[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[RFC v4 08/11] exec/cpu-common: add qemu_ram_get_fd()
From: |
Stefan Hajnoczi |
Subject: |
[RFC v4 08/11] exec/cpu-common: add qemu_ram_get_fd() |
Date: |
Mon, 22 Aug 2022 18:23:59 -0400 |
Add a function to get the file descriptor for a RAMBlock. Device
emulation code typically uses the MemoryRegion APIs but vhost-style code
may use RAMBlock directly for sharing guest memory with another process.
This new API will be used by the libblkio block driver so it can share
guest memory via .bdrv_register_buf().
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/exec/cpu-common.h | 1 +
softmmu/physmem.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index 2281be4e10..ccef44b3d3 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -90,6 +90,7 @@ void qemu_ram_set_uf_zeroable(RAMBlock *rb);
bool qemu_ram_is_migratable(RAMBlock *rb);
void qemu_ram_set_migratable(RAMBlock *rb);
void qemu_ram_unset_migratable(RAMBlock *rb);
+int qemu_ram_get_fd(RAMBlock *rb);
size_t qemu_ram_pagesize(RAMBlock *block);
size_t qemu_ram_pagesize_largest(void);
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index dc3c3e5f2e..f2bdad2583 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -1765,6 +1765,11 @@ void qemu_ram_unset_migratable(RAMBlock *rb)
rb->flags &= ~RAM_MIGRATABLE;
}
+int qemu_ram_get_fd(RAMBlock *rb)
+{
+ return rb->fd;
+}
+
/* Called with iothread lock held. */
void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState
*dev)
{
--
2.37.2
- [RFC v4 00/11] blkio: add libblkio BlockDriver, Stefan Hajnoczi, 2022/08/22
- [RFC v4 01/11] blkio: add libblkio block driver, 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 04/11] block: use BdrvRequestFlags type for supported flag fields, Stefan Hajnoczi, 2022/08/22
- [RFC v4 03/11] block: pass size to bdrv_unregister_buf(), 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 06/11] block: return errors from bdrv_register_buf(), Stefan Hajnoczi, 2022/08/22
- [RFC v4 08/11] exec/cpu-common: add qemu_ram_get_fd(),
Stefan Hajnoczi <=
- [RFC v4 09/11] stubs: add qemu_ram_block_from_host() and qemu_ram_get_fd(), Stefan Hajnoczi, 2022/08/22
- [RFC v4 11/11] virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint, Stefan Hajnoczi, 2022/08/22
[RFC v4 10/11] blkio: implement BDRV_REQ_REGISTERED_BUF optimization, Stefan Hajnoczi, 2022/08/22
Re: [RFC v4 00/11] blkio: add libblkio BlockDriver, Vladimir Sementsov-Ogievskiy, 2022/08/23