Add virtio-input device and implement input support in the reference implementation

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["src/libkrun"]
+members = ["src/libkrun", "src/krun_input"]
 exclude = ["examples/gtk_display"]
 resolver = "2"
 

Makefile

@@ -1,5 +1,6 @@
 LIBRARY_HEADER = include/libkrun.h
 LIBRARY_HEADER_DISPLAY = include/libkrun_display.h
+LIBRARY_HEADER_INPUT = include/libkrun_input.h
 
 ABI_VERSION=1
 FULL_VERSION=1.15.1
@@ -58,6 +59,9 @@ endif
 ifeq ($(SND),1)
     FEATURE_FLAGS += --features snd
 endif
+ifeq ($(INPUT),1)
+    FEATURE_FLAGS += --features input
+endif
 ifeq ($(NITRO),1)
 	VARIANT = -nitro
 	FEATURE_FLAGS := --features nitro
@@ -147,6 +151,7 @@ install: libkrun.pc
 	install -d $(DESTDIR)$(PREFIX)/include
 	install -m 644 $(LIBRARY_HEADER) $(DESTDIR)$(PREFIX)/include
 	install -m 644 $(LIBRARY_HEADER_DISPLAY) $(DESTDIR)$(PREFIX)/include
+	install -m 644 $(LIBRARY_HEADER_INPUT) $(DESTDIR)$(PREFIX)/include
 	install -m 644 libkrun.pc $(DESTDIR)$(PREFIX)/$(LIBDIR_$(OS))/pkgconfig
 	install -m 755 $(LIBRARY_RELEASE_$(OS)) $(DESTDIR)$(PREFIX)/$(LIBDIR_$(OS))/
 	cd $(DESTDIR)$(PREFIX)/$(LIBDIR_$(OS))/ ; ln -sf $(KRUN_BINARY_$(OS)) $(KRUN_SONAME_$(OS)) ; ln -sf $(KRUN_SONAME_$(OS)) $(KRUN_BASE_$(OS))

include/libkrun.h

@@ -614,6 +614,23 @@ int32_t krun_display_set_refresh_rate(uint32_t ctx_id, uint32_t display_id, uint
  */
 int32_t krun_set_display_backend(uint32_t ctx_id, const void *display_backend, size_t backend_size);
 
+
+/**
+ * Adds an input device with separate config and events objects.
+ *
+ * Arguments:
+ *  "ctx_id"               - the configuration context ID
+ *  "config_backend"       - Pointer to a krun_input_config struct
+ *  "config_backend_size"  - sizeof() the krun_input_config struct
+ *  "events_backend"       - Pointer to a krun_input_event_provider struct
+ *  "events_backend_size"  - sizeof() the krun_input_event_provider struct
+ *
+ * Returns:
+ *  Zero on success or a negative error code otherwise.
+ */
+int krun_add_input_device(uint32_t ctx_id, const void *config_backend, size_t config_backend_size,
+                            const void *events_backend, size_t events_backend_size);
+
 /**
  * Enables or disables a virtio-snd device.
  *

include/libkrun_input.h

@@ -0,0 +1 @@
+../src/krun_input/libkrun_input.h

src/devices/Cargo.toml

@@ -13,6 +13,7 @@ blk = []
 efi = ["blk", "net"]
 gpu = ["rutabaga_gfx", "thiserror", "zerocopy", "krun_display"]
 snd = ["pw", "thiserror"]
+input = ["zerocopy", "krun_input"]
 virgl_resource_map2 = []
 nitro = []
 test_utils = []
@@ -31,6 +32,7 @@ virtio-bindings = "0.2.0"
 vm-memory = { version = ">=0.13", features = ["backend-mmap"] }
 zerocopy = { version = "0.8.26", optional = true, features = ["derive"] }
 krun_display = { path = "../krun_display", optional = true, features = ["bindgen_clang_runtime"] }
+krun_input = { path = "../krun_input", features = ["bindgen_clang_runtime"], optional = true }
 
 arch = { path = "../arch" }
 utils = { path = "../utils" }