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[RFC 6/8] stubs: add memory_region_from_host() and memory_region_get_fd(
From: |
Stefan Hajnoczi |
Subject: |
[RFC 6/8] stubs: add memory_region_from_host() and memory_region_get_fd() |
Date: |
Wed, 23 Mar 2022 11:17:25 +0000 |
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 0/8] blkio: add libblkio BlockDriver, Stefan Hajnoczi, 2022/03/23
- [RFC 1/8] blkio: add io_uring block driver using libblkio, Stefan Hajnoczi, 2022/03/23
- [RFC 2/8] numa: call ->ram_block_removed() in ram_block_notifer_remove(), Stefan Hajnoczi, 2022/03/23
- [RFC 4/8] block: add BDRV_REQ_REGISTERED_BUF request flag, Stefan Hajnoczi, 2022/03/23
- [RFC 5/8] block: add BlockRAMRegistrar, Stefan Hajnoczi, 2022/03/23
- [RFC 6/8] stubs: add memory_region_from_host() and memory_region_get_fd(),
Stefan Hajnoczi <=
- [RFC 8/8] virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint, Stefan Hajnoczi, 2022/03/23
- [RFC 3/8] block: pass size to bdrv_unregister_buf(), Stefan Hajnoczi, 2022/03/23
- [RFC 7/8] blkio: implement BDRV_REQ_REGISTERED_BUF optimization, Stefan Hajnoczi, 2022/03/23
- Re: [RFC 0/8] blkio: add libblkio BlockDriver, Stefano Garzarella, 2022/03/29