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[RFC v2 6/8] stubs: add memory_region_from_host() and memory_region_get_
From: |
Stefan Hajnoczi |
Subject: |
[RFC v2 6/8] stubs: add memory_region_from_host() and memory_region_get_fd() |
Date: |
Tue, 5 Apr 2022 16:33:21 +0100 |
The blkio block driver will need to look up the file descriptor for a
given pointer. This is possible in softmmu builds where the memory 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
memory_region_get_fd() in that case.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
stubs/memory.c | 13 +++++++++++++
stubs/meson.build | 1 +
2 files changed, 14 insertions(+)
create mode 100644 stubs/memory.c
diff --git a/stubs/memory.c b/stubs/memory.c
new file mode 100644
index 0000000000..e9ec4e384b
--- /dev/null
+++ b/stubs/memory.c
@@ -0,0 +1,13 @@
+#include "qemu/osdep.h"
+#include "exec/memory.h"
+
+MemoryRegion *memory_region_from_host(void *host, ram_addr_t *offset)
+{
+ return NULL;
+}
+
+int memory_region_get_fd(MemoryRegion *mr)
+{
+ return -1;
+}
+
diff --git a/stubs/meson.build b/stubs/meson.build
index 6f80fec761..1e274d2db2 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -25,6 +25,7 @@ stub_ss.add(files('is-daemonized.c'))
if libaio.found()
stub_ss.add(files('linux-aio.c'))
endif
+stub_ss.add(files('memory.c'))
stub_ss.add(files('migr-blocker.c'))
stub_ss.add(files('module-opts.c'))
stub_ss.add(files('monitor.c'))
--
2.35.1
[RFC v2 3/8] block: pass size to bdrv_unregister_buf(), Stefan Hajnoczi, 2022/04/05
[RFC v2 4/8] block: add BDRV_REQ_REGISTERED_BUF request flag, Stefan Hajnoczi, 2022/04/05
[RFC v2 5/8] block: add BlockRAMRegistrar, Stefan Hajnoczi, 2022/04/05
[RFC v2 6/8] stubs: add memory_region_from_host() and memory_region_get_fd(),
Stefan Hajnoczi <=
[RFC v2 7/8] blkio: implement BDRV_REQ_REGISTERED_BUF optimization, Stefan Hajnoczi, 2022/04/05
[RFC v2 8/8] virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint, Stefan Hajnoczi, 2022/04/05
[RFC v2 2/8] numa: call ->ram_block_removed() in ram_block_notifer_remove(), Stefan Hajnoczi, 2022/04/05