[Xen-devel] [PATCH] pt_msix_init: Error: Can't map physical MSI-X table: Invalid argument

[Bruce Edge <bruce.edge@xxxxxxxxx>]

Force msi-x init mmap to a page boundary or mmap fails with.
    pt_msix_init: Error: Can't map physical MSI-X table: Invalid argument

Signed-off-by: Bruce Edge <Bruce.edge@xxxxxxx>

--- ./tools/ioemu-remote/hw/pass-through.h.orig 2009-10-15
10:22:17.000000000 -0700
+++ ./tools/ioemu-remote/hw/pass-through.h      2009-10-15
11:08:58.000000000 -0700
@@ -193,6 +193,7 @@
    int mmio_index;
    void *phys_iomem_base;
    struct msix_entry_info msix_entry[0];
+       uint32_t table_offset_adjust;   /* page align mmap */
 };

 struct pt_pm_info {


--- ./tools/ioemu-remote/hw/pt-msi.c.orig       2009-10-13
11:54:11.000000000 -0700
+++ ./tools/ioemu-remote/hw/pt-msi.c    2009-10-15 10:29:50.000000000 -0700
@@ -542,6 +542,7 @@
    int i, total_entries, table_off, bar_index;
    struct pci_dev *pd = dev->pci_dev;
    int fd;
+    int err;

    id = pci_read_byte(pd, pos + PCI_CAP_LIST_ID);

@@ -584,9 +585,15 @@
        PT_LOG("Error: Can't open /dev/mem: %s\n", strerror(errno));
        goto error_out;
    }
-    dev->msix->phys_iomem_base = mmap(0, total_entries * 16,
+    PT_LOG("table_off = %llx, total_entries = %d\n",table_off,total_entries);
+    dev->msix->table_offset_adjust = table_off & 0x0fff;
+    dev->msix->phys_iomem_base = mmap(0, total_entries * 16 +
dev->msix->table_offset_adjust,
                          PROT_WRITE | PROT_READ, MAP_SHARED | MAP_LOCKED,
-                          fd, dev->msix->table_base + table_off);
+                          fd, dev->msix->table_base + table_off -
dev->msix->table_offset_adjust);
+    dev->msix->phys_iomem_base = (void *)((char *)dev->msix->phys_iomem_base +
+                          dev->msix->table_offset_adjust);
+    err = errno;
+    PT_LOG("errno = %d\n",err);
    if ( dev->msix->phys_iomem_base == MAP_FAILED )
    {
        PT_LOG("Error: Can't map physical MSI-X table: %s\n", strerror(errno));
@@ -612,7 +619,8 @@
    {
        PT_LOG("unmapping physical MSI-X table from %lx\n",
           (unsigned long)dev->msix->phys_iomem_base);
-        munmap(dev->msix->phys_iomem_base, dev->msix->total_entries * 16);
+        munmap(dev->msix->phys_iomem_base, dev->msix->total_entries * 16 +
+           dev->msix->table_offset_adjust);
    }

    free(dev->msix);

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