raven: disable reentrancy detection for iomem

As the code is designed for re-entrant calls from raven_io_ops to
pci-conf, mark raven_io_ops as reentrancy-safe.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Message-Id: <20230427211013.2994127-8-alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/pci-host/raven.c

@@ -294,6 +294,13 @@ static void raven_pcihost_initfn(Object *obj)
     memory_region_init(&s->pci_memory, obj, "pci-memory", 0x3f000000);
     address_space_init(&s->pci_io_as, &s->pci_io, "raven-io");
 
+    /*
+     * Raven's raven_io_ops use the address-space API to access pci-conf-idx
+     * (which is also owned by the raven device). As such, mark the
+     * pci_io_non_contiguous as re-entrancy safe.
+     */
+    s->pci_io_non_contiguous.disable_reentrancy_guard = true;
+
     /* CPU address space */
     memory_region_add_subregion(address_space_mem, PCI_IO_BASE_ADDR,
                                 &s->pci_io);