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[RFC v4 09/11] stubs: add qemu_ram_block_from_host() and qemu_ram_get_fd
From: |
Stefan Hajnoczi |
Subject: |
[RFC v4 09/11] stubs: add qemu_ram_block_from_host() and qemu_ram_get_fd() |
Date: |
Mon, 22 Aug 2022 18:24:00 -0400 |
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>
---
stubs/physmem.c | 13 +++++++++++++
stubs/meson.build | 1 +
2 files changed, 14 insertions(+)
create mode 100644 stubs/physmem.c
diff --git a/stubs/physmem.c b/stubs/physmem.c
new file mode 100644
index 0000000000..1fc5f2df29
--- /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;
+}
diff --git a/stubs/meson.build b/stubs/meson.build
index d8f3fd5c44..4314161f5f 100644
--- 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'))
--
2.37.2
- [RFC v4 01/11] blkio: add libblkio block driver, (continued)
- [RFC v4 01/11] blkio: add libblkio block driver, Stefan Hajnoczi, 2022/08/22
- [RFC v4 03/11] block: pass size to bdrv_unregister_buf(), Stefan Hajnoczi, 2022/08/22
- [RFC v4 04/11] block: use BdrvRequestFlags type for supported flag fields, Stefan Hajnoczi, 2022/08/22
- [RFC v4 06/11] block: return errors from bdrv_register_buf(), Stefan Hajnoczi, 2022/08/22
- [RFC v4 02/11] numa: call ->ram_block_removed() in ram_block_notifer_remove(), Stefan Hajnoczi, 2022/08/22
- [RFC v4 05/11] block: add BDRV_REQ_REGISTERED_BUF request flag, Stefan Hajnoczi, 2022/08/22
- [RFC v4 07/11] block: add BlockRAMRegistrar, Stefan Hajnoczi, 2022/08/22
- [RFC v4 08/11] exec/cpu-common: add qemu_ram_get_fd(), Stefan Hajnoczi, 2022/08/22
- [RFC v4 09/11] stubs: add qemu_ram_block_from_host() and qemu_ram_get_fd(),
Stefan Hajnoczi <=
- [RFC v4 10/11] blkio: implement BDRV_REQ_REGISTERED_BUF optimization, Stefan Hajnoczi, 2022/08/22
- [RFC v4 11/11] virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint, Stefan Hajnoczi, 2022/08/22
Re: [RFC v4 00/11] blkio: add libblkio BlockDriver, Vladimir Sementsov-Ogievskiy, 2022/08/23