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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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18
include/block/aio.h
View file

@ -23,6 +23,8 @@
#include "qemu/thread.h"
#include "qemu/timer.h"
#include "block/graph-lock.h"
#include "hw/qdev-core.h"
typedef struct BlockAIOCB BlockAIOCB;
typedef void BlockCompletionFunc(void *opaque, int ret);
@ -323,9 +325,11 @@ void aio_bh_schedule_oneshot_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque,
* is opaque and must be allocated prior to its use.
*
* @name: A human-readable identifier for debugging purposes.
* @reentrancy_guard: A guard set when entering a cb to prevent
* device-reentrancy issues
*/
QEMUBH *aio_bh_new_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque,
const char *name);
const char *name, MemReentrancyGuard *reentrancy_guard);
/**
* aio_bh_new: Allocate a new bottom half structure
@ -334,7 +338,17 @@ QEMUBH *aio_bh_new_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque,
* string.
*/
#define aio_bh_new(ctx, cb, opaque) \
aio_bh_new_full((ctx), (cb), (opaque), (stringify(cb)))
aio_bh_new_full((ctx), (cb), (opaque), (stringify(cb)), NULL)
/**
* aio_bh_new_guarded: Allocate a new bottom half structure with a
* reentrancy_guard
*
* A convenience wrapper for aio_bh_new_full() that uses the cb as the name
* string.
*/
#define aio_bh_new_guarded(ctx, cb, opaque, guard) \
aio_bh_new_full((ctx), (cb), (opaque), (stringify(cb)), guard)
/**
* aio_notify: Force processing of pending events.