Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 309 insertions, 0 deletions

diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
new file mode 100644
index 000000000..6c31398dd
--- /dev/null
+++ b/hw/isa/isa-bus.c
@@ -0,0 +1,309 @@
+/*
+ * isa bus support for qdev.
+ *
+ * Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qemu/module.h"
+#include "qapi/error.h"
+#include "monitor/monitor.h"
+#include "hw/sysbus.h"
+#include "sysemu/sysemu.h"
+#include "hw/isa/isa.h"
+
+static ISABus *isabus;
+
+static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
+static char *isabus_get_fw_dev_path(DeviceState *dev);
+
+static void isa_bus_class_init(ObjectClass *klass, void *data)
+{
+    BusClass *k = BUS_CLASS(klass);
+
+    k->print_dev = isabus_dev_print;
+    k->get_fw_dev_path = isabus_get_fw_dev_path;
+}
+
+static const TypeInfo isa_dma_info = {
+    .name = TYPE_ISADMA,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(IsaDmaClass),
+};
+
+static const TypeInfo isa_bus_info = {
+    .name = TYPE_ISA_BUS,
+    .parent = TYPE_BUS,
+    .instance_size = sizeof(ISABus),
+    .class_init = isa_bus_class_init,
+};
+
+ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
+                    MemoryRegion *address_space_io, Error **errp)
+{
+    if (isabus) {
+        error_setg(errp, "Can't create a second ISA bus");
+        return NULL;
+    }
+    if (!dev) {
+        dev = qdev_new("isabus-bridge");
+        sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+    }
+
+    isabus = ISA_BUS(qbus_new(TYPE_ISA_BUS, dev, NULL));
+    isabus->address_space = address_space;
+    isabus->address_space_io = address_space_io;
+    return isabus;
+}
+
+void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
+{
+    bus->irqs = irqs;
+}
+
+/*
+ * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
+ *
+ * This function is only for special cases such as the 'ferr', and
+ * temporary use for normal devices until they are converted to qdev.
+ */
+qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
+{
+    assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
+    assert(isairq < ISA_NUM_IRQS);
+    return isabus->irqs[isairq];
+}
+
+void isa_init_irq(ISADevice *dev, qemu_irq *p, unsigned isairq)
+{
+    assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
+    assert(isairq < ISA_NUM_IRQS);
+    dev->isairq[dev->nirqs] = isairq;
+    *p = isa_get_irq(dev, isairq);
+    dev->nirqs++;
+}
+
+void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
+{
+    qemu_irq irq;
+    isa_init_irq(isadev, &irq, isairq);
+    qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
+}
+
+void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
+{
+    assert(bus && dma8 && dma16);
+    assert(!bus->dma[0] && !bus->dma[1]);
+    bus->dma[0] = dma8;
+    bus->dma[1] = dma16;
+}
+
+IsaDma *isa_get_dma(ISABus *bus, int nchan)
+{
+    assert(bus);
+    return bus->dma[nchan > 3 ? 1 : 0];
+}
+
+static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
+{
+    if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
+        dev->ioport_id = ioport;
+    }
+}
+
+void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
+{
+    memory_region_add_subregion(isabus->address_space_io, start, io);
+    isa_init_ioport(dev, start);
+}
+
+int isa_register_portio_list(ISADevice *dev,
+                             PortioList *piolist, uint16_t start,
+                             const MemoryRegionPortio *pio_start,
+                             void *opaque, const char *name)
+{
+    assert(piolist && !piolist->owner);
+
+    if (!isabus) {
+        return -ENODEV;
+    }
+
+    /* START is how we should treat DEV, regardless of the actual
+       contents of the portio array.  This is how the old code
+       actually handled e.g. the FDC device.  */
+    isa_init_ioport(dev, start);
+
+    portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
+    portio_list_add(piolist, isabus->address_space_io, start);
+
+    return 0;
+}
+
+static void isa_device_init(Object *obj)
+{
+    ISADevice *dev = ISA_DEVICE(obj);
+
+    dev->isairq[0] = -1;
+    dev->isairq[1] = -1;
+}
+
+ISADevice *isa_new(const char *name)
+{
+    return ISA_DEVICE(qdev_new(name));
+}
+
+ISADevice *isa_try_new(const char *name)
+{
+    return ISA_DEVICE(qdev_try_new(name));
+}
+
+ISADevice *isa_create_simple(ISABus *bus, const char *name)
+{
+    ISADevice *dev;
+
+    dev = isa_new(name);
+    isa_realize_and_unref(dev, bus, &error_fatal);
+    return dev;
+}
+
+bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
+{
+    return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
+}
+
+ISADevice *isa_vga_init(ISABus *bus)
+{
+    switch (vga_interface_type) {
+    case VGA_CIRRUS:
+        return isa_create_simple(bus, "isa-cirrus-vga");
+    case VGA_QXL:
+        error_report("%s: qxl: no PCI bus", __func__);
+        return NULL;
+    case VGA_STD:
+        return isa_create_simple(bus, "isa-vga");
+    case VGA_VMWARE:
+        error_report("%s: vmware_vga: no PCI bus", __func__);
+        return NULL;
+    case VGA_VIRTIO:
+        error_report("%s: virtio-vga: no PCI bus", __func__);
+        return NULL;
+    case VGA_NONE:
+    default:
+        return NULL;
+    }
+}
+
+void isa_build_aml(ISABus *bus, Aml *scope)
+{
+    BusChild *kid;
+    ISADevice *dev;
+    ISADeviceClass *dc;
+
+    QTAILQ_FOREACH(kid, &bus->parent_obj.children, sibling) {
+        dev = ISA_DEVICE(kid->child);
+        dc = ISA_DEVICE_GET_CLASS(dev);
+        if (dc->build_aml) {
+            dc->build_aml(dev, scope);
+        }
+    }
+}
+
+static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
+{
+    ISADevice *d = ISA_DEVICE(dev);
+
+    if (d->isairq[1] != -1) {
+        monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
+                       d->isairq[0], d->isairq[1]);
+    } else if (d->isairq[0] != -1) {
+        monitor_printf(mon, "%*sisa irq %d\n", indent, "",
+                       d->isairq[0]);
+    }
+}
+
+static void isabus_bridge_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+    dc->fw_name = "isa";
+}
+
+static const TypeInfo isabus_bridge_info = {
+    .name          = "isabus-bridge",
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(SysBusDevice),
+    .class_init    = isabus_bridge_class_init,
+};
+
+static void isa_device_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *k = DEVICE_CLASS(klass);
+    k->bus_type = TYPE_ISA_BUS;
+}
+
+static const TypeInfo isa_device_type_info = {
+    .name = TYPE_ISA_DEVICE,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(ISADevice),
+    .instance_init = isa_device_init,
+    .abstract = true,
+    .class_size = sizeof(ISADeviceClass),
+    .class_init = isa_device_class_init,
+};
+
+static void isabus_register_types(void)
+{
+    type_register_static(&isa_dma_info);
+    type_register_static(&isa_bus_info);
+    type_register_static(&isabus_bridge_info);
+    type_register_static(&isa_device_type_info);
+}
+
+static char *isabus_get_fw_dev_path(DeviceState *dev)
+{
+    ISADevice *d = ISA_DEVICE(dev);
+    char path[40];
+    int off;
+
+    off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
+    if (d->ioport_id) {
+        snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
+    }
+
+    return g_strdup(path);
+}
+
+MemoryRegion *isa_address_space(ISADevice *dev)
+{
+    if (dev) {
+        return isa_bus_from_device(dev)->address_space;
+    }
+
+    return isabus->address_space;
+}
+
+MemoryRegion *isa_address_space_io(ISADevice *dev)
+{
+    if (dev) {
+        return isa_bus_from_device(dev)->address_space_io;
+    }
+
+    return isabus->address_space_io;
+}
+
+type_init(isabus_register_types)