[RFC][PATCH 09/45] msi: Factor out msi_message_from_vector

[Jan Kiszka <jan.kiszka@xxxxxxxxxxx>]

This helper will also be used by the upcoming config notifier.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
 hw/msi.c |   43 +++++++++++++++++++++++++------------------
 1 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/hw/msi.c b/hw/msi.c
index 2b7b6e3..3c7ebc3 100644
--- a/hw/msi.c
+++ b/hw/msi.c
@@ -113,6 +113,25 @@ bool msi_enabled(const PCIDevice *dev)
          PCI_MSI_FLAGS_ENABLE);
 }
 
+static void msi_message_from_vector(PCIDevice *dev, uint16_t msi_flags,
+                                    unsigned vector, MSIMessage *msg)
+{
+    bool msi64bit = msi_flags & PCI_MSI_FLAGS_64BIT;
+    unsigned int nr_vectors = msi_nr_vectors(msi_flags);
+
+    msg->address = pci_get_long(dev->config + msi_address_lo_off(dev));
+    if (msi64bit) {
+        msg->address |= (uint64_t)pci_get_long(dev->config +
+                                               msi_address_hi_off(dev)) << 32;
+    }
+
+    msg->data = pci_get_word(dev->config + msi_data_off(dev, msi64bit));
+    if (nr_vectors > 1) {
+        msg->data &= ~(nr_vectors - 1);
+        msg->data |= vector;
+    }
+}
+
 static void kvm_msi_message_from_vector(PCIDevice *dev, unsigned vector,
                                         KVMMsiMessage *kmm)
 {
@@ -339,11 +358,10 @@ void msi_notify(PCIDevice *dev, unsigned int vector)
 {
     uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
     bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
-    unsigned int nr_vectors = msi_nr_vectors(flags);
-    uint64_t address;
-    uint32_t data;
+    MSIMessage msg;
+
+    assert(vector < msi_nr_vectors(flags));
 
-    assert(vector < nr_vectors);
     if (msi_is_masked(dev, vector)) {
         assert(flags & PCI_MSI_FLAGS_MASKBIT);
         pci_long_test_and_set_mask(
@@ -357,24 +375,13 @@ void msi_notify(PCIDevice *dev, unsigned int vector)
         return;
     }
 
-    if (msi64bit) {
-        address = pci_get_quad(dev->config + msi_address_lo_off(dev));
-    } else {
-        address = pci_get_long(dev->config + msi_address_lo_off(dev));
-    }
-
-    /* upper bit 31:16 is zero */
-    data = pci_get_word(dev->config + msi_data_off(dev, msi64bit));
-    if (nr_vectors > 1) {
-        data &= ~(nr_vectors - 1);
-        data |= vector;
-    }
+    msi_message_from_vector(dev, flags, vector, &msg);
 
     MSI_DEV_PRINTF(dev,
                    "notify vector 0x%x"
                    " address: 0x%"PRIx64" data: 0x%"PRIx32"\n",
-                   vector, address, data);
-    stl_le_phys(address, data);
+                   vector, msg.address, msg.data);
+    stl_le_phys(msg.address, msg.data);
 }
 
 /* Normally called by pci_default_write_config(). */
-- 
1.7.3.4

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