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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=156.151.31.86; envelope-from=david.edmondson@oracle.com; helo=userp2130.oracle.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Stefan Weil , Max Reitz , David Edmondson , Stefan Hajnoczi , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @oracle.onmicrosoft.com) If a new bitmap entry is allocated, requiring the entire block to be written, avoiding leaking the buffer allocated for the block should the write fail. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: David Edmondson --- block/vdi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/vdi.c b/block/vdi.c index 5627e7d764..2a6dc26124 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -690,6 +690,7 @@ nonallocating_write: =20 logout("finished data write\n"); if (ret < 0) { + g_free(block); return ret; } =20 --=20 2.30.1 From nobody Mon Feb 9 08:02:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=oracle.com); dmarc=pass(p=none dis=none) header.from=oracle.com ARC-Seal: i=2; a=rsa-sha256; t=1615302707; cv=pass; d=zohomail.com; s=zohoarc; b=J7oteH1MaZKJmFtlh/3aCa1UsTDAGomOCq+qs52qXGqBjgDp7bUmws+p2kR5/K9j/T+9dwpT4+iQ1LhkvisN45UvYMEmApxMJ4U9ZYLZua+W6Plyn4FBIZNIJuOVZ78E2mraFEvwFyX9RxmxRznA9e5BfpVjOZnrKKFM8v/rlPA= ARC-Message-Signature: i=2; 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charset="utf-8" Given that the block size is read from the header of the VDI file, a wide variety of sizes might be seen. Rather than re-using a block sized memory region when writing the VDI header, allocate an appropriately sized buffer. Signed-off-by: David Edmondson --- block/vdi.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/block/vdi.c b/block/vdi.c index 2a6dc26124..548f8a057b 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -696,18 +696,20 @@ nonallocating_write: =20 if (block) { /* One or more new blocks were allocated. */ - VdiHeader *header =3D (VdiHeader *) block; + VdiHeader *header; uint8_t *base; uint64_t offset; uint32_t n_sectors; =20 + g_free(block); + header =3D g_malloc(sizeof(*header)); + logout("now writing modified header\n"); assert(VDI_IS_ALLOCATED(bmap_first)); *header =3D s->header; vdi_header_to_le(header); - ret =3D bdrv_pwrite(bs->file, 0, block, sizeof(VdiHeader)); - g_free(block); - block =3D NULL; + ret =3D bdrv_pwrite(bs->file, 0, header, sizeof(*header)); + g_free(header); =20 if (ret < 0) { return ret; --=20 2.30.1 From nobody Mon Feb 9 08:02:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=156.151.31.86; envelope-from=david.edmondson@oracle.com; helo=userp2130.oracle.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Stefan Weil , Max Reitz , David Edmondson , Stefan Hajnoczi , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @oracle.onmicrosoft.com) When taking the slow path for mutex acquisition, set the coroutine value in the CoWaitRecord in push_waiter(), rather than both there and in the caller. Reviewed-by: Paolo Bonzini Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: David Edmondson --- util/qemu-coroutine-lock.c | 1 - 1 file changed, 1 deletion(-) diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c index 5816bf8900..eb73cf11dc 100644 --- a/util/qemu-coroutine-lock.c +++ b/util/qemu-coroutine-lock.c @@ -204,7 +204,6 @@ static void coroutine_fn qemu_co_mutex_lock_slowpath(Ai= oContext *ctx, unsigned old_handoff; =20 trace_qemu_co_mutex_lock_entry(mutex, self); - w.co =3D self; push_waiter(mutex, &w); =20 /* This is the "Responsibility Hand-Off" protocol; a lock() picks from --=20 2.30.1 From nobody Mon Feb 9 08:02:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1dmarc=pass fromdomain=oracle.com); dmarc=pass(p=none dis=none) header.from=oracle.com ARC-Seal: i=2; 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charset="utf-8" Test that downgrading an rwlock does not result in a failure to schedule coroutines queued on the rwlock. The diagram associated with test_co_rwlock_downgrade() describes the intended behaviour, but what is observed currently corresponds to: | c1 | c2 | c3 | c4 | |--------+------------+------------+----------| | rdlock | | | | | yield | | | | | | wrlock | | | | | | | | | | | rdlock | | | | | | | | | | | wrlock | | | | | | | unlock | | | | | yield | | | | | | | | | | | downgrade | | | | | ... | | | | | unlock | | | | | | | | | | | | | In the test, this results in a failure... ERROR:../tests/test-coroutine.c:369:test_co_rwlock_downgrade: assertion fai= led: (c3_done) Bail out! ERROR:../tests/test-coroutine.c:369:test_co_rwlock_downgrade: ass= ertion failed: (c3_done) ...as a result of the c3 coroutine failing to run to completion. Signed-off-by: David Edmondson --- tests/test-coroutine.c | 112 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) diff --git a/tests/test-coroutine.c b/tests/test-coroutine.c index e946d93a65..62b0092721 100644 --- a/tests/test-coroutine.c +++ b/tests/test-coroutine.c @@ -264,6 +264,117 @@ static void test_co_mutex_lockable(void) g_assert(QEMU_MAKE_LOCKABLE(null_pointer) =3D=3D NULL); } =20 +static bool c1_done; +static bool c2_done; +static bool c3_done; +static bool c4_done; + +static void coroutine_fn rwlock_c1(void *opaque) +{ + CoRwlock *l =3D opaque; + + qemu_co_rwlock_rdlock(l); + qemu_coroutine_yield(); + + qemu_co_rwlock_unlock(l); + qemu_coroutine_yield(); + + c1_done =3D true; +} + +static void coroutine_fn rwlock_c2(void *opaque) +{ + CoRwlock *l =3D opaque; + + qemu_co_rwlock_wrlock(l); + + qemu_co_rwlock_downgrade(l); + qemu_co_rwlock_unlock(l); + c2_done =3D true; +} + +static void coroutine_fn rwlock_c3(void *opaque) +{ + CoRwlock *l =3D opaque; + + qemu_co_rwlock_rdlock(l); + + qemu_co_rwlock_unlock(l); + c3_done =3D true; +} + +static void coroutine_fn rwlock_c4(void *opaque) +{ + CoRwlock *l =3D opaque; + + qemu_co_rwlock_wrlock(l); + + qemu_co_rwlock_unlock(l); + c4_done =3D true; +} + +/* + * Check that downgrading a reader-writer lock does not cause a hang. + * + * Four coroutines are used to produce a situation where there are + * both reader and writer hopefuls waiting to acquire an rwlock that + * is held by a reader. + * + * The correct sequence of operations we aim to provoke can be + * represented as: + * + * | c1 | c2 | c3 | c4 | + * |--------+------------+------------+------------| + * | rdlock | | | | + * | yield | | | | + * | | wrlock | | | + * | | | | | + * | | | rdlock | | + * | | | | | + * | | | | wrlock | + * | | | | | + * | unlock | | | | + * | yield | | | | + * | | | | | + * | | downgrade | | | + * | | ... | | | + * | | unlock | | | + * | | | | | + * | | | | unlock | + * | | | | | + * | | | unlock | | + * + * Significantly, when c2 unlocks the downgraded lock, it should be c4 + * that is run rather than c3. + */ +static void test_co_rwlock_downgrade(void) +{ + CoRwlock l; + Coroutine *c1, *c2, *c3, *c4; + + qemu_co_rwlock_init(&l); + + c1 =3D qemu_coroutine_create(rwlock_c1, &l); + c2 =3D qemu_coroutine_create(rwlock_c2, &l); + c3 =3D qemu_coroutine_create(rwlock_c3, &l); + c4 =3D qemu_coroutine_create(rwlock_c4, &l); + + qemu_coroutine_enter(c1); + qemu_coroutine_enter(c2); + qemu_coroutine_enter(c3); + qemu_coroutine_enter(c4); + + qemu_coroutine_enter(c1); + + g_assert(c2_done); + g_assert(c3_done); + g_assert(c4_done); + + qemu_coroutine_enter(c1); + + g_assert(c1_done); +} + /* * Check that creation, enter, and return work */ @@ -501,6 +612,7 @@ int main(int argc, char **argv) g_test_add_func("/basic/order", test_order); g_test_add_func("/locking/co-mutex", test_co_mutex); g_test_add_func("/locking/co-mutex/lockable", test_co_mutex_lockable); + g_test_add_func("/locking/co-rwlock/downgrade", test_co_rwlock_downgra= de); if (g_test_perf()) { g_test_add_func("/perf/lifecycle", perf_lifecycle); g_test_add_func("/perf/nesting", perf_nesting); --=20 2.30.1 From nobody Mon Feb 9 08:02:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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charset="utf-8" A feature of the current rwlock is that if multiple coroutines hold a reader lock, all must be runnable. The unlock implementation relies on this, choosing to wake a single coroutine when the final read lock holder exits the critical section, assuming that it will wake a coroutine attempting to acquire a write lock. The downgrade implementation violates this assumption by creating a read lock owning coroutine that is exclusively runnable - any other coroutines that are waiting to acquire a read lock are *not* made runnable when the write lock holder converts its ownership to read only. As a result of this, a coroutine that downgrades a write lock can later cause unlock to wake a coroutine that is attempting to acquire a read lock rather than one aiming for a write lock, should the coroutines be so ordered in the wait queue. If the wait queue contains both read hopefuls and write hopefuls, any read hopeful coroutine that is woken will immediately go back onto the wait queue when it attempts to acquire the rwlock, due to the pending write acquisition. At this point there are no coroutines holding either read or write locks and no way for the coroutines in the queue to be made runnable. A hang ensues. Address this by using separate queues for coroutines attempting to acquire read and write ownership of the rwlock. When unlocking, prefer to make runnable a coroutine that is waiting for a write lock, but if none is available, make all coroutines waiting to take a read lock runnable. Signed-off-by: David Edmondson --- include/qemu/coroutine.h | 8 +++++--- util/qemu-coroutine-lock.c | 24 +++++++++++++++--------- 2 files changed, 20 insertions(+), 12 deletions(-) diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h index 84eab6e3bf..3dfbf57faf 100644 --- a/include/qemu/coroutine.h +++ b/include/qemu/coroutine.h @@ -241,7 +241,8 @@ typedef struct CoRwlock { int pending_writer; int reader; CoMutex mutex; - CoQueue queue; + CoQueue rqueue; + CoQueue wqueue; } CoRwlock; =20 /** @@ -283,8 +284,9 @@ void qemu_co_rwlock_downgrade(CoRwlock *lock); void qemu_co_rwlock_wrlock(CoRwlock *lock); =20 /** - * Unlocks the read/write lock and schedules the next coroutine that was - * waiting for this lock to be run. + * Unlocks the read/write lock and schedules the next coroutine that + * was waiting for this lock to be run, preferring to wake one + * attempting to take a write lock over those taking a read lock. */ void qemu_co_rwlock_unlock(CoRwlock *lock); =20 diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c index eb73cf11dc..c05c143142 100644 --- a/util/qemu-coroutine-lock.c +++ b/util/qemu-coroutine-lock.c @@ -330,7 +330,8 @@ void coroutine_fn qemu_co_mutex_unlock(CoMutex *mutex) void qemu_co_rwlock_init(CoRwlock *lock) { memset(lock, 0, sizeof(*lock)); - qemu_co_queue_init(&lock->queue); + qemu_co_queue_init(&lock->rqueue); + qemu_co_queue_init(&lock->wqueue); qemu_co_mutex_init(&lock->mutex); } =20 @@ -341,7 +342,7 @@ void qemu_co_rwlock_rdlock(CoRwlock *lock) qemu_co_mutex_lock(&lock->mutex); /* For fairness, wait if a writer is in line. */ while (lock->pending_writer) { - qemu_co_queue_wait(&lock->queue, &lock->mutex); + qemu_co_queue_wait(&lock->rqueue, &lock->mutex); } lock->reader++; qemu_co_mutex_unlock(&lock->mutex); @@ -356,17 +357,22 @@ void qemu_co_rwlock_unlock(CoRwlock *lock) =20 assert(qemu_in_coroutine()); if (!lock->reader) { - /* The critical section started in qemu_co_rwlock_wrlock. */ - qemu_co_queue_restart_all(&lock->queue); + /* The critical section started in qemu_co_rwlock_wrlock or + * qemu_co_rwlock_upgrade. + */ + qemu_co_queue_restart_all(&lock->wqueue); + qemu_co_queue_restart_all(&lock->rqueue); } else { self->locks_held--; =20 qemu_co_mutex_lock(&lock->mutex); lock->reader--; assert(lock->reader >=3D 0); - /* Wakeup only one waiting writer */ - if (!lock->reader) { - qemu_co_queue_next(&lock->queue); + /* If there are no remaining readers wake one waiting writer + * or all waiting readers. + */ + if (!lock->reader && !qemu_co_queue_next(&lock->wqueue)) { + qemu_co_queue_restart_all(&lock->rqueue); } } qemu_co_mutex_unlock(&lock->mutex); @@ -392,7 +398,7 @@ void qemu_co_rwlock_wrlock(CoRwlock *lock) qemu_co_mutex_lock(&lock->mutex); lock->pending_writer++; while (lock->reader) { - qemu_co_queue_wait(&lock->queue, &lock->mutex); + qemu_co_queue_wait(&lock->wqueue, &lock->mutex); } lock->pending_writer--; =20 @@ -411,7 +417,7 @@ void qemu_co_rwlock_upgrade(CoRwlock *lock) lock->reader--; lock->pending_writer++; while (lock->reader) { - qemu_co_queue_wait(&lock->queue, &lock->mutex); + qemu_co_queue_wait(&lock->wqueue, &lock->mutex); } lock->pending_writer--; =20 --=20 2.30.1 From nobody Mon Feb 9 08:02:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=141.146.126.79; envelope-from=david.edmondson@oracle.com; helo=aserp2130.oracle.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org, Stefan Weil , Max Reitz , David Edmondson , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @oracle.onmicrosoft.com) Content-Type: text/plain; charset="utf-8" Given that we know whether the queued coroutines are reader hopefuls or writer hopefuls, avoid marking all of the queued coroutines as runnable when unlocking, choosing instead to wake a single queued writer or all queued readers. Suggested-by: Paolo Bonzini Signed-off-by: David Edmondson --- util/qemu-coroutine-lock.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c index c05c143142..6e399f28c1 100644 --- a/util/qemu-coroutine-lock.c +++ b/util/qemu-coroutine-lock.c @@ -356,24 +356,20 @@ void qemu_co_rwlock_unlock(CoRwlock *lock) Coroutine *self =3D qemu_coroutine_self(); =20 assert(qemu_in_coroutine()); - if (!lock->reader) { - /* The critical section started in qemu_co_rwlock_wrlock or - * qemu_co_rwlock_upgrade. - */ - qemu_co_queue_restart_all(&lock->wqueue); - qemu_co_queue_restart_all(&lock->rqueue); - } else { + if (lock->reader) { self->locks_held--; =20 + /* Read-side critical sections do not hold lock->mutex. */ qemu_co_mutex_lock(&lock->mutex); lock->reader--; assert(lock->reader >=3D 0); - /* If there are no remaining readers wake one waiting writer - * or all waiting readers. - */ - if (!lock->reader && !qemu_co_queue_next(&lock->wqueue)) { - qemu_co_queue_restart_all(&lock->rqueue); - } + } + + /* If there are no remaining readers wake one waiting writer or + * all waiting readers. + */ + if (!lock->reader && !qemu_co_queue_next(&lock->wqueue)) { + qemu_co_queue_restart_all(&lock->rqueue); } qemu_co_mutex_unlock(&lock->mutex); } --=20 2.30.1