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Message-Id: <1434387999-1885-5-git-send-email-jakeo@microsoft.com>
Date: Mon, 15 Jun 2015 17:06:37 +0000
From: jakeo@...rosoft.com
To: gregkh@...uxfoundation.org, kys@...rosoft.com,
linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
bhelgaas@...gle.com, linux-pci@...r.kernel.org, pebolle@...cali.nl,
haiyangz@...rosoft.com, mebersol@...rosoft.com
Cc: Jake Oshins <jakeo@...rosoft.com>
Subject: [PATCH v2 4/6] drivers:hv: Export a function that maps Linux proc num onto Hyper-V proc num
From: Jake Oshins <jakeo@...rosoft.com>
This patch exports a function which maps Linux processor number onto Hyper-V
virtual processor number. This is necessary in order to map message-
signaled interrupts (MSIs) into a VM, as the hypervisor needs to know the
right target VP.
Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
---
drivers/hv/vmbus_drv.c | 16 ++++++++++++++++
include/linux/hyperv.h | 2 ++
2 files changed, 18 insertions(+)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 067a469..65e4eb6 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1158,6 +1158,22 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
}
EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
+/**
+ * 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.
+ *
+ * @param procnum - in Linux terms
+ *
+ * @return int - in Hyper-V terms
+ */
+int vmbus_procnum_to_vpnum(int procnum)
+{
+ return hv_context.vp_index[procnum];
+}
+EXPORT_SYMBOL_GPL(vmbus_procnum_to_vpnum);
+
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 ffd98d7..6fec42d 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -987,6 +987,8 @@ 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_procnum_to_vpnum(int procnum);
+
/**
* VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
*
--
1.9.1
--
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