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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>
This commit is contained in:
Alexander Bulekov 2023-04-27 17:10:07 -04:00 • committed by Thomas Huth
parent a2e1753b80
commit 9c86c97f12
7 changed files with 52 additions and 8 deletions
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7
include/qemu/main-loop.h
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@ -387,9 +387,12 @@ void qemu_cond_timedwait_iothread(QemuCond *cond, int ms);
/* internal interfaces */
#define qemu_bh_new_guarded(cb, opaque, guard) \
qemu_bh_new_full((cb), (opaque), (stringify(cb)), guard)
#define qemu_bh_new(cb, opaque) \
qemu_bh_new_full((cb), (opaque), (stringify(cb)))
QEMUBH *qemu_bh_new_full(QEMUBHFunc *cb, void *opaque, const char *name);
qemu_bh_new_full((cb), (opaque), (stringify(cb)), NULL)
QEMUBH *qemu_bh_new_full(QEMUBHFunc *cb, void *opaque, const char *name,
MemReentrancyGuard *reentrancy_guard);
void qemu_bh_schedule_idle(QEMUBH *bh);
enum {