OpenE2K/qemu-e2k
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qemu-e2k/block
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Stefan Hajnoczi c5640b3e2f blkio: implement BDRV_REQ_REGISTERED_BUF optimization 
Avoid bounce buffers when QEMUIOVector elements are within previously
registered bdrv_register_buf() buffers.

The idea is that emulated storage controllers will register guest RAM
using bdrv_register_buf() and set the BDRV_REQ_REGISTERED_BUF on I/O
requests. Therefore no blkio_map_mem_region() calls are necessary in the
performance-critical I/O code path.

This optimization doesn't apply if the I/O buffer is internally
allocated by QEMU (e.g. qcow2 metadata). There we still take the slow
path because BDRV_REQ_REGISTERED_BUF is not set.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20221013185908.1297568-13-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2022-10-26 14:56:42 -04:00
..
export block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
monitor monitor: expose monitor_puts to rest of code 2022-10-06 11:53:40 +01:00
accounting.c block: add missed block_acct_setup with new block device init procedure 2022-09-30 18:42:34 +02:00
aio_task.c block/aio_task: assert max_busy_tasks is greater than 0 2021-10-05 18:56:41 +02:00
amend.c block/amend: Keep strong reference to BDS 2022-03-04 18:18:26 +01:00
backup.c block: simplify handling of try to merge different sized bitmaps 2022-06-24 17:07:06 +02:00
blkdebug.c block: use int64_t instead of int in driver discard handlers 2021-09-29 13:46:32 -05:00
blkio.c blkio: implement BDRV_REQ_REGISTERED_BUF optimization 2022-10-26 14:56:42 -04:00
blklogwrites.c block: Change bdrv_{pread,pwrite,pwrite_sync}() param order 2022-07-12 12:14:55 +02:00
blkreplay.c block: use int64_t instead of int in driver discard handlers 2021-09-29 13:46:32 -05:00
blkverify.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
block-backend.c block: return errors from bdrv_register_buf() 2022-10-26 14:56:42 -04:00
block-copy.c block/block-copy: block_copy(): add timeout_ns parameter 2022-06-29 10:56:12 +03:00
block-gen.h
block-ram-registrar.c block: add BlockRAMRegistrar 2022-10-26 14:56:42 -04:00
bochs.c block: Change bdrv_{pread,pwrite,pwrite_sync}() param order 2022-07-12 12:14:55 +02:00
cloop.c block: Make bdrv_{pread,pwrite}() return 0 on success 2022-07-12 12:14:55 +02:00
commit.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
copy-before-write.c copy-before-write: add missing coroutine_fn annotations 2022-10-07 12:11:41 +02:00
copy-before-write.h block/copy-before-write.h: global state API + assertions 2022-03-04 18:18:25 +01:00
copy-on-read.c block: use int64_t instead of int in driver discard handlers 2021-09-29 13:46:32 -05:00
copy-on-read.h Clean up ill-advised or unusual header guards 2022-05-11 16:50:01 +02:00
coroutines.h block: Remove remaining unused symbols in coroutines.h 2022-07-12 12:14:56 +02:00
create.c block_int-common.h: assertions in the callers of BlockDriver function pointers 2022-03-04 18:18:25 +01:00
crypto.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
crypto.h
curl.c curl: add missing coroutine_fn annotations 2022-10-07 12:11:41 +02:00
dirty-bitmap.c block: simplify handling of try to merge different sized bitmaps 2022-06-24 17:07:06 +02:00
dmg-bz2.c
dmg-lzfse.c
dmg.c block: Make bdrv_{pread,pwrite}() return 0 on success 2022-07-12 12:14:55 +02:00
dmg.h
file-posix.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
file-win32.c
filter-compress.c block: use int64_t instead of int in driver discard handlers 2021-09-29 13:46:32 -05:00
gluster.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
io_uring.c block/io_uring: add missing include file 2022-08-02 11:01:24 +02:00
io.c block: return errors from bdrv_register_buf() 2022-10-26 14:56:42 -04:00
iscsi-opts.c
iscsi.c iscsi: add missing coroutine_fn annotations 2022-10-07 12:11:40 +02:00
linux-aio.c misc: fix commonly doubled up words 2022-08-01 11:58:02 +02:00
meson.build block: add BlockRAMRegistrar 2022-10-26 14:56:42 -04:00
mirror.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
nbd.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
nfs.c nfs: add missing coroutine_fn annotations 2022-10-07 12:11:40 +02:00
null.c
nvme.c block: return errors from bdrv_register_buf() 2022-10-26 14:56:42 -04:00
parallels-ext.c block: Change bdrv_{pread,pwrite,pwrite_sync}() param order 2022-07-12 12:14:55 +02:00
parallels.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
parallels.h
preallocate.c block: fix preallocate filter: don't do unaligned preallocate requests 2022-03-07 09:19:20 +01:00
progress_meter.c
qapi-sysemu.c block: add 'force' parameter to 'blockdev-change-medium' command 2022-04-25 12:02:36 +02:00
qapi.c
qcow2-bitmap.c block/qcow2-bitmap: Add missing cast to silent GCC error 2022-09-30 18:02:30 +02:00
qcow2-cache.c block: Change bdrv_{pread,pwrite,pwrite_sync}() param order 2022-07-12 12:14:55 +02:00
qcow2-cluster.c qcow2: add missing coroutine_fn annotations 2022-10-07 12:11:40 +02:00
qcow2-refcount.c qcow2: add missing coroutine_fn annotations 2022-10-07 12:11:40 +02:00
qcow2-snapshot.c block: Use bdrv_co_pwrite_sync() when caller is coroutine_fn 2022-07-12 12:14:56 +02:00
qcow2-threads.c
qcow2.c qcow2: add missing coroutine_fn annotations 2022-10-07 12:11:40 +02:00
qcow2.h qcow2: add missing coroutine_fn annotations 2022-10-07 12:11:40 +02:00
qcow.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
qed-check.c
qed-cluster.c
qed-l2-cache.c osdep: Move memalign-related functions to their own header 2022-03-07 13:16:49 +00:00
qed-table.c osdep: Move memalign-related functions to their own header 2022-03-07 13:16:49 +00:00
qed.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
qed.h
quorum.c quorum: Remove unnecessary forward declaration 2022-10-07 12:11:41 +02:00
raw-format.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
rbd.c block/rbd: report a better error when namespace does not exist 2022-06-24 17:07:06 +02:00
replication.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
reqlist.c block/reqlist: add reqlist_wait_all() 2022-03-07 09:33:30 +01:00
snapshot-access.c block: introduce snapshot-access block driver 2022-03-07 09:33:31 +01:00
snapshot.c include/block/snapshot: global state API + assertions 2022-03-04 18:18:25 +01:00
ssh.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
stream.c block/stream: Drain subtree around graph change 2022-03-29 16:30:55 +02:00
throttle-groups.c
throttle.c throttle: add missing coroutine_fn annotations 2022-10-07 12:11:41 +02:00
trace-events nbd: trace long NBD operations 2022-06-29 10:57:02 +03:00
trace.h
vdi.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
vhdx-endian.c
vhdx-log.c block: Change bdrv_{pread,pwrite,pwrite_sync}() param order 2022-07-12 12:14:55 +02:00
vhdx.c block: add BDRV_REQ_REGISTERED_BUF request flag 2022-10-26 14:56:42 -04:00
vhdx.h
vmdk.c vmdk: add missing coroutine_fn annotations 2022-10-07 12:11:41 +02:00
vpc.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
vvfat.c block: Change bdrv_{pread,pwrite,pwrite_sync}() param order 2022-07-12 12:14:55 +02:00
win32-aio.c osdep: Move memalign-related functions to their own header 2022-03-07 13:16:49 +00:00
write-threshold.c