stubs: add qemu_ram_block_from_host() and qemu_ram_get_fd()

The blkio block driver will need to look up the file descriptor for a
given pointer. This is possible in softmmu builds where the RAMBlock API
is available for querying guest RAM.

Add stubs so tools like qemu-img that link the block layer still build
successfully. In this case there is no guest RAM but that is fine.
Bounce buffers and their file descriptors will be allocated with
libblkio's blkio_alloc_mem_region() so we won't rely on QEMU's
qemu_ram_get_fd() in that case.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20221013185908.1297568-12-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/stubs/meson.build b/stubs/meson.build
index d8f3fd5c44f2ad3254f94ba776915d8101bd8ae8..4314161f5fc8a51e156905a27c91c40657495818 100644 (file)
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -29,6 +29,7 @@ stub_ss.add(files('migr-blocker.c'))
 stub_ss.add(files('module-opts.c'))
 stub_ss.add(files('monitor.c'))
 stub_ss.add(files('monitor-core.c'))
+stub_ss.add(files('physmem.c'))
 stub_ss.add(files('qemu-timer-notify-cb.c'))
 stub_ss.add(files('qmp_memory_device.c'))
 stub_ss.add(files('qmp-command-available.c'))

diff --git a/stubs/physmem.c b/stubs/physmem.c
new file mode 100644 (file)
index 0000000..1fc5f2d
--- /dev/null
+++ b/stubs/physmem.c
@@ -0,0 +1,13 @@
+#include "qemu/osdep.h"
+#include "exec/cpu-common.h"
+
+RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
+                                   ram_addr_t *offset)
+{
+    return NULL;
+}
+
+int qemu_ram_get_fd(RAMBlock *rb)
+{
+    return -1;
+}