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70 lines
2.8 KiB
70 lines
2.8 KiB
From b1a68aebadecd7d339cf5eaffeda15099c998528 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 12 Sep 2023 19:10:37 -0400
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Subject: [PATCH 095/101] block-coroutine-wrapper: use
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qemu_get_current_aio_context()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 214: Remove AioContext lock
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RH-Jira: RHEL-15965
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Commit: [26/26] cde767bcdc626e90721792e3889952057a548ac5 (kmwolf/centos-qemu-kvm)
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Use qemu_get_current_aio_context() in mixed wrappers and coroutine
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wrappers so that code runs in the caller's AioContext instead of moving
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to the BlockDriverState's AioContext. This change is necessary for the
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multi-queue block layer where any thread can call into the block layer.
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Most wrappers are IO_CODE where it's safe to use the current AioContext
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nowadays. BlockDrivers and the core block layer use their own locks and
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no longer depend on the AioContext lock for thread-safety.
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The bdrv_create() wrapper invokes GLOBAL_STATE code. Using the current
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AioContext is safe because this code is only called with the BQL held
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from the main loop thread.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-ID: <20230912231037.826804-6-stefanha@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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scripts/block-coroutine-wrapper.py | 6 ++----
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1 file changed, 2 insertions(+), 4 deletions(-)
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diff --git a/scripts/block-coroutine-wrapper.py b/scripts/block-coroutine-wrapper.py
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index c9c09fcacd..dbbde99e39 100644
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--- a/scripts/block-coroutine-wrapper.py
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+++ b/scripts/block-coroutine-wrapper.py
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@@ -92,8 +92,6 @@ def __init__(self, wrapper_type: str, return_type: str, name: str,
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f"{self.name}")
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self.target_name = f'{subsystem}_{subname}'
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- self.ctx = self.gen_ctx()
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-
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self.get_result = 's->ret = '
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self.ret = 'return s.ret;'
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self.co_ret = 'return '
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@@ -167,7 +165,7 @@ def create_mixed_wrapper(func: FuncDecl) -> str:
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{func.co_ret}{name}({ func.gen_list('{name}') });
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}} else {{
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{struct_name} s = {{
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- .poll_state.ctx = {func.ctx},
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+ .poll_state.ctx = qemu_get_current_aio_context(),
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.poll_state.in_progress = true,
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{ func.gen_block(' .{name} = {name},') }
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@@ -191,7 +189,7 @@ def create_co_wrapper(func: FuncDecl) -> str:
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{func.return_type} {func.name}({ func.gen_list('{decl}') })
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{{
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{struct_name} s = {{
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- .poll_state.ctx = {func.ctx},
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+ .poll_state.ctx = qemu_get_current_aio_context(),
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.poll_state.in_progress = true,
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{ func.gen_block(' .{name} = {name},') }
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--
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2.39.3
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