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async: Add an optional reentrancy guard to the BH API

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Devices can pass their MemoryReentrancyGuard (from their DeviceState),
when creating new BHes. Then, the async API will toggle the guard
before/after calling the BH call-back. This prevents bh->mmio reentrancy
issues.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20230427211013.2994127-3-alxndr@bu.edu>
[thuth: Fix "line over 90 characters" checkpatch.pl error]
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 9c86c97f12)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
[mjt: minor context adjustment in include/block/aio.h and include/qemu/main-loop.h for 7.2]
This commit is contained in:
Alexander Bulekov
2023-04-27 17:10:07 -04:00
committed by Michael Tokarev
parent c40ca2301c
commit 61dacb401b
7 changed files with 52 additions and 8 deletions
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6
util/main-loop.c
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@@ -619,9 +619,11 @@ void main_loop_wait(int nonblocking)
/* Functions to operate on the main QEMU AioContext. */
QEMUBH *qemu_bh_new_full(QEMUBHFunc *cb, void *opaque, const char *name)
QEMUBH *qemu_bh_new_full(QEMUBHFunc *cb, void *opaque, const char *name,
MemReentrancyGuard *reentrancy_guard)
{
return aio_bh_new_full(qemu_aio_context, cb, opaque, name);
return aio_bh_new_full(qemu_aio_context, cb, opaque, name,
reentrancy_guard);
}
/*