[PATCH v2 6/8] pci-assign: Allocate entries for all MSI-X vectors

[Alex Williamson <alex.williamson@redhat.com>]

We still only initialize the number used in the host.  This lets
us do direct access based on MSI-X table offset on write without
needing to translate between physical vector space and initalized
vector space.  It's expected that guests will typically use the
majority of the available vectors, so we're likely not allocating
significantly more entires than are used.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 hw/device-assignment.c |   44 ++++++++++++++++++++++----------------------
 1 files changed, 22 insertions(+), 22 deletions(-)

diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index a33e5b9..fe10a23 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -627,8 +627,11 @@ static void free_dev_irq_entries(AssignedDevice *dev)
 {
     int i;
 
-    for (i = 0; i < dev->irq_entries_nr; i++)
-        kvm_del_routing_entry(&dev->entry[i]);
+    for (i = 0; i < dev->irq_entries_nr; i++) {
+        if (dev->entry[i].type) {
+            kvm_del_routing_entry(&dev->entry[i]);
+        }
+    }
     g_free(dev->entry);
     dev->entry = NULL;
     dev->irq_entries_nr = 0;
@@ -976,7 +979,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
         if (entry->data == 0) {
             continue;
         }
-        entries_nr ++;
+        entries_nr++;
     }
 
     if (entries_nr == 0) {
@@ -993,15 +996,13 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
     }
 
     free_dev_irq_entries(adev);
-    adev->irq_entries_nr = entries_nr;
-    adev->entry = g_malloc0(entries_nr * sizeof(*(adev->entry)));
+
+    adev->irq_entries_nr = adev->msix_max;
+    adev->entry = g_malloc0(adev->msix_max * sizeof(*(adev->entry)));
 
     msix_entry.assigned_dev_id = msix_nr.assigned_dev_id;
-    entries_nr = 0;
     entry = adev->msix_table;
     for (i = 0; i < adev->msix_max; i++, entry++) {
-        if (entries_nr >= msix_nr.entry_nr)
-            break;
         if (entry->data == 0) {
             continue;
         }
@@ -1010,26 +1011,25 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
         if (r < 0)
             return r;
 
-        adev->entry[entries_nr].gsi = r;
-        adev->entry[entries_nr].type = KVM_IRQ_ROUTING_MSI;
-        adev->entry[entries_nr].flags = 0;
-        adev->entry[entries_nr].u.msi.address_lo = entry->addr_lo;
-        adev->entry[entries_nr].u.msi.address_hi = entry->addr_hi;
-        adev->entry[entries_nr].u.msi.data = entry->data;
-        DEBUG("MSI-X data 0x%x, MSI-X addr_lo 0x%x\n!",
-              entry->data, entry->addr_lo);
-	kvm_add_routing_entry(&adev->entry[entries_nr]);
-
-        msix_entry.gsi = adev->entry[entries_nr].gsi;
+        adev->entry[i].gsi = r;
+        adev->entry[i].type = KVM_IRQ_ROUTING_MSI;
+        adev->entry[i].flags = 0;
+        adev->entry[i].u.msi.address_lo = entry->addr_lo;
+        adev->entry[i].u.msi.address_hi = entry->addr_hi;
+        adev->entry[i].u.msi.data = entry->data;
+
+        DEBUG("MSI-X vector %d, gsi %d, addr %08x_%08x, data %08x\n", i,
+              r, entry->addr_hi, entry->addr_lo, entry->data);
+
+        kvm_add_routing_entry(&adev->entry[i]);
+
+        msix_entry.gsi = adev->entry[i].gsi;
         msix_entry.entry = i;
         r = kvm_assign_set_msix_entry(kvm_state, &msix_entry);
         if (r) {
             fprintf(stderr, "fail to set MSI-X entry! %s\n", strerror(-r));
             break;
         }
-        DEBUG("MSI-X entry gsi 0x%x, entry %d\n!",
-                msix_entry.gsi, msix_entry.entry);
-        entries_nr ++;
     }
 
     if (r == 0 && kvm_commit_irq_routes() < 0) {