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diff --git a/usr.sbin/bhyve/qemu_fwcfg.h b/usr.sbin/bhyve/qemu_fwcfg.h
--- a/usr.sbin/bhyve/qemu_fwcfg.h
+++ b/usr.sbin/bhyve/qemu_fwcfg.h
@@ -18,4 +18,6 @@
uint8_t *data;
};
+int qemu_fwcfg_add_file(const uint8_t name[QEMU_FWCFG_MAX_NAME],
+ const uint32_t size, void *const data);
int qemu_fwcfg_init(struct vmctx *const ctx);
diff --git a/usr.sbin/bhyve/qemu_fwcfg.c b/usr.sbin/bhyve/qemu_fwcfg.c
--- a/usr.sbin/bhyve/qemu_fwcfg.c
+++ b/usr.sbin/bhyve/qemu_fwcfg.c
@@ -43,6 +43,8 @@
#define QEMU_FWCFG_INDEX_ID 0x01
#define QEMU_FWCFG_INDEX_FILE_DIR 0x19
+#define QEMU_FWCFG_FIRST_FILE_INDEX 0x20
+
#define QEMU_FWCFG_MIN_FILES 10
#pragma pack(1)
@@ -87,6 +89,7 @@
union qemu_fwcfg_selector selector;
struct qemu_fwcfg_item items[QEMU_FWCFG_MAX_ARCHS]
[QEMU_FWCFG_MAX_ENTRIES];
+ struct qemu_fwcfg_directory *directory;
};
static struct qemu_fwcfg_softc fwcfg_sc;
@@ -256,6 +259,93 @@
return (register_inout(&iop));
}
+int
+qemu_fwcfg_add_file(const uint8_t name[QEMU_FWCFG_MAX_NAME],
+ const uint32_t size, void *const data)
+{
+ /*
+ * QEMU specifies count as big endian.
+ * Convert it to host endian to work with it.
+ */
+ const uint32_t count = be32toh(fwcfg_sc.directory->be_count) + 1;
+
+ /* add file to items list */
+ const uint32_t index = QEMU_FWCFG_FIRST_FILE_INDEX + count - 1;
+ const int error = qemu_fwcfg_add_item(QEMU_FWCFG_ARCHITECTURE_GENERIC,
+ index, size, data);
+ if (error != 0) {
+ return (error);
+ }
+
+ /*
+ * files should be sorted alphabetical, get index for new file
+ */
+ uint32_t file_index;
+ for (file_index = 0; file_index < count - 1; ++file_index) {
+ if (strcmp(name, fwcfg_sc.directory->files[file_index].name) <
+ 0)
+ break;
+ }
+
+ if (count > QEMU_FWCFG_MIN_FILES) {
+ /* alloc new file directory */
+ const uint64_t new_size = sizeof(struct qemu_fwcfg_directory) +
+ count * sizeof(struct qemu_fwcfg_file);
+ struct qemu_fwcfg_directory *const new_directory = calloc(1,
+ new_size);
+ if (new_directory == NULL) {
+ warnx(
+ "%s: Unable to allocate a new qemu fwcfg files directory (count %d)",
+ __func__, count);
+ return (-ENOMEM);
+ }
+
+ /* copy files below file_index to new directory */
+ memcpy(new_directory->files, fwcfg_sc.directory->files,
+ file_index * sizeof(struct qemu_fwcfg_file));
+
+ /* copy files above file_index to directory */
+ memcpy(&new_directory->files[file_index + 1],
+ &fwcfg_sc.directory->files[file_index],
+ (count - file_index) * sizeof(struct qemu_fwcfg_file));
+
+ /* free old directory */
+ free(fwcfg_sc.directory);
+
+ /* set directory pointer to new directory */
+ fwcfg_sc.directory = new_directory;
+
+ /* adjust directory pointer */
+ fwcfg_sc.items[0][QEMU_FWCFG_INDEX_FILE_DIR].data =
+ (uint8_t *)fwcfg_sc.directory;
+ } else {
+ /* shift files behind file_index */
+ for (uint32_t i = QEMU_FWCFG_MIN_FILES - 1; i > file_index;
+ --i) {
+ memcpy(&fwcfg_sc.directory->files[i],
+ &fwcfg_sc.directory->files[i - 1],
+ sizeof(struct qemu_fwcfg_file));
+ }
+ }
+
+ /*
+ * QEMU specifies count, size and index as big endian.
+ * Save these values in big endian to simplify guest reads of these
+ * values.
+ */
+ fwcfg_sc.directory->be_count = htobe32(count);
+ fwcfg_sc.directory->files[file_index].be_size = htobe32(size);
+ fwcfg_sc.directory->files[file_index].be_selector = htobe16(index);
+ strcpy(fwcfg_sc.directory->files[file_index].name, name);
+
+ /* set new size for the fwcfg_file_directory */
+ fwcfg_sc.items[0][QEMU_FWCFG_INDEX_FILE_DIR].size =
+ sizeof(struct qemu_fwcfg_directory) +
+ count * sizeof(struct qemu_fwcfg_file);
+
+ return (0);
+}
+
int
qemu_fwcfg_init(struct vmctx *const ctx)
{

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