pci: removed the is_express field since a uniform interface was inserted

according to Eduardo Habkost's commit fd3b02c889 all PCIEs now implement
INTERFACE_PCIE_DEVICE so we don't need is_express field anymore.

Devices that implements only INTERFACE_PCIE_DEVICE (is_express == 1)
or
devices that implements only INTERFACE_CONVENTIONAL_PCI_DEVICE (is_express == 0)
where not affected by the change.

The only devices that were affected are those that are hybrid and also
had (is_express == 1) - therefor only:
  - hw/vfio/pci.c
  - hw/usb/hcd-xhci.c
  - hw/xen/xen_pt.c

For those 3 I made sure that QEMU_PCI_CAP_EXPRESS is on in instance_init()

Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Yoni Bettan <ybettan@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

docs/pcie_pci_bridge.txt

@@ -110,5 +110,5 @@ To enable device hot-plug into the bridge on Linux there're 3 ways:
 Implementation
 ==============
 The PCIE-PCI bridge is based on PCI-PCI bridge, but also accumulates PCI Express
-features as a PCI Express device (is_express=1).
+features as a PCI Express device.
 

hw/block/nvme.c

@@ -1360,7 +1360,6 @@ static void nvme_class_init(ObjectClass *oc, void *data)
     pc->vendor_id = PCI_VENDOR_ID_INTEL;
     pc->device_id = 0x5845;
     pc->revision = 2;
-    pc->is_express = 1;
 
     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
     dc->desc = "Non-Volatile Memory Express";

hw/net/e1000e.c

@@ -675,7 +675,6 @@ static void e1000e_class_init(ObjectClass *class, void *data)
     c->revision = 0;
     c->romfile = "efi-e1000e.rom";
     c->class_id = PCI_CLASS_NETWORK_ETHERNET;
-    c->is_express = 1;
 
     dc->desc = "Intel 82574L GbE Controller";
     dc->reset = e1000e_qdev_reset;

hw/pci-bridge/pcie_pci_bridge.c

@@ -170,7 +170,6 @@ static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
 
-    k->is_express = 1;
     k->is_bridge = 1;
     k->vendor_id = PCI_VENDOR_ID_REDHAT;
     k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE;

hw/pci-bridge/pcie_root_port.c

@@ -145,7 +145,6 @@ static void rp_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->is_express = 1;
     k->is_bridge = 1;
     k->config_write = rp_write_config;
     k->realize = rp_realize;

hw/pci-bridge/xio3130_downstream.c

@@ -178,7 +178,6 @@ static void xio3130_downstream_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->is_express = 1;
     k->is_bridge = 1;
     k->config_write = xio3130_downstream_write_config;
     k->realize = xio3130_downstream_realize;

hw/pci-bridge/xio3130_upstream.c

@@ -149,7 +149,6 @@ static void xio3130_upstream_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
-    k->is_express = 1;
     k->is_bridge = 1;
     k->config_write = xio3130_upstream_write_config;
     k->realize = xio3130_upstream_realize;

hw/pci-host/xilinx-pcie.c

@@ -297,7 +297,6 @@ static void xilinx_pcie_root_class_init(ObjectClass *klass, void *data)
     k->device_id = 0x7021;
     k->revision = 0;
     k->class_id = PCI_CLASS_BRIDGE_HOST;
-    k->is_express = true;
     k->is_bridge = true;
     k->realize = xilinx_pcie_root_realize;
     k->exit = pci_bridge_exitfn;

hw/pci/pci.c

@@ -2005,11 +2005,15 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
 {
     PCIDevice *pci_dev = (PCIDevice *)qdev;
     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pci_dev);
+    ObjectClass *klass = OBJECT_CLASS(pc);
     Error *local_err = NULL;
     bool is_default_rom;
 
-    /* initialize cap_present for pci_is_express() and pci_config_size() */
-    if (pc->is_express) {
+    /* initialize cap_present for pci_is_express() and pci_config_size(),
+     * Note that hybrid PCIs are not set automatically and need to manage
+     * QEMU_PCI_CAP_EXPRESS manually */
+    if (object_class_dynamic_cast(klass, INTERFACE_PCIE_DEVICE) &&
+       !object_class_dynamic_cast(klass, INTERFACE_CONVENTIONAL_PCI_DEVICE)) {
         pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
     }
 

hw/scsi/megasas.c

@@ -2447,7 +2447,6 @@ typedef struct MegasasInfo {
     uint16_t subsystem_id;
     int ioport_bar;
     int mmio_bar;
-    bool is_express;
     int osts;
     const VMStateDescription *vmsd;
     Property *props;
@@ -2465,7 +2464,6 @@ static struct MegasasInfo megasas_devices[] = {
         .ioport_bar = 2,
         .mmio_bar = 0,
         .osts = MFI_1078_RM | 1,
-        .is_express = false,
         .vmsd = &vmstate_megasas_gen1,
         .props = megasas_properties_gen1,
         .interfaces = (InterfaceInfo[]) {
@@ -2482,7 +2480,6 @@ static struct MegasasInfo megasas_devices[] = {
         .ioport_bar = 0,
         .mmio_bar = 1,
         .osts = MFI_GEN2_RM,
-        .is_express = true,
         .vmsd = &vmstate_megasas_gen2,
         .props = megasas_properties_gen2,
         .interfaces = (InterfaceInfo[]) {
@@ -2506,7 +2503,6 @@ static void megasas_class_init(ObjectClass *oc, void *data)
     pc->subsystem_vendor_id = PCI_VENDOR_ID_LSI_LOGIC;
     pc->subsystem_id = info->subsystem_id;
     pc->class_id = PCI_CLASS_STORAGE_RAID;
-    pc->is_express = info->is_express;
     e->mmio_bar = info->mmio_bar;
     e->ioport_bar = info->ioport_bar;
     e->osts = info->osts;

hw/usb/hcd-xhci.c

@@ -3649,6 +3649,13 @@ static Property xhci_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static void xhci_instance_init(Object *obj)
+{
+    /* QEMU_PCI_CAP_EXPRESS initialization does not depend on QEMU command
+     * line, therefore, no need to wait to realize like other devices */
+    PCI_DEVICE(obj)->cap_present |= QEMU_PCI_CAP_EXPRESS;
+}
+
 static void xhci_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
@@ -3661,7 +3668,6 @@ static void xhci_class_init(ObjectClass *klass, void *data)
     k->realize      = usb_xhci_realize;
     k->exit         = usb_xhci_exit;
     k->class_id     = PCI_CLASS_SERIAL_USB;
-    k->is_express   = 1;
 }
 
 static const TypeInfo xhci_info = {
@@ -3669,6 +3675,7 @@ static const TypeInfo xhci_info = {
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(XHCIState),
     .class_init    = xhci_class_init,
+    .instance_init = xhci_instance_init,
     .abstract      = true,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_PCIE_DEVICE },

hw/vfio/pci.c

@@ -3113,6 +3113,10 @@ static void vfio_instance_init(Object *obj)
     vdev->host.function = ~0U;
 
     vdev->nv_gpudirect_clique = 0xFF;
+
+    /* QEMU_PCI_CAP_EXPRESS initialization does not depend on QEMU command
+     * line, therefore, no need to wait to realize like other devices */
+    pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
 }
 
 static Property vfio_pci_dev_properties[] = {
@@ -3171,7 +3175,6 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
     pdc->exit = vfio_exitfn;
     pdc->config_read = vfio_pci_read_config;
     pdc->config_write = vfio_pci_write_config;
-    pdc->is_express = 1; /* We might be */
 }
 
 static const TypeInfo vfio_pci_dev_info = {

hw/xen/xen_pt.c

@@ -937,6 +937,13 @@ static Property xen_pci_passthrough_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static void xen_pci_passthrough_instance_init(Object *obj)
+{
+    /* QEMU_PCI_CAP_EXPRESS initialization does not depend on QEMU command
+     * line, therefore, no need to wait to realize like other devices */
+    PCI_DEVICE(obj)->cap_present |= QEMU_PCI_CAP_EXPRESS;
+}
+
 static void xen_pci_passthrough_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -946,7 +953,6 @@ static void xen_pci_passthrough_class_init(ObjectClass *klass, void *data)
     k->exit = xen_pt_unregister_device;
     k->config_read = xen_pt_pci_read_config;
     k->config_write = xen_pt_pci_write_config;
-    k->is_express = 1; /* We might be */
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     dc->desc = "Assign an host PCI device with Xen";
     dc->props = xen_pci_passthrough_properties;
@@ -965,6 +971,7 @@ static const TypeInfo xen_pci_passthrough_info = {
     .instance_size = sizeof(XenPCIPassthroughState),
     .instance_finalize = xen_pci_passthrough_finalize,
     .class_init = xen_pci_passthrough_class_init,
+    .instance_init = xen_pci_passthrough_instance_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
         { INTERFACE_PCIE_DEVICE },

include/hw/pci/pci.h

@@ -236,9 +236,6 @@ typedef struct PCIDeviceClass {
      */
     int is_bridge;
 
-    /* pcie stuff */
-    int is_express;   /* is this device pci express? */
-
     /* rom bar */
     const char *romfile;
 } PCIDeviceClass;