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, 165 insertions, 0 deletions

diff --git a/hw/i386/kvm/ioapic.c b/hw/i386/kvm/ioapic.c
new file mode 100644
index 000000000..ee7c8ef68
--- /dev/null
+++ b/hw/i386/kvm/ioapic.c
@@ -0,0 +1,165 @@
+/*
+ * KVM in-kernel IOPIC support
+ *
+ * Copyright (c) 2011 Siemens AG
+ *
+ * Authors:
+ *  Jan Kiszka          <jan.kiszka@siemens.com>
+ *
+ * This work is licensed under the terms of the GNU GPL version 2.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "monitor/monitor.h"
+#include "hw/i386/x86.h"
+#include "hw/qdev-properties.h"
+#include "hw/i386/ioapic_internal.h"
+#include "hw/i386/apic_internal.h"
+#include "sysemu/kvm.h"
+
+/* PC Utility function */
+void kvm_pc_setup_irq_routing(bool pci_enabled)
+{
+    KVMState *s = kvm_state;
+    int i;
+
+    assert(kvm_has_gsi_routing());
+    for (i = 0; i < 8; ++i) {
+        if (i == 2) {
+            continue;
+        }
+        kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_PIC_MASTER, i);
+    }
+    for (i = 8; i < 16; ++i) {
+        kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_PIC_SLAVE, i - 8);
+    }
+    if (pci_enabled) {
+        for (i = 0; i < 24; ++i) {
+            if (i == 0) {
+                kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_IOAPIC, 2);
+            } else if (i != 2) {
+                kvm_irqchip_add_irq_route(s, i, KVM_IRQCHIP_IOAPIC, i);
+            }
+        }
+    }
+    kvm_irqchip_commit_routes(s);
+}
+
+typedef struct KVMIOAPICState KVMIOAPICState;
+
+struct KVMIOAPICState {
+    IOAPICCommonState ioapic;
+    uint32_t kvm_gsi_base;
+};
+
+static void kvm_ioapic_get(IOAPICCommonState *s)
+{
+    struct kvm_irqchip chip;
+    struct kvm_ioapic_state *kioapic;
+    int ret, i;
+
+    chip.chip_id = KVM_IRQCHIP_IOAPIC;
+    ret = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, &chip);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_GET_IRQCHIP failed: %s\n", strerror(-ret));
+        abort();
+    }
+
+    kioapic = &chip.chip.ioapic;
+
+    s->id = kioapic->id;
+    s->ioregsel = kioapic->ioregsel;
+    s->irr = kioapic->irr;
+    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+        s->ioredtbl[i] = kioapic->redirtbl[i].bits;
+    }
+}
+
+static void kvm_ioapic_put(IOAPICCommonState *s)
+{
+    struct kvm_irqchip chip;
+    struct kvm_ioapic_state *kioapic;
+    int ret, i;
+
+    chip.chip_id = KVM_IRQCHIP_IOAPIC;
+    kioapic = &chip.chip.ioapic;
+
+    kioapic->id = s->id;
+    kioapic->ioregsel = s->ioregsel;
+    kioapic->base_address = s->busdev.mmio[0].addr;
+    kioapic->irr = s->irr;
+    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+        kioapic->redirtbl[i].bits = s->ioredtbl[i];
+    }
+
+    ret = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, &chip);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_SET_IRQCHIP failed: %s\n", strerror(-ret));
+        abort();
+    }
+}
+
+static void kvm_ioapic_reset(DeviceState *dev)
+{
+    IOAPICCommonState *s = IOAPIC_COMMON(dev);
+
+    ioapic_reset_common(dev);
+    kvm_ioapic_put(s);
+}
+
+static void kvm_ioapic_set_irq(void *opaque, int irq, int level)
+{
+    KVMIOAPICState *s = opaque;
+    IOAPICCommonState *common = IOAPIC_COMMON(s);
+    int delivered;
+
+    ioapic_stat_update_irq(common, irq, level);
+    delivered = kvm_set_irq(kvm_state, s->kvm_gsi_base + irq, level);
+    apic_report_irq_delivered(delivered);
+}
+
+static void kvm_ioapic_realize(DeviceState *dev, Error **errp)
+{
+    IOAPICCommonState *s = IOAPIC_COMMON(dev);
+
+    memory_region_init_io(&s->io_memory, OBJECT(dev), NULL, NULL, "kvm-ioapic", 0x1000);
+    /*
+     * KVM ioapic only supports 0x11 now. This will only be used when
+     * we want to dump ioapic version.
+     */
+    s->version = 0x11;
+
+    qdev_init_gpio_in(dev, kvm_ioapic_set_irq, IOAPIC_NUM_PINS);
+}
+
+static Property kvm_ioapic_properties[] = {
+    DEFINE_PROP_UINT32("gsi_base", KVMIOAPICState, kvm_gsi_base, 0),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+static void kvm_ioapic_class_init(ObjectClass *klass, void *data)
+{
+    IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    k->realize   = kvm_ioapic_realize;
+    k->pre_save  = kvm_ioapic_get;
+    k->post_load = kvm_ioapic_put;
+    dc->reset    = kvm_ioapic_reset;
+    device_class_set_props(dc, kvm_ioapic_properties);
+}
+
+static const TypeInfo kvm_ioapic_info = {
+    .name  = TYPE_KVM_IOAPIC,
+    .parent = TYPE_IOAPIC_COMMON,
+    .instance_size = sizeof(KVMIOAPICState),
+    .class_init = kvm_ioapic_class_init,
+};
+
+static void kvm_ioapic_register_types(void)
+{
+    type_register_static(&kvm_ioapic_info);
+}
+
+type_init(kvm_ioapic_register_types)