hw/pci-host/q35: Initialize PCI_HOST_BYPASS_IOMMU property from board…

… code

The Q35 PCI host already has a PCI_HOST_BYPASS_IOMMU property. However, the
host initializes this property itself by accessing global machine state,
thereby assuming it to be a PC machine. Avoid this by having board code
set this property.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230630073720.21297-6-shentey@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/i386/pc_q35.c

@@ -230,6 +230,8 @@ static void pc_q35_init(MachineState *machine)
                             x86ms->below_4g_mem_size, NULL);
     object_property_set_int(phb, PCI_HOST_ABOVE_4G_MEM_SIZE,
                             x86ms->above_4g_mem_size, NULL);
+    object_property_set_bool(phb, PCI_HOST_BYPASS_IOMMU,
+                             pcms->default_bus_bypass_iommu, NULL);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(phb), &error_fatal);
 
     /* pci */

hw/pci-host/q35.c

@@ -66,8 +66,7 @@ static void q35_host_realize(DeviceState *dev, Error **errp)
                                 s->mch.pci_address_space,
                                 s->mch.address_space_io,
                                 0, TYPE_PCIE_BUS);
-    pci->bypass_iommu =
-        PC_MACHINE(qdev_get_machine())->default_bus_bypass_iommu;
+
     qdev_realize(DEVICE(&s->mch), BUS(pci->bus), &error_fatal);
 }