vfio: cpu: Use "real" page size API

This is system level code, and should only depend on the host page
size, not the target page size.

Note that HOST_PAGE_SIZE is misleadingly lead and is really aligning
to both host and target page size. Hence it's replacement with
REAL_HOST_PAGE_SIZE.
Signed-off-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Tested-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

hw/vfio/pci.c

@@ -2388,7 +2388,7 @@ static void vfio_map_bar(VFIOPCIDevice *vdev, int nr)
      * potentially insert a direct-mapped subregion before and after it.
      */
     if (vdev->msix && vdev->msix->table_bar == nr) {
-        size = vdev->msix->table_offset & qemu_host_page_mask;
+        size = vdev->msix->table_offset & qemu_real_host_page_mask;
     }
 
     strncat(name, " mmap", sizeof(name) - strlen(name) - 1);
@@ -2401,8 +2401,9 @@ static void vfio_map_bar(VFIOPCIDevice *vdev, int nr)
     if (vdev->msix && vdev->msix->table_bar == nr) {
         uint64_t start;
 
-        start = HOST_PAGE_ALIGN((uint64_t)vdev->msix->table_offset +
-                                (vdev->msix->entries * PCI_MSIX_ENTRY_SIZE));
+        start = REAL_HOST_PAGE_ALIGN((uint64_t)vdev->msix->table_offset +
+                                     (vdev->msix->entries *
+                                      PCI_MSIX_ENTRY_SIZE));
 
         size = start < bar->region.size ? bar->region.size - start : 0;
         strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1);