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, 155 insertions, 0 deletions

diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c
new file mode 100644
index 000000000..5319573e0
--- /dev/null
+++ b/accel/stubs/kvm-stub.c
@@ -0,0 +1,155 @@
+/*
+ * QEMU KVM stub
+ *
+ * Copyright Red Hat, Inc. 2010
+ *
+ * Author: Paolo Bonzini     <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/kvm.h"
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/pci/msi.h"
+#endif
+
+KVMState *kvm_state;
+bool kvm_kernel_irqchip;
+bool kvm_async_interrupts_allowed;
+bool kvm_eventfds_allowed;
+bool kvm_irqfds_allowed;
+bool kvm_resamplefds_allowed;
+bool kvm_msi_via_irqfd_allowed;
+bool kvm_gsi_routing_allowed;
+bool kvm_gsi_direct_mapping;
+bool kvm_allowed;
+bool kvm_readonly_mem_allowed;
+bool kvm_ioeventfd_any_length_allowed;
+bool kvm_msi_use_devid;
+
+void kvm_flush_coalesced_mmio_buffer(void)
+{
+}
+
+void kvm_cpu_synchronize_state(CPUState *cpu)
+{
+}
+
+bool kvm_has_sync_mmu(void)
+{
+    return false;
+}
+
+int kvm_has_many_ioeventfds(void)
+{
+    return 0;
+}
+
+int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
+{
+    return -ENOSYS;
+}
+
+int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
+                          target_ulong len, int type)
+{
+    return -EINVAL;
+}
+
+int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
+                          target_ulong len, int type)
+{
+    return -EINVAL;
+}
+
+void kvm_remove_all_breakpoints(CPUState *cpu)
+{
+}
+
+int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
+{
+    return 1;
+}
+
+int kvm_on_sigbus(int code, void *addr)
+{
+    return 1;
+}
+
+#ifndef CONFIG_USER_ONLY
+int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
+{
+    return -ENOSYS;
+}
+
+void kvm_init_irq_routing(KVMState *s)
+{
+}
+
+void kvm_irqchip_release_virq(KVMState *s, int virq)
+{
+}
+
+int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
+                                 PCIDevice *dev)
+{
+    return -ENOSYS;
+}
+
+void kvm_irqchip_commit_routes(KVMState *s)
+{
+}
+
+void kvm_irqchip_add_change_notifier(Notifier *n)
+{
+}
+
+void kvm_irqchip_remove_change_notifier(Notifier *n)
+{
+}
+
+void kvm_irqchip_change_notify(void)
+{
+}
+
+int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
+{
+    return -ENOSYS;
+}
+
+int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
+                                       EventNotifier *rn, int virq)
+{
+    return -ENOSYS;
+}
+
+int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
+                                          int virq)
+{
+    return -ENOSYS;
+}
+
+bool kvm_has_free_slot(MachineState *ms)
+{
+    return false;
+}
+
+void kvm_init_cpu_signals(CPUState *cpu)
+{
+    abort();
+}
+
+bool kvm_arm_supports_user_irq(void)
+{
+    return false;
+}
+
+bool kvm_dirty_ring_enabled(void)
+{
+    return false;
+}
+#endif