: [PATCH 4/4] drivers:pci:hv: New paravirtual PCI front-end for  Hyper-V VMs Dan Carpenter <dan.carpenter@oracle.com> - 2015-08-03 12:00 +0200

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