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[PATCH v6 10/13] exec/cpu-common: add qemu_ram_get_fd()
From: |
Stefan Hajnoczi |
Subject: |
[PATCH v6 10/13] exec/cpu-common: add qemu_ram_get_fd() |
Date: |
Thu, 6 Oct 2022 17:35:04 -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 c493510ee9..6feaa40ca7 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -92,6 +92,7 @@ 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 56e03e07b5..d9578ccfd4 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -1748,6 +1748,11 @@ 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)
{
--
2.37.3
- Re: [PATCH v6 09/13] block: add BlockRAMRegistrar, (continued)
[PATCH v6 04/13] block: pass size to bdrv_unregister_buf(), Stefan Hajnoczi, 2022/10/06
[PATCH v6 08/13] numa: use QLIST_FOREACH_SAFE() for RAM block notifiers, Stefan Hajnoczi, 2022/10/06
[PATCH v6 06/13] block: add BDRV_REQ_REGISTERED_BUF request flag, Stefan Hajnoczi, 2022/10/06
[PATCH v6 07/13] block: return errors from bdrv_register_buf(), Stefan Hajnoczi, 2022/10/06
[PATCH v6 13/13] virtio-blk: use BDRV_REQ_REGISTERED_BUF optimization hint, Stefan Hajnoczi, 2022/10/06
[PATCH v6 11/13] stubs: add qemu_ram_block_from_host() and qemu_ram_get_fd(), Stefan Hajnoczi, 2022/10/06
[PATCH v6 10/13] exec/cpu-common: add qemu_ram_get_fd(),
Stefan Hajnoczi <=
[PATCH v6 12/13] blkio: implement BDRV_REQ_REGISTERED_BUF optimization, Stefan Hajnoczi, 2022/10/06
Re: [PATCH v6 00/13] blkio: add libblkio BlockDriver, Alberto Faria, 2022/10/10