Re: [PATCH 1/6] system/cpus: rename qemu_mutex_lock_iothread() to qemu_bql_lock()

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Hi Stefan,

On 11/30/23 02:56, Stefan Hajnoczi wrote:
The Big QEMU Lock (BQL) has many names and they are confusing. The
actual QemuMutex variable is called qemu_global_mutex but it's commonly
referred to as the BQL in discussions and some code comments. The
locking APIs, however, are called qemu_mutex_lock_iothread() and
qemu_mutex_unlock_iothread().

The "iothread" name is historic and comes from when the main thread was
split into into KVM vcpu threads and the "iothread" (now called the main
loop thread). I have contributed to the confusion myself by introducing
a separate --object iothread, a separate concept unrelated to the BQL.

The "iothread" name is no longer appropriate for the BQL. Rename the
locking APIs to:
- void qemu_bql_lock(void)
- void qemu_bql_unlock(void)
- bool qemu_bql_locked(void)

There are more APIs with "iothread" in their names. Subsequent patches
will rename them. There are also comments and documentation that will be
updated in later patches.

Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
---
  include/block/aio-wait.h             |   2 +-
  include/qemu/main-loop.h             |  26 +++---
  accel/accel-blocker.c                |  10 +--
  accel/dummy-cpus.c                   |   8 +-
  accel/hvf/hvf-accel-ops.c            |   4 +-
  accel/kvm/kvm-accel-ops.c            |   4 +-
  accel/kvm/kvm-all.c                  |  22 ++---
  accel/tcg/cpu-exec.c                 |  26 +++---
  accel/tcg/cputlb.c                   |  16 ++--
  accel/tcg/tcg-accel-ops-icount.c     |   4 +-
  accel/tcg/tcg-accel-ops-mttcg.c      |  12 +--
  accel/tcg/tcg-accel-ops-rr.c         |  14 ++--
  accel/tcg/tcg-accel-ops.c            |   2 +-
  accel/tcg/translate-all.c            |   2 +-
  cpu-common.c                         |   4 +-
  dump/dump.c                          |   4 +-
  hw/core/cpu-common.c                 |   6 +-
  hw/i386/intel_iommu.c                |   6 +-
  hw/i386/kvm/xen_evtchn.c             |  16 ++--
  hw/i386/kvm/xen_overlay.c            |   2 +-
  hw/i386/kvm/xen_xenstore.c           |   2 +-
  hw/intc/arm_gicv3_cpuif.c            |   2 +-
  hw/intc/s390_flic.c                  |  18 ++--
  hw/misc/edu.c                        |   4 +-
  hw/misc/imx6_src.c                   |   2 +-
  hw/misc/imx7_src.c                   |   2 +-
  hw/net/xen_nic.c                     |   8 +-
  hw/ppc/pegasos2.c                    |   2 +-
  hw/ppc/ppc.c                         |   4 +-
  hw/ppc/spapr.c                       |   2 +-
  hw/ppc/spapr_rng.c                   |   4 +-
  hw/ppc/spapr_softmmu.c               |   4 +-
  hw/remote/mpqemu-link.c              |  12 +--
  hw/remote/vfio-user-obj.c            |   2 +-
  hw/s390x/s390-skeys.c                |   2 +-
  migration/block-dirty-bitmap.c       |   4 +-
  migration/block.c                    |  16 ++--
  migration/colo.c                     |  60 +++++++-------
  migration/dirtyrate.c                |  12 +--
  migration/migration.c                |  52 ++++++------
  migration/ram.c                      |  12 +--
  replay/replay-internal.c             |   2 +-
  semihosting/console.c                |   8 +-
  stubs/iothread-lock.c                |   6 +-
  system/cpu-throttle.c                |   4 +-
  system/cpus.c                        |  28 +++----
  system/dirtylimit.c                  |   4 +-
  system/memory.c                      |   2 +-
  system/physmem.c                     |   8 +-
  system/runstate.c                    |   2 +-
  system/watchpoint.c                  |   4 +-
  target/arm/arm-powerctl.c            |  14 ++--
  target/arm/helper.c                  |   4 +-
  target/arm/hvf/hvf.c                 |   8 +-
  target/arm/kvm.c                     |   4 +-
  target/arm/kvm64.c                   |   4 +-
  target/arm/ptw.c                     |   6 +-
  target/arm/tcg/helper-a64.c          |   8 +-
  target/arm/tcg/m_helper.c            |   4 +-
  target/arm/tcg/op_helper.c           |  24 +++---
  target/arm/tcg/psci.c                |   2 +-
  target/hppa/int_helper.c             |   8 +-
  target/i386/hvf/hvf.c                |   6 +-
  target/i386/kvm/hyperv.c             |   4 +-
  target/i386/kvm/kvm.c                |  28 +++----
  target/i386/kvm/xen-emu.c            |  14 ++--
  target/i386/nvmm/nvmm-accel-ops.c    |   4 +-
  target/i386/nvmm/nvmm-all.c          |  20 ++---
  target/i386/tcg/sysemu/fpu_helper.c  |   6 +-
  target/i386/tcg/sysemu/misc_helper.c |   4 +-
  target/i386/whpx/whpx-accel-ops.c    |   4 +-
  target/i386/whpx/whpx-all.c          |  24 +++---
  target/loongarch/csr_helper.c        |   4 +-
  target/mips/kvm.c                    |   4 +-
  target/mips/tcg/sysemu/cp0_helper.c  |   4 +-
  target/openrisc/sys_helper.c         |  16 ++--
  target/ppc/excp_helper.c             |  12 +--
  target/ppc/kvm.c                     |   4 +-
  target/ppc/misc_helper.c             |   8 +-
  target/ppc/timebase_helper.c         |   8 +-
  target/s390x/kvm/kvm.c               |   4 +-
  target/s390x/tcg/misc_helper.c       | 118 +++++++++++++--------------
  target/sparc/int32_helper.c          |   2 +-
  target/sparc/int64_helper.c          |   6 +-
  target/sparc/win_helper.c            |  20 ++---
  target/xtensa/exc_helper.c           |   8 +-
  ui/spice-core.c                      |   4 +-
  util/async.c                         |   2 +-
  util/main-loop.c                     |   8 +-
  util/rcu.c                           |  14 ++--
  audio/coreaudio.m                    |   4 +-
  memory_ldst.c.inc                    |  18 ++--
  target/i386/hvf/README.md            |   2 +-
  ui/cocoa.m                           |  50 ++++++------
  94 files changed, 502 insertions(+), 502 deletions(-)



<snip>

diff --git a/hw/remote/mpqemu-link.c b/hw/remote/mpqemu-link.c
index 9bd98e8219..ffb2c25145 100644
--- a/hw/remote/mpqemu-link.c
+++ b/hw/remote/mpqemu-link.c
@@ -33,7 +33,7 @@
   */
  bool mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp)
  {
-    bool iolock = qemu_mutex_iothread_locked();
+    bool iolock = qemu_bql_locked();

Should var name (one more below) be updated to reflect this update ?

Otherwise,

Reviewed-by: Harsh Prateek Bora <harshpb@xxxxxxxxxxxxx>

      bool iothread = qemu_in_iothread();
      struct iovec send[2] = {};
      int *fds = NULL;
@@ -64,7 +64,7 @@ bool mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp)
       * Also skip lock handling while in a co-routine in the main context.
       */
      if (iolock && !iothread && !qemu_in_coroutine()) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
if (!qio_channel_writev_full_all(ioc, send, G_N_ELEMENTS(send),
@@ -76,7 +76,7 @@ bool mpqemu_msg_send(MPQemuMsg *msg, QIOChannel *ioc, Error **errp)
if (iolock && !iothread && !qemu_in_coroutine()) {
          /* See above comment why skip locking here. */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
return ret;
@@ -96,7 +96,7 @@ static ssize_t mpqemu_read(QIOChannel *ioc, void *buf, size_t len, int **fds,
                             size_t *nfds, Error **errp)
  {
      struct iovec iov = { .iov_base = buf, .iov_len = len };
-    bool iolock = qemu_mutex_iothread_locked();
+    bool iolock = qemu_bql_locked();
      bool iothread = qemu_in_iothread();
      int ret = -1;
@@ -107,13 +107,13 @@ static ssize_t mpqemu_read(QIOChannel *ioc, void *buf, size_t len, int **fds,
      assert(qemu_in_coroutine() || !iothread);
if (iolock && !iothread && !qemu_in_coroutine()) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
ret = qio_channel_readv_full_all_eof(ioc, &iov, 1, fds, nfds, errp); if (iolock && !iothread && !qemu_in_coroutine()) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
return (ret <= 0) ? ret : iov.iov_len;
diff --git a/hw/remote/vfio-user-obj.c b/hw/remote/vfio-user-obj.c
index 8b10c32a3c..d0d0386d52 100644
--- a/hw/remote/vfio-user-obj.c
+++ b/hw/remote/vfio-user-obj.c
@@ -400,7 +400,7 @@ static int vfu_object_mr_rw(MemoryRegion *mr, uint8_t *buf, hwaddr offset,
          }
if (release_lock) {
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              release_lock = false;
          }
diff --git a/hw/s390x/s390-skeys.c b/hw/s390x/s390-skeys.c
index 8f5159d85d..307344aa80 100644
--- a/hw/s390x/s390-skeys.c
+++ b/hw/s390x/s390-skeys.c
@@ -153,7 +153,7 @@ void qmp_dump_skeys(const char *filename, Error **errp)
          goto out;
      }
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
      guest_phys_blocks_init(&guest_phys_blocks);
      guest_phys_blocks_append(&guest_phys_blocks);
diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index 24347ab0f7..b5a2d377db 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -774,7 +774,7 @@ static void dirty_bitmap_state_pending(void *opaque,
      SaveBitmapState *dbms;
      uint64_t pending = 0;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
QSIMPLEQ_FOREACH(dbms, &s->dbms_list, entry) {
          uint64_t gran = bdrv_dirty_bitmap_granularity(dbms->bitmap);
@@ -784,7 +784,7 @@ static void dirty_bitmap_state_pending(void *opaque,
          pending += DIV_ROUND_UP(sectors * BDRV_SECTOR_SIZE, gran);
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
trace_dirty_bitmap_state_pending(pending); diff --git a/migration/block.c b/migration/block.c
index a15f9bddcb..87f36e6e35 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -269,7 +269,7 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
      int64_t count;
if (bmds->shared_base) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          aio_context_acquire(blk_get_aio_context(bb));
          /* Skip unallocated sectors; intentionally treats failure or
           * partial sector as an allocated sector */
@@ -282,7 +282,7 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
              cur_sector += count >> BDRV_SECTOR_BITS;
          }
          aio_context_release(blk_get_aio_context(bb));
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
if (cur_sector >= total_sectors) {
@@ -321,14 +321,14 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
       * This is ugly and will disappear when we make bdrv_* thread-safe,
       * without the need to acquire the AioContext.
       */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      aio_context_acquire(blk_get_aio_context(bmds->blk));
      bdrv_reset_dirty_bitmap(bmds->dirty_bitmap, cur_sector * BDRV_SECTOR_SIZE,
                              nr_sectors * BDRV_SECTOR_SIZE);
      blk->aiocb = blk_aio_preadv(bb, cur_sector * BDRV_SECTOR_SIZE, &blk->qiov,
                                  0, blk_mig_read_cb, blk);
      aio_context_release(blk_get_aio_context(bmds->blk));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
bmds->cur_sector = cur_sector + nr_sectors;
      return (bmds->cur_sector >= total_sectors);
@@ -786,9 +786,9 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
              /* Always called with iothread lock taken for
               * simplicity, block_save_complete also calls it.
               */
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              ret = blk_mig_save_dirty_block(f, 1);
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
          }
          if (ret < 0) {
              return ret;
@@ -860,9 +860,9 @@ static void block_state_pending(void *opaque, uint64_t *must_precopy,
      /* Estimate pending number of bytes to send */
      uint64_t pending;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      pending = get_remaining_dirty();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
blk_mig_lock();
      pending += block_mig_state.submitted * BLK_MIG_BLOCK_SIZE +
diff --git a/migration/colo.c b/migration/colo.c
index 4447e34914..2e68107cfa 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -420,13 +420,13 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
      qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
      bioc->usage = 0;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      if (failover_get_state() != FAILOVER_STATUS_NONE) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          goto out;
      }
      vm_stop_force_state(RUN_STATE_COLO);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      trace_colo_vm_state_change("run", "stop");
      /*
       * Failover request bh could be called after vm_stop_force_state(),
@@ -435,23 +435,23 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
      if (failover_get_state() != FAILOVER_STATUS_NONE) {
          goto out;
      }
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
replication_do_checkpoint_all(&local_err);
      if (local_err) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          goto out;
      }
colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
      if (local_err) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          goto out;
      }
      /* Note: device state is saved into buffer */
      ret = qemu_save_device_state(fb);
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      if (ret < 0) {
          goto out;
      }
@@ -504,9 +504,9 @@ static int colo_do_checkpoint_transaction(MigrationState *s,
ret = 0; - qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      vm_start();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      trace_colo_vm_state_change("stop", "run");
out:
@@ -557,15 +557,15 @@ static void colo_process_checkpoint(MigrationState *s)
      fb = qemu_file_new_output(QIO_CHANNEL(bioc));
      object_unref(OBJECT(bioc));
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
      if (local_err) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          goto out;
      }
vm_start();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      trace_colo_vm_state_change("stop", "run");
timer_mod(s->colo_delay_timer, qemu_clock_get_ms(QEMU_CLOCK_HOST) +
@@ -639,14 +639,14 @@ out:
void migrate_start_colo_process(MigrationState *s)
  {
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      qemu_event_init(&s->colo_checkpoint_event, false);
      s->colo_delay_timer =  timer_new_ms(QEMU_CLOCK_HOST,
                                  colo_checkpoint_notify, s);
qemu_sem_init(&s->colo_exit_sem, 0);
      colo_process_checkpoint(s);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
  }
static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
@@ -657,9 +657,9 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
      Error *local_err = NULL;
      int ret;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      vm_stop_force_state(RUN_STATE_COLO);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      trace_colo_vm_state_change("run", "stop");
/* FIXME: This is unnecessary for periodic checkpoint mode */
@@ -677,10 +677,10 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
          return;
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      cpu_synchronize_all_states();
      ret = qemu_loadvm_state_main(mis->from_src_file, mis);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (ret < 0) {
          error_setg(errp, "Load VM's live state (ram) error");
@@ -719,14 +719,14 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
          return;
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      vmstate_loading = true;
      colo_flush_ram_cache();
      ret = qemu_load_device_state(fb);
      if (ret < 0) {
          error_setg(errp, "COLO: load device state failed");
          vmstate_loading = false;
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return;
      }
@@ -734,7 +734,7 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
      if (local_err) {
          error_propagate(errp, local_err);
          vmstate_loading = false;
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return;
      }
@@ -743,7 +743,7 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
      if (local_err) {
          error_propagate(errp, local_err);
          vmstate_loading = false;
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return;
      }
      /* Notify all filters of all NIC to do checkpoint */
@@ -752,13 +752,13 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
      if (local_err) {
          error_propagate(errp, local_err);
          vmstate_loading = false;
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return;
      }
vmstate_loading = false;
      vm_start();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      trace_colo_vm_state_change("stop", "run");
if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
@@ -851,14 +851,14 @@ static void *colo_process_incoming_thread(void *opaque)
      fb = qemu_file_new_input(QIO_CHANNEL(bioc));
      object_unref(OBJECT(bioc));
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      replication_start_all(REPLICATION_MODE_SECONDARY, &local_err);
      if (local_err) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          goto out;
      }
      vm_start();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      trace_colo_vm_state_change("stop", "run");
colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
@@ -920,7 +920,7 @@ int coroutine_fn colo_incoming_co(void)
      Error *local_err = NULL;
      QemuThread th;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
if (!migration_incoming_colo_enabled()) {
          return 0;
@@ -940,10 +940,10 @@ int coroutine_fn colo_incoming_co(void)
      qemu_coroutine_yield();
      mis->colo_incoming_co = NULL;
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      /* Wait checkpoint incoming thread exit before free resource */
      qemu_thread_join(&th);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
/* We hold the global iothread lock, so it is safe here */
      colo_release_ram_cache();
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 036ac017fc..1d705092cd 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -90,13 +90,13 @@ static int64_t do_calculate_dirtyrate(DirtyPageRecord dirty_pages,
void global_dirty_log_change(unsigned int flag, bool start)
  {
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      if (start) {
          memory_global_dirty_log_start(flag);
      } else {
          memory_global_dirty_log_stop(flag);
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
/*
@@ -106,12 +106,12 @@ void global_dirty_log_change(unsigned int flag, bool start)
   */
  static void global_dirty_log_sync(unsigned int flag, bool one_shot)
  {
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      memory_global_dirty_log_sync(false);
      if (one_shot) {
          memory_global_dirty_log_stop(flag);
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
static DirtyPageRecord *vcpu_dirty_stat_alloc(VcpuStat *stat)
@@ -610,7 +610,7 @@ static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config)
      int64_t start_time;
      DirtyPageRecord dirty_pages;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE);
/*
@@ -627,7 +627,7 @@ static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config)
       * KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE cap is enabled.
       */
      dirtyrate_manual_reset_protect();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
record_dirtypages_bitmap(&dirty_pages, true); diff --git a/migration/migration.c b/migration/migration.c
index 28a34c9068..b153133fba 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1293,12 +1293,12 @@ static void migrate_fd_cleanup(MigrationState *s)
          QEMUFile *tmp;
trace_migrate_fd_cleanup();
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          if (s->migration_thread_running) {
              qemu_thread_join(&s->thread);
              s->migration_thread_running = false;
          }
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
multifd_save_cleanup();
          qemu_mutex_lock(&s->qemu_file_lock);
@@ -2410,7 +2410,7 @@ static int postcopy_start(MigrationState *ms, Error **errp)
      }
trace_postcopy_start();
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      trace_postcopy_start_set_run();
migration_downtime_start(ms);
@@ -2519,7 +2519,7 @@ static int postcopy_start(MigrationState *ms, Error **errp)
migration_downtime_end(ms); - qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (migrate_postcopy_ram()) {
          /*
@@ -2560,7 +2560,7 @@ fail:
              error_report_err(local_err);
          }
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      return -1;
  }
@@ -2594,14 +2594,14 @@ static int migration_maybe_pause(MigrationState *s,
       * wait for the 'pause_sem' semaphore.
       */
      if (s->state != MIGRATION_STATUS_CANCELLING) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          migrate_set_state(&s->state, *current_active_state,
                            MIGRATION_STATUS_PRE_SWITCHOVER);
          qemu_sem_wait(&s->pause_sem);
          migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
                            new_state);
          *current_active_state = new_state;
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
return s->state == new_state ? 0 : -EINVAL;
@@ -2612,7 +2612,7 @@ static int migration_completion_precopy(MigrationState *s,
  {
      int ret;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      migration_downtime_start(s);
      qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
@@ -2640,7 +2640,7 @@ static int migration_completion_precopy(MigrationState *s,
      ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
                                               s->block_inactive);
  out_unlock:
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      return ret;
  }
@@ -2648,9 +2648,9 @@ static void migration_completion_postcopy(MigrationState *s)
  {
      trace_migration_completion_postcopy_end();
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_savevm_state_complete_postcopy(s->to_dst_file);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
/*
       * Shutdown the postcopy fast path thread.  This is only needed when dest
@@ -2674,14 +2674,14 @@ static void migration_completion_failed(MigrationState *s,
           */
          Error *local_err = NULL;
- qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          bdrv_activate_all(&local_err);
          if (local_err) {
              error_report_err(local_err);
          } else {
              s->block_inactive = false;
          }
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
migrate_set_state(&s->state, current_active_state,
@@ -3121,7 +3121,7 @@ static void migration_iteration_finish(MigrationState *s)
      /* If we enabled cpu throttling for auto-converge, turn it off. */
      cpu_throttle_stop();
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      switch (s->state) {
      case MIGRATION_STATUS_COMPLETED:
          migration_calculate_complete(s);
@@ -3152,7 +3152,7 @@ static void migration_iteration_finish(MigrationState *s)
          break;
      }
      migrate_fd_cleanup_schedule(s);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
static void bg_migration_iteration_finish(MigrationState *s)
@@ -3164,7 +3164,7 @@ static void bg_migration_iteration_finish(MigrationState *s)
       */
      ram_write_tracking_stop();
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      switch (s->state) {
      case MIGRATION_STATUS_COMPLETED:
          migration_calculate_complete(s);
@@ -3183,7 +3183,7 @@ static void bg_migration_iteration_finish(MigrationState *s)
      }
migrate_fd_cleanup_schedule(s);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
/*
@@ -3305,9 +3305,9 @@ static void *migration_thread(void *opaque)
      object_ref(OBJECT(s));
      update_iteration_initial_status(s);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_savevm_state_header(s->to_dst_file);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
/*
       * If we opened the return path, we need to make sure dst has it
@@ -3335,9 +3335,9 @@ static void *migration_thread(void *opaque)
          qemu_savevm_send_colo_enable(s->to_dst_file);
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_savevm_state_setup(s->to_dst_file);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP,
                                 MIGRATION_STATUS_ACTIVE);
@@ -3448,10 +3448,10 @@ static void *bg_migration_thread(void *opaque)
      ram_write_tracking_prepare();
  #endif
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_savevm_state_header(s->to_dst_file);
      qemu_savevm_state_setup(s->to_dst_file);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP,
                                 MIGRATION_STATUS_ACTIVE);
@@ -3461,7 +3461,7 @@ static void *bg_migration_thread(void *opaque)
      trace_migration_thread_setup_complete();
      migration_downtime_start(s);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
/*
       * If VM is currently in suspended state, then, to make a valid runstate
@@ -3504,7 +3504,7 @@ static void *bg_migration_thread(void *opaque)
      s->vm_start_bh = qemu_bh_new(bg_migration_vm_start_bh, s);
      qemu_bh_schedule(s->vm_start_bh);
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
while (migration_is_active(s)) {
          MigIterateState iter_state = bg_migration_iteration_run(s);
@@ -3533,7 +3533,7 @@ fail:
      if (early_fail) {
          migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
                  MIGRATION_STATUS_FAILED);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
bg_migration_iteration_finish(s);
diff --git a/migration/ram.c b/migration/ram.c
index 8c7886ab79..f274bcf655 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2984,9 +2984,9 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
      migration_ops = g_malloc0(sizeof(MigrationOps));
      migration_ops->ram_save_target_page = ram_save_target_page_legacy;
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      ret = multifd_send_sync_main(f);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      if (ret < 0) {
          return ret;
      }
@@ -3221,11 +3221,11 @@ static void ram_state_pending_exact(void *opaque, uint64_t *must_precopy,
      uint64_t remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE;
if (!migration_in_postcopy() && remaining_size < s->threshold_size) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          WITH_RCU_READ_LOCK_GUARD() {
              migration_bitmap_sync_precopy(rs, false);
          }
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          remaining_size = rs->migration_dirty_pages * TARGET_PAGE_SIZE;
      }
@@ -3453,7 +3453,7 @@ void colo_incoming_start_dirty_log(void)
  {
      RAMBlock *block = NULL;
      /* For memory_global_dirty_log_start below. */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_mutex_lock_ramlist();
memory_global_dirty_log_sync(false);
@@ -3467,7 +3467,7 @@ void colo_incoming_start_dirty_log(void)
      }
      ram_state->migration_dirty_pages = 0;
      qemu_mutex_unlock_ramlist();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
/* It is need to hold the global lock to call this helper */
diff --git a/replay/replay-internal.c b/replay/replay-internal.c
index 77d0c82327..04c9c6374b 100644
--- a/replay/replay-internal.c
+++ b/replay/replay-internal.c
@@ -216,7 +216,7 @@ void replay_mutex_lock(void)
  {
      if (replay_mode != REPLAY_MODE_NONE) {
          unsigned long id;
-        g_assert(!qemu_mutex_iothread_locked());
+        g_assert(!qemu_bql_locked());
          g_assert(!replay_mutex_locked());
          qemu_mutex_lock(&lock);
          id = mutex_tail++;
diff --git a/semihosting/console.c b/semihosting/console.c
index 5d61e8207e..666285541d 100644
--- a/semihosting/console.c
+++ b/semihosting/console.c
@@ -43,7 +43,7 @@ static SemihostingConsole console;
  static int console_can_read(void *opaque)
  {
      SemihostingConsole *c = opaque;
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
      return (int)fifo8_num_free(&c->fifo);
  }
@@ -58,7 +58,7 @@ static void console_wake_up(gpointer data, gpointer user_data)
  static void console_read(void *opaque, const uint8_t *buf, int size)
  {
      SemihostingConsole *c = opaque;
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
      while (size-- && !fifo8_is_full(&c->fifo)) {
          fifo8_push(&c->fifo, *buf++);
      }
@@ -70,7 +70,7 @@ bool qemu_semihosting_console_ready(void)
  {
      SemihostingConsole *c = &console;
- g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
      return !fifo8_is_empty(&c->fifo);
  }
@@ -78,7 +78,7 @@ void qemu_semihosting_console_block_until_ready(CPUState *cs)
  {
      SemihostingConsole *c = &console;
- g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
/* Block if the fifo is completely empty. */
      if (fifo8_is_empty(&c->fifo)) {
diff --git a/stubs/iothread-lock.c b/stubs/iothread-lock.c
index 5b45b7fc8b..1f24c3203a 100644
--- a/stubs/iothread-lock.c
+++ b/stubs/iothread-lock.c
@@ -1,15 +1,15 @@
  #include "qemu/osdep.h"
  #include "qemu/main-loop.h"
-bool qemu_mutex_iothread_locked(void)
+bool qemu_bql_locked(void)
  {
      return false;
  }
-void qemu_mutex_lock_iothread_impl(const char *file, int line)
+void qemu_bql_lock_impl(const char *file, int line)
  {
  }
-void qemu_mutex_unlock_iothread(void)
+void qemu_bql_unlock(void)
  {
  }
diff --git a/system/cpu-throttle.c b/system/cpu-throttle.c
index d9bb30a223..e98836311b 100644
--- a/system/cpu-throttle.c
+++ b/system/cpu-throttle.c
@@ -57,9 +57,9 @@ static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque)
              qemu_cond_timedwait_iothread(cpu->halt_cond,
                                           sleeptime_ns / SCALE_MS);
          } else {
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              g_usleep(sleeptime_ns / SCALE_US);
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
          }
          sleeptime_ns = endtime_ns - qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
      }
diff --git a/system/cpus.c b/system/cpus.c
index a444a747f0..d5b98c11f5 100644
--- a/system/cpus.c
+++ b/system/cpus.c
@@ -481,35 +481,35 @@ bool qemu_in_vcpu_thread(void)
      return current_cpu && qemu_cpu_is_self(current_cpu);
  }
-QEMU_DEFINE_STATIC_CO_TLS(bool, iothread_locked)
+QEMU_DEFINE_STATIC_CO_TLS(bool, bql_locked)
-bool qemu_mutex_iothread_locked(void)
+bool qemu_bql_locked(void)
  {
-    return get_iothread_locked();
+    return get_bql_locked();
  }
bool qemu_in_main_thread(void)
  {
-    return qemu_mutex_iothread_locked();
+    return qemu_bql_locked();
  }
/*
   * The BQL is taken from so many places that it is worth profiling the
   * callers directly, instead of funneling them all through a single function.
   */
-void qemu_mutex_lock_iothread_impl(const char *file, int line)
+void qemu_bql_lock_impl(const char *file, int line)
  {
      QemuMutexLockFunc bql_lock = qatomic_read(&qemu_bql_mutex_lock_func);
- g_assert(!qemu_mutex_iothread_locked());
+    g_assert(!qemu_bql_locked());
      bql_lock(&qemu_global_mutex, file, line);
-    set_iothread_locked(true);
+    set_bql_locked(true);
  }
-void qemu_mutex_unlock_iothread(void)
+void qemu_bql_unlock(void)
  {
-    g_assert(qemu_mutex_iothread_locked());
-    set_iothread_locked(false);
+    g_assert(qemu_bql_locked());
+    set_bql_locked(false);
      qemu_mutex_unlock(&qemu_global_mutex);
  }
@@ -577,9 +577,9 @@ void pause_all_vcpus(void)
          }
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      replay_mutex_lock();
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
  }
void cpu_resume(CPUState *cpu)
@@ -608,9 +608,9 @@ void cpu_remove_sync(CPUState *cpu)
      cpu->stop = true;
      cpu->unplug = true;
      qemu_cpu_kick(cpu);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      qemu_thread_join(cpu->thread);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
  }
void cpus_register_accel(const AccelOpsClass *ops)
diff --git a/system/dirtylimit.c b/system/dirtylimit.c
index 495c7a7082..f89bf6b61f 100644
--- a/system/dirtylimit.c
+++ b/system/dirtylimit.c
@@ -148,9 +148,9 @@ void vcpu_dirty_rate_stat_stop(void)
  {
      qatomic_set(&vcpu_dirty_rate_stat->running, 0);
      dirtylimit_state_unlock();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      qemu_thread_join(&vcpu_dirty_rate_stat->thread);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      dirtylimit_state_lock();
  }
diff --git a/system/memory.c b/system/memory.c
index 4d9cb0a7ff..8d78334cb2 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -1119,7 +1119,7 @@ void memory_region_transaction_commit(void)
      AddressSpace *as;
assert(memory_region_transaction_depth);
-    assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
--memory_region_transaction_depth;
      if (!memory_region_transaction_depth) {
diff --git a/system/physmem.c b/system/physmem.c
index a63853a7bc..c136675876 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -2639,8 +2639,8 @@ bool prepare_mmio_access(MemoryRegion *mr)
  {
      bool release_lock = false;
- if (!qemu_mutex_iothread_locked()) {
-        qemu_mutex_lock_iothread();
+    if (!qemu_bql_locked()) {
+        qemu_bql_lock();
          release_lock = true;
      }
      if (mr->flush_coalesced_mmio) {
@@ -2721,7 +2721,7 @@ static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
          }
if (release_lock) {
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              release_lock = false;
          }
@@ -2799,7 +2799,7 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
          }
if (release_lock) {
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              release_lock = false;
          }
diff --git a/system/runstate.c b/system/runstate.c
index ea9d6c2a32..5718e6827c 100644
--- a/system/runstate.c
+++ b/system/runstate.c
@@ -810,7 +810,7 @@ void qemu_init_subsystems(void)
qemu_init_cpu_list();
      qemu_init_cpu_loop();
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
atexit(qemu_run_exit_notifiers); diff --git a/system/watchpoint.c b/system/watchpoint.c
index ba5ad13352..d9cc71dd33 100644
--- a/system/watchpoint.c
+++ b/system/watchpoint.c
@@ -155,9 +155,9 @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
           * Now raise the debug interrupt so that it will
           * trigger after the current instruction.
           */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_interrupt(cpu, CPU_INTERRUPT_DEBUG);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return;
      }
diff --git a/target/arm/arm-powerctl.c b/target/arm/arm-powerctl.c
index c078849403..aec104834d 100644
--- a/target/arm/arm-powerctl.c
+++ b/target/arm/arm-powerctl.c
@@ -88,7 +88,7 @@ static void arm_set_cpu_on_async_work(CPUState *target_cpu_state,
      g_free(info);
/* Finally set the power status */
-    assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
      target_cpu->power_state = PSCI_ON;
  }
@@ -99,7 +99,7 @@ int arm_set_cpu_on(uint64_t cpuid, uint64_t entry, uint64_t context_id,
      ARMCPU *target_cpu;
      struct CpuOnInfo *info;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
DPRINTF("cpu %" PRId64 " (EL %d, %s) @ 0x%" PRIx64 " with R0 = 0x%" PRIx64
              "\n", cpuid, target_el, target_aa64 ? "aarch64" : "aarch32", entry,
@@ -196,7 +196,7 @@ static void arm_set_cpu_on_and_reset_async_work(CPUState *target_cpu_state,
      target_cpu_state->halted = 0;
/* Finally set the power status */
-    assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
      target_cpu->power_state = PSCI_ON;
  }
@@ -205,7 +205,7 @@ int arm_set_cpu_on_and_reset(uint64_t cpuid)
      CPUState *target_cpu_state;
      ARMCPU *target_cpu;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
/* Retrieve the cpu we are powering up */
      target_cpu_state = arm_get_cpu_by_id(cpuid);
@@ -247,7 +247,7 @@ static void arm_set_cpu_off_async_work(CPUState *target_cpu_state,
  {
      ARMCPU *target_cpu = ARM_CPU(target_cpu_state);
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
      target_cpu->power_state = PSCI_OFF;
      target_cpu_state->halted = 1;
      target_cpu_state->exception_index = EXCP_HLT;
@@ -258,7 +258,7 @@ int arm_set_cpu_off(uint64_t cpuid)
      CPUState *target_cpu_state;
      ARMCPU *target_cpu;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
DPRINTF("cpu %" PRId64 "\n", cpuid); @@ -294,7 +294,7 @@ int arm_reset_cpu(uint64_t cpuid)
      CPUState *target_cpu_state;
      ARMCPU *target_cpu;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
DPRINTF("cpu %" PRId64 "\n", cpuid); diff --git a/target/arm/helper.c b/target/arm/helper.c
index 2746d3fdac..f472043986 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -5831,7 +5831,7 @@ static void do_hcr_write(CPUARMState *env, uint64_t value, uint64_t valid_mask)
       * VFIQ are masked unless running at EL0 or EL1, and HCR
       * can only be written at EL2.
       */
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
      arm_cpu_update_virq(cpu);
      arm_cpu_update_vfiq(cpu);
      arm_cpu_update_vserr(cpu);
@@ -11344,7 +11344,7 @@ void arm_cpu_do_interrupt(CPUState *cs)
       * BQL needs to be held for any modification of
       * cs->interrupt_request.
       */
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
arm_call_pre_el_change_hook(cpu); diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 757e13b0f9..017fd13c5d 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1718,9 +1718,9 @@ static void hvf_wait_for_ipi(CPUState *cpu, struct timespec *ts)
       * sleeping.
       */
      qatomic_set_mb(&cpu->thread_kicked, false);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      pselect(0, 0, 0, 0, ts, &cpu->accel->unblock_ipi_mask);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
  }
static void hvf_wfi(CPUState *cpu)
@@ -1821,7 +1821,7 @@ int hvf_vcpu_exec(CPUState *cpu)
flush_cpu_state(cpu); - qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      assert_hvf_ok(hv_vcpu_run(cpu->accel->fd));
/* handle VMEXIT */
@@ -1830,7 +1830,7 @@ int hvf_vcpu_exec(CPUState *cpu)
      uint32_t ec = syn_get_ec(syndrome);
ret = 0;
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      switch (exit_reason) {
      case HV_EXIT_REASON_EXCEPTION:
          /* This is the main one, handle below. */
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 7903e2ddde..431b82e509 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -833,7 +833,7 @@ MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
      if (run->s.regs.device_irq_level != cpu->device_irq_level) {
          switched_level = cpu->device_irq_level ^ run->s.regs.device_irq_level;
- qemu_mutex_lock_iothread();
+        qemu_bql_lock();
if (switched_level & KVM_ARM_DEV_EL1_VTIMER) {
              qemu_set_irq(cpu->gt_timer_outputs[GTIMER_VIRT],
@@ -862,7 +862,7 @@ MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
/* We also mark unknown levels as processed to not waste cycles */
          cpu->device_irq_level = run->s.regs.device_irq_level;
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
return MEMTXATTRS_UNSPECIFIED;
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index 3c175c93a7..282dc5920e 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -1233,9 +1233,9 @@ bool kvm_arm_handle_debug(CPUState *cs, struct kvm_debug_exit_arch *debug_exit)
      env->exception.syndrome = debug_exit->hsr;
      env->exception.vaddress = debug_exit->far;
      env->exception.target_el = 1;
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      arm_cpu_do_interrupt(cs);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
return false;
  }
diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 1762b058ae..e3cc0a7ab8 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -772,9 +772,9 @@ static uint64_t arm_casq_ptw(CPUARMState *env, uint64_t old_val,
  #if !TCG_OVERSIZED_GUEST
  # error "Unexpected configuration"
  #endif
-    bool locked = qemu_mutex_iothread_locked();
+    bool locked = qemu_bql_locked();
      if (!locked) {
-       qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
      if (ptw->out_be) {
          cur_val = ldq_be_p(host);
@@ -788,7 +788,7 @@ static uint64_t arm_casq_ptw(CPUARMState *env, uint64_t old_val,
          }
      }
      if (!locked) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  #endif
diff --git a/target/arm/tcg/helper-a64.c b/target/arm/tcg/helper-a64.c
index 8ad84623d3..22d453e6e0 100644
--- a/target/arm/tcg/helper-a64.c
+++ b/target/arm/tcg/helper-a64.c
@@ -809,9 +809,9 @@ void HELPER(exception_return)(CPUARMState *env, uint64_t new_pc)
          goto illegal_return;
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      arm_call_pre_el_change_hook(env_archcpu(env));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (!return_to_aa64) {
          env->aarch64 = false;
@@ -876,9 +876,9 @@ void HELPER(exception_return)(CPUARMState *env, uint64_t new_pc)
       */
      aarch64_sve_change_el(env, cur_el, new_el, return_to_aa64);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      arm_call_el_change_hook(env_archcpu(env));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
return; diff --git a/target/arm/tcg/m_helper.c b/target/arm/tcg/m_helper.c
index a26adb75aa..5f38b9a4a1 100644
--- a/target/arm/tcg/m_helper.c
+++ b/target/arm/tcg/m_helper.c
@@ -374,7 +374,7 @@ void HELPER(v7m_preserve_fp_state)(CPUARMState *env)
      bool take_exception;
/* Take the iothread lock as we are going to touch the NVIC */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
/* Check the background context had access to the FPU */
      if (!v7m_cpacr_pass(env, is_secure, is_priv)) {
@@ -428,7 +428,7 @@ void HELPER(v7m_preserve_fp_state)(CPUARMState *env)
      take_exception = !stacked_ok &&
          armv7m_nvic_can_take_pending_exception(env->nvic);
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (take_exception) {
          raise_exception_ra(env, EXCP_LAZYFP, 0, 1, GETPC());
diff --git a/target/arm/tcg/op_helper.c b/target/arm/tcg/op_helper.c
index ea08936a85..46a14aac52 100644
--- a/target/arm/tcg/op_helper.c
+++ b/target/arm/tcg/op_helper.c
@@ -427,9 +427,9 @@ void HELPER(cpsr_write_eret)(CPUARMState *env, uint32_t val)
  {
      uint32_t mask;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      arm_call_pre_el_change_hook(env_archcpu(env));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
mask = aarch32_cpsr_valid_mask(env->features, &env_archcpu(env)->isar);
      cpsr_write(env, val, mask, CPSRWriteExceptionReturn);
@@ -442,9 +442,9 @@ void HELPER(cpsr_write_eret)(CPUARMState *env, uint32_t val)
      env->regs[15] &= (env->thumb ? ~1 : ~3);
      arm_rebuild_hflags(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      arm_call_el_change_hook(env_archcpu(env));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
/* Access to user mode registers from privileged modes. */
@@ -803,9 +803,9 @@ void HELPER(set_cp_reg)(CPUARMState *env, const void *rip, uint32_t value)
      const ARMCPRegInfo *ri = rip;
if (ri->type & ARM_CP_IO) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ri->writefn(env, ri, value);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      } else {
          ri->writefn(env, ri, value);
      }
@@ -817,9 +817,9 @@ uint32_t HELPER(get_cp_reg)(CPUARMState *env, const void *rip)
      uint32_t res;
if (ri->type & ARM_CP_IO) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          res = ri->readfn(env, ri);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      } else {
          res = ri->readfn(env, ri);
      }
@@ -832,9 +832,9 @@ void HELPER(set_cp_reg64)(CPUARMState *env, const void *rip, uint64_t value)
      const ARMCPRegInfo *ri = rip;
if (ri->type & ARM_CP_IO) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ri->writefn(env, ri, value);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      } else {
          ri->writefn(env, ri, value);
      }
@@ -846,9 +846,9 @@ uint64_t HELPER(get_cp_reg64)(CPUARMState *env, const void *rip)
      uint64_t res;
if (ri->type & ARM_CP_IO) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          res = ri->readfn(env, ri);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      } else {
          res = ri->readfn(env, ri);
      }
diff --git a/target/arm/tcg/psci.c b/target/arm/tcg/psci.c
index 6c1239bb96..51af10db99 100644
--- a/target/arm/tcg/psci.c
+++ b/target/arm/tcg/psci.c
@@ -107,7 +107,7 @@ void arm_handle_psci_call(ARMCPU *cpu)
              }
              target_cpu = ARM_CPU(target_cpu_state);
- g_assert(qemu_mutex_iothread_locked());
+            g_assert(qemu_bql_locked());
              ret = target_cpu->power_state;
              break;
          default:
diff --git a/target/hppa/int_helper.c b/target/hppa/int_helper.c
index 98e9d688f6..9ef8cf7ff4 100644
--- a/target/hppa/int_helper.c
+++ b/target/hppa/int_helper.c
@@ -84,17 +84,17 @@ void hppa_cpu_alarm_timer(void *opaque)
  void HELPER(write_eirr)(CPUHPPAState *env, target_ulong val)
  {
      env->cr[CR_EIRR] &= ~val;
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      eval_interrupt(env_archcpu(env));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(write_eiem)(CPUHPPAState *env, target_ulong val)
  {
      env->cr[CR_EIEM] = val;
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      eval_interrupt(env_archcpu(env));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void hppa_cpu_do_interrupt(CPUState *cs)
diff --git a/target/i386/hvf/hvf.c b/target/i386/hvf/hvf.c
index 20b9ca3ef5..2cc8b115f7 100644
--- a/target/i386/hvf/hvf.c
+++ b/target/i386/hvf/hvf.c
@@ -429,9 +429,9 @@ int hvf_vcpu_exec(CPUState *cpu)
          }
          vmx_update_tpr(cpu);
- qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          if (!cpu_is_bsp(X86_CPU(cpu)) && cpu->halted) {
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              return EXCP_HLT;
          }
@@ -450,7 +450,7 @@ int hvf_vcpu_exec(CPUState *cpu)
          rip = rreg(cpu->accel->fd, HV_X86_RIP);
          env->eflags = rreg(cpu->accel->fd, HV_X86_RFLAGS);
- qemu_mutex_lock_iothread();
+        qemu_bql_lock();
update_apic_tpr(cpu);
          current_cpu = cpu;
diff --git a/target/i386/kvm/hyperv.c b/target/i386/kvm/hyperv.c
index e3ac978648..dcad09f6c9 100644
--- a/target/i386/kvm/hyperv.c
+++ b/target/i386/kvm/hyperv.c
@@ -45,9 +45,9 @@ void hyperv_x86_synic_update(X86CPU *cpu)
static void async_synic_update(CPUState *cs, run_on_cpu_data data)
  {
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      hyperv_x86_synic_update(X86_CPU(cs));
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 11b8177eff..084f5e6b8b 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -4705,9 +4705,9 @@ void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
      /* Inject NMI */
      if (cpu->interrupt_request & (CPU_INTERRUPT_NMI | CPU_INTERRUPT_SMI)) {
          if (cpu->interrupt_request & CPU_INTERRUPT_NMI) {
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              cpu->interrupt_request &= ~CPU_INTERRUPT_NMI;
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              DPRINTF("injected NMI\n");
              ret = kvm_vcpu_ioctl(cpu, KVM_NMI);
              if (ret < 0) {
@@ -4716,9 +4716,9 @@ void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
              }
          }
          if (cpu->interrupt_request & CPU_INTERRUPT_SMI) {
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              cpu->interrupt_request &= ~CPU_INTERRUPT_SMI;
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              DPRINTF("injected SMI\n");
              ret = kvm_vcpu_ioctl(cpu, KVM_SMI);
              if (ret < 0) {
@@ -4729,7 +4729,7 @@ void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
      }
if (!kvm_pic_in_kernel()) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
/* Force the VCPU out of its inner loop to process any INIT requests
@@ -4782,7 +4782,7 @@ void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
          DPRINTF("setting tpr\n");
          run->cr8 = cpu_get_apic_tpr(x86_cpu->apic_state);
- qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  }
@@ -4830,12 +4830,12 @@ MemTxAttrs kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
      /* We need to protect the apic state against concurrent accesses from
       * different threads in case the userspace irqchip is used. */
      if (!kvm_irqchip_in_kernel()) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
      cpu_set_apic_tpr(x86_cpu->apic_state, run->cr8);
      cpu_set_apic_base(x86_cpu->apic_state, run->apic_base);
      if (!kvm_irqchip_in_kernel()) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      return cpu_get_mem_attrs(env);
  }
@@ -5269,17 +5269,17 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
      switch (run->exit_reason) {
      case KVM_EXIT_HLT:
          DPRINTF("handle_hlt\n");
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ret = kvm_handle_halt(cpu);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
      case KVM_EXIT_SET_TPR:
          ret = 0;
          break;
      case KVM_EXIT_TPR_ACCESS:
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ret = kvm_handle_tpr_access(cpu);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
      case KVM_EXIT_FAIL_ENTRY:
          code = run->fail_entry.hardware_entry_failure_reason;
@@ -5305,9 +5305,9 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
          break;
      case KVM_EXIT_DEBUG:
          DPRINTF("kvm_exit_debug\n");
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ret = kvm_handle_debug(cpu, &run->debug.arch);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
      case KVM_EXIT_HYPERV:
          ret = kvm_hv_handle_exit(cpu, &run->hyperv);
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index c0631f9cf4..f79f5d270f 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -403,7 +403,7 @@ void kvm_xen_maybe_deassert_callback(CPUState *cs)
/* If the evtchn_upcall_pending flag is cleared, turn the GSI off. */
      if (!vi->evtchn_upcall_pending) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          /*
           * Check again now we have the lock, because it may have been
           * asserted in the interim. And we don't want to take the lock
@@ -413,7 +413,7 @@ void kvm_xen_maybe_deassert_callback(CPUState *cs)
              X86_CPU(cs)->env.xen_callback_asserted = false;
              xen_evtchn_set_callback_level(0);
          }
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  }
@@ -773,9 +773,9 @@ static bool handle_set_param(struct kvm_xen_exit *exit, X86CPU *cpu, switch (hp.index) {
      case HVM_PARAM_CALLBACK_IRQ:
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          err = xen_evtchn_set_callback_param(hp.value);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          xen_set_long_mode(exit->u.hcall.longmode);
          break;
      default:
@@ -1408,7 +1408,7 @@ int kvm_xen_soft_reset(void)
      CPUState *cpu;
      int err;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
trace_kvm_xen_soft_reset(); @@ -1481,9 +1481,9 @@ static int schedop_shutdown(CPUState *cs, uint64_t arg)
          break;
case SHUTDOWN_soft_reset:
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ret = kvm_xen_soft_reset();
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
default:
diff --git a/target/i386/nvmm/nvmm-accel-ops.c b/target/i386/nvmm/nvmm-accel-ops.c
index 6c46101ac1..387ccfcce5 100644
--- a/target/i386/nvmm/nvmm-accel-ops.c
+++ b/target/i386/nvmm/nvmm-accel-ops.c
@@ -25,7 +25,7 @@ static void *qemu_nvmm_cpu_thread_fn(void *arg)
rcu_register_thread(); - qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_thread_get_self(cpu->thread);
      cpu->thread_id = qemu_get_thread_id();
      current_cpu = cpu;
@@ -55,7 +55,7 @@ static void *qemu_nvmm_cpu_thread_fn(void *arg)
nvmm_destroy_vcpu(cpu);
      cpu_thread_signal_destroyed(cpu);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      rcu_unregister_thread();
      return NULL;
  }
diff --git a/target/i386/nvmm/nvmm-all.c b/target/i386/nvmm/nvmm-all.c
index 7d752bc5e0..9fa5b2e34a 100644
--- a/target/i386/nvmm/nvmm-all.c
+++ b/target/i386/nvmm/nvmm-all.c
@@ -399,7 +399,7 @@ nvmm_vcpu_pre_run(CPUState *cpu)
      uint8_t tpr;
      int ret;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
tpr = cpu_get_apic_tpr(x86_cpu->apic_state);
      if (tpr != qcpu->tpr) {
@@ -462,7 +462,7 @@ nvmm_vcpu_pre_run(CPUState *cpu)
          }
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
/*
@@ -485,9 +485,9 @@ nvmm_vcpu_post_run(CPUState *cpu, struct nvmm_vcpu_exit *exit)
      tpr = exit->exitstate.cr8;
      if (qcpu->tpr != tpr) {
          qcpu->tpr = tpr;
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_set_apic_tpr(x86_cpu->apic_state, qcpu->tpr);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  }
@@ -648,7 +648,7 @@ nvmm_handle_halted(struct nvmm_machine *mach, CPUState *cpu,
      CPUX86State *env = cpu_env(cpu);
      int ret = 0;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
if (!((cpu->interrupt_request & CPU_INTERRUPT_HARD) &&
            (env->eflags & IF_MASK)) &&
@@ -658,7 +658,7 @@ nvmm_handle_halted(struct nvmm_machine *mach, CPUState *cpu,
          ret = 1;
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
return ret;
  }
@@ -721,7 +721,7 @@ nvmm_vcpu_loop(CPUState *cpu)
          return 0;
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      cpu_exec_start(cpu);
/*
@@ -806,16 +806,16 @@ nvmm_vcpu_loop(CPUState *cpu)
              error_report("NVMM: Unexpected VM exit code 0x%lx [hw=0x%lx]",
                  exit->reason, exit->u.inv.hwcode);
              nvmm_get_registers(cpu);
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              qemu_system_guest_panicked(cpu_get_crash_info(cpu));
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              ret = -1;
              break;
          }
      } while (ret == 0);
cpu_exec_end(cpu);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
qatomic_set(&cpu->exit_request, false); diff --git a/target/i386/tcg/sysemu/fpu_helper.c b/target/i386/tcg/sysemu/fpu_helper.c
index 93506cdd94..4960e97ebc 100644
--- a/target/i386/tcg/sysemu/fpu_helper.c
+++ b/target/i386/tcg/sysemu/fpu_helper.c
@@ -32,9 +32,9 @@ void x86_register_ferr_irq(qemu_irq irq)
  void fpu_check_raise_ferr_irq(CPUX86State *env)
  {
      if (ferr_irq && !(env->hflags2 & HF2_IGNNE_MASK)) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          qemu_irq_raise(ferr_irq);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return;
      }
  }
@@ -49,7 +49,7 @@ void cpu_set_ignne(void)
  {
      CPUX86State *env = &X86_CPU(first_cpu)->env;
- assert(qemu_mutex_iothread_locked());
+    assert(qemu_bql_locked());
env->hflags2 |= HF2_IGNNE_MASK;
      /*
diff --git a/target/i386/tcg/sysemu/misc_helper.c b/target/i386/tcg/sysemu/misc_helper.c
index e1528b7f80..e859879f4f 100644
--- a/target/i386/tcg/sysemu/misc_helper.c
+++ b/target/i386/tcg/sysemu/misc_helper.c
@@ -118,9 +118,9 @@ void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
          break;
      case 8:
          if (!(env->hflags2 & HF2_VINTR_MASK)) {
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              cpu_set_apic_tpr(env_archcpu(env)->apic_state, t0);
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
          }
          env->int_ctl = (env->int_ctl & ~V_TPR_MASK) | (t0 & V_TPR_MASK);
diff --git a/target/i386/whpx/whpx-accel-ops.c b/target/i386/whpx/whpx-accel-ops.c
index 67cad86720..1f29346a88 100644
--- a/target/i386/whpx/whpx-accel-ops.c
+++ b/target/i386/whpx/whpx-accel-ops.c
@@ -25,7 +25,7 @@ static void *whpx_cpu_thread_fn(void *arg)
rcu_register_thread(); - qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      qemu_thread_get_self(cpu->thread);
      cpu->thread_id = qemu_get_thread_id();
      current_cpu = cpu;
@@ -55,7 +55,7 @@ static void *whpx_cpu_thread_fn(void *arg)
whpx_destroy_vcpu(cpu);
      cpu_thread_signal_destroyed(cpu);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      rcu_unregister_thread();
      return NULL;
  }
diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c
index d29ba916a0..50057b22ee 100644
--- a/target/i386/whpx/whpx-all.c
+++ b/target/i386/whpx/whpx-all.c
@@ -1324,7 +1324,7 @@ static int whpx_first_vcpu_starting(CPUState *cpu)
      struct whpx_state *whpx = &whpx_global;
      HRESULT hr;
- g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
if (!QTAILQ_EMPTY(&cpu->breakpoints) ||
              (whpx->breakpoints.breakpoints &&
@@ -1442,7 +1442,7 @@ static int whpx_handle_halt(CPUState *cpu)
      CPUX86State *env = cpu_env(cpu);
      int ret = 0;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      if (!((cpu->interrupt_request & CPU_INTERRUPT_HARD) &&
            (env->eflags & IF_MASK)) &&
          !(cpu->interrupt_request & CPU_INTERRUPT_NMI)) {
@@ -1450,7 +1450,7 @@ static int whpx_handle_halt(CPUState *cpu)
          cpu->halted = true;
          ret = 1;
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
return ret;
  }
@@ -1472,7 +1472,7 @@ static void whpx_vcpu_pre_run(CPUState *cpu)
      memset(&new_int, 0, sizeof(new_int));
      memset(reg_values, 0, sizeof(reg_values));
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
/* Inject NMI */
      if (!vcpu->interruption_pending &&
@@ -1563,7 +1563,7 @@ static void whpx_vcpu_pre_run(CPUState *cpu)
          reg_count += 1;
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      vcpu->ready_for_pic_interrupt = false;
if (reg_count) {
@@ -1590,9 +1590,9 @@ static void whpx_vcpu_post_run(CPUState *cpu)
      uint64_t tpr = vcpu->exit_ctx.VpContext.Cr8;
      if (vcpu->tpr != tpr) {
          vcpu->tpr = tpr;
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_set_apic_tpr(x86_cpu->apic_state, whpx_cr8_to_apic_tpr(vcpu->tpr));
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
vcpu->interruption_pending =
@@ -1652,7 +1652,7 @@ static int whpx_vcpu_run(CPUState *cpu)
      WhpxStepMode exclusive_step_mode = WHPX_STEP_NONE;
      int ret;
- g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
if (whpx->running_cpus++ == 0) {
          /* Insert breakpoints into memory, update exception exit bitmap. */
@@ -1690,7 +1690,7 @@ static int whpx_vcpu_run(CPUState *cpu)
          }
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (exclusive_step_mode != WHPX_STEP_NONE) {
          start_exclusive();
@@ -2028,9 +2028,9 @@ static int whpx_vcpu_run(CPUState *cpu)
              error_report("WHPX: Unexpected VP exit code %d",
                           vcpu->exit_ctx.ExitReason);
              whpx_get_registers(cpu);
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              qemu_system_guest_panicked(cpu_get_crash_info(cpu));
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              break;
          }
@@ -2055,7 +2055,7 @@ static int whpx_vcpu_run(CPUState *cpu)
          cpu_exec_end(cpu);
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      current_cpu = cpu;
if (--whpx->running_cpus == 0) {
diff --git a/target/loongarch/csr_helper.c b/target/loongarch/csr_helper.c
index 55341551a5..fa3f08335e 100644
--- a/target/loongarch/csr_helper.c
+++ b/target/loongarch/csr_helper.c
@@ -89,9 +89,9 @@ target_ulong helper_csrwr_ticlr(CPULoongArchState *env, target_ulong val)
      int64_t old_v = 0;
if (val & 0x1) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          loongarch_cpu_set_irq(cpu, IRQ_TIMER, 0);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      return old_v;
  }
diff --git a/target/mips/kvm.c b/target/mips/kvm.c
index e22e24ed97..7e2bac9a84 100644
--- a/target/mips/kvm.c
+++ b/target/mips/kvm.c
@@ -138,7 +138,7 @@ void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
      int r;
      struct kvm_mips_interrupt intr;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
if ((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
              cpu_mips_io_interrupts_pending(cpu)) {
@@ -151,7 +151,7 @@ void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
          }
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
diff --git a/target/mips/tcg/sysemu/cp0_helper.c b/target/mips/tcg/sysemu/cp0_helper.c
index d349548743..fe87b72a2c 100644
--- a/target/mips/tcg/sysemu/cp0_helper.c
+++ b/target/mips/tcg/sysemu/cp0_helper.c
@@ -59,9 +59,9 @@ static inline void mips_vpe_wake(MIPSCPU *c)
       * because there might be other conditions that state that c should
       * be sleeping.
       */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      cpu_interrupt(CPU(c), CPU_INTERRUPT_WAKE);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
static inline void mips_vpe_sleep(MIPSCPU *cpu)
diff --git a/target/openrisc/sys_helper.c b/target/openrisc/sys_helper.c
index 782a5751b7..1e9a55cec1 100644
--- a/target/openrisc/sys_helper.c
+++ b/target/openrisc/sys_helper.c
@@ -160,20 +160,20 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
          break;
      case TO_SPR(9, 0):  /* PICMR */
          env->picmr = rb;
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          if (env->picsr & env->picmr) {
              cpu_interrupt(cs, CPU_INTERRUPT_HARD);
          } else {
              cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
          }
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
      case TO_SPR(9, 2):  /* PICSR */
          env->picsr &= ~rb;
          break;
      case TO_SPR(10, 0): /* TTMR */
          {
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              if ((env->ttmr & TTMR_M) ^ (rb & TTMR_M)) {
                  switch (rb & TTMR_M) {
                  case TIMER_NONE:
@@ -198,15 +198,15 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
                  cs->interrupt_request &= ~CPU_INTERRUPT_TIMER;
              }
              cpu_openrisc_timer_update(cpu);
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
          }
          break;
case TO_SPR(10, 1): /* TTCR */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_openrisc_count_set(cpu, rb);
          cpu_openrisc_timer_update(cpu);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
      }
  #endif
@@ -347,9 +347,9 @@ target_ulong HELPER(mfspr)(CPUOpenRISCState *env, target_ulong rd,
          return env->ttmr;
case TO_SPR(10, 1): /* TTCR */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_openrisc_count_update(cpu);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return cpu_openrisc_count_get(cpu);
      }
  #endif
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index a42743a3e0..0a1c942831 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -3056,7 +3056,7 @@ void helper_msgsnd(target_ulong rb)
          return;
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      CPU_FOREACH(cs) {
          PowerPCCPU *cpu = POWERPC_CPU(cs);
          CPUPPCState *cenv = &cpu->env;
@@ -3065,7 +3065,7 @@ void helper_msgsnd(target_ulong rb)
              ppc_set_irq(cpu, irq, 1);
          }
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
/* Server Processor Control */
@@ -3093,7 +3093,7 @@ static void book3s_msgsnd_common(int pir, int irq)
  {
      CPUState *cs;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      CPU_FOREACH(cs) {
          PowerPCCPU *cpu = POWERPC_CPU(cs);
          CPUPPCState *cenv = &cpu->env;
@@ -3103,7 +3103,7 @@ static void book3s_msgsnd_common(int pir, int irq)
              ppc_set_irq(cpu, irq, 1);
          }
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void helper_book3s_msgsnd(target_ulong rb)
@@ -3157,14 +3157,14 @@ void helper_book3s_msgsndp(CPUPPCState *env, target_ulong rb)
      }
/* Does iothread need to be locked for walking CPU list? */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      THREAD_SIBLING_FOREACH(cs, ccs) {
          PowerPCCPU *ccpu = POWERPC_CPU(ccs);
          uint32_t thread_id = ppc_cpu_tir(ccpu);
if (ttir == thread_id) {
              ppc_set_irq(ccpu, PPC_INTERRUPT_DOORBELL, 1);
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              return;
          }
      }
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index 9b1abe2fc4..132834505c 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -1656,7 +1656,7 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
      CPUPPCState *env = &cpu->env;
      int ret;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
switch (run->exit_reason) {
      case KVM_EXIT_DCR:
@@ -1715,7 +1715,7 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
          break;
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      return ret;
  }
diff --git a/target/ppc/misc_helper.c b/target/ppc/misc_helper.c
index a05bdf78c9..41ef14bf24 100644
--- a/target/ppc/misc_helper.c
+++ b/target/ppc/misc_helper.c
@@ -238,7 +238,7 @@ target_ulong helper_load_dpdes(CPUPPCState *env)
          return dpdes;
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      THREAD_SIBLING_FOREACH(cs, ccs) {
          PowerPCCPU *ccpu = POWERPC_CPU(ccs);
          CPUPPCState *cenv = &ccpu->env;
@@ -248,7 +248,7 @@ target_ulong helper_load_dpdes(CPUPPCState *env)
              dpdes |= (0x1 << thread_id);
          }
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
return dpdes;
  }
@@ -278,14 +278,14 @@ void helper_store_dpdes(CPUPPCState *env, target_ulong val)
      }
/* Does iothread need to be locked for walking CPU list? */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      THREAD_SIBLING_FOREACH(cs, ccs) {
          PowerPCCPU *ccpu = POWERPC_CPU(ccs);
          uint32_t thread_id = ppc_cpu_tir(ccpu);
ppc_set_irq(cpu, PPC_INTERRUPT_DOORBELL, val & (0x1 << thread_id));
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
  #endif /* defined(TARGET_PPC64) */
diff --git a/target/ppc/timebase_helper.c b/target/ppc/timebase_helper.c
index 08a6b47ee0..4cc0572fad 100644
--- a/target/ppc/timebase_helper.c
+++ b/target/ppc/timebase_helper.c
@@ -173,9 +173,9 @@ target_ulong helper_load_dcr(CPUPPCState *env, target_ulong dcrn)
      } else {
          int ret;
- qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ret = ppc_dcr_read(env->dcr_env, (uint32_t)dcrn, &val);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          if (unlikely(ret != 0)) {
              qemu_log_mask(LOG_GUEST_ERROR, "DCR read error %d %03x\n",
                            (uint32_t)dcrn, (uint32_t)dcrn);
@@ -196,9 +196,9 @@ void helper_store_dcr(CPUPPCState *env, target_ulong dcrn, target_ulong val)
                                 POWERPC_EXCP_INVAL_INVAL, GETPC());
      } else {
          int ret;
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          ret = ppc_dcr_write(env->dcr_env, (uint32_t)dcrn, (uint32_t)val);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          if (unlikely(ret != 0)) {
              qemu_log_mask(LOG_GUEST_ERROR, "DCR write error %d %03x\n",
                            (uint32_t)dcrn, (uint32_t)dcrn);
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index 33ab3551f4..27533d0401 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -1923,7 +1923,7 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
      S390CPU *cpu = S390_CPU(cs);
      int ret = 0;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
kvm_cpu_synchronize_state(cs); @@ -1947,7 +1947,7 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
              fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
              break;
      }
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (ret == 0) {
          ret = EXCP_INTERRUPT;
diff --git a/target/s390x/tcg/misc_helper.c b/target/s390x/tcg/misc_helper.c
index 6aa7907438..4be69c5ae8 100644
--- a/target/s390x/tcg/misc_helper.c
+++ b/target/s390x/tcg/misc_helper.c
@@ -101,9 +101,9 @@ uint64_t HELPER(stck)(CPUS390XState *env)
  /* SCLP service call */
  uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
  {
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      int r = sclp_service_call(env_archcpu(env), r1, r2);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      if (r < 0) {
          tcg_s390_program_interrupt(env, -r, GETPC());
      }
@@ -117,9 +117,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
      switch (num) {
      case 0x500:
          /* KVM hypercall */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          r = s390_virtio_hypercall(env);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          break;
      case 0x44:
          /* yield */
@@ -127,9 +127,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1, uint32_t r3, uint32_t num)
          break;
      case 0x308:
          /* ipl */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          handle_diag_308(env, r1, r3, GETPC());
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          r = 0;
          break;
      case 0x288:
@@ -185,7 +185,7 @@ static void update_ckc_timer(CPUS390XState *env)
/* stop the timer and remove pending CKC IRQs */
      timer_del(env->tod_timer);
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
      env->pending_int &= ~INTERRUPT_EXT_CLOCK_COMPARATOR;
/* the tod has to exceed the ckc, this can never happen if ckc is all 1's */
@@ -207,9 +207,9 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t ckc)
  {
      env->ckc = ckc;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      update_ckc_timer(env);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data opaque)
@@ -229,9 +229,9 @@ uint32_t HELPER(sck)(CPUS390XState *env, uint64_t tod_low)
          .low = tod_low,
      };
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      tdc->set(td, &tod, &error_abort);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      return 0;
  }
@@ -421,9 +421,9 @@ uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
      int cc;
/* TODO: needed to inject interrupts - push further down */
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      cc = handle_sigp(env, order_code & SIGP_ORDER_MASK, r1, r3);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
return cc;
  }
@@ -433,92 +433,92 @@ uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,
  void HELPER(xsch)(CPUS390XState *env, uint64_t r1)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_xsch(cpu, r1, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(csch)(CPUS390XState *env, uint64_t r1)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_csch(cpu, r1, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(hsch)(CPUS390XState *env, uint64_t r1)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_hsch(cpu, r1, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(msch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_msch(cpu, r1, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(rchp)(CPUS390XState *env, uint64_t r1)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_rchp(cpu, r1, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(rsch)(CPUS390XState *env, uint64_t r1)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_rsch(cpu, r1, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(sal)(CPUS390XState *env, uint64_t r1)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_sal(cpu, r1, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(schm)(CPUS390XState *env, uint64_t r1, uint64_t r2, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_schm(cpu, r1, r2, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(ssch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_ssch(cpu, r1, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(stcrw)(CPUS390XState *env, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_stcrw(cpu, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(stsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_stsch(cpu, r1, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
uint32_t HELPER(tpi)(CPUS390XState *env, uint64_t addr)
@@ -533,10 +533,10 @@ uint32_t HELPER(tpi)(CPUS390XState *env, uint64_t addr)
          tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra);
      }
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      io = qemu_s390_flic_dequeue_io(flic, env->cregs[6]);
      if (!io) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
          return 0;
      }
@@ -554,7 +554,7 @@ uint32_t HELPER(tpi)(CPUS390XState *env, uint64_t addr)
          if (s390_cpu_virt_mem_write(cpu, addr, 0, &intc, sizeof(intc))) {
              /* writing failed, reinject and properly clean up */
              s390_io_interrupt(io->id, io->nr, io->parm, io->word);
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              g_free(io);
              s390_cpu_virt_mem_handle_exc(cpu, ra);
              return 0;
@@ -570,24 +570,24 @@ uint32_t HELPER(tpi)(CPUS390XState *env, uint64_t addr)
      }
g_free(io);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      return 1;
  }
void HELPER(tsch)(CPUS390XState *env, uint64_t r1, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_tsch(cpu, r1, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(chsc)(CPUS390XState *env, uint64_t inst)
  {
      S390CPU *cpu = env_archcpu(env);
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      ioinst_handle_chsc(cpu, inst >> 16, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
  #endif
@@ -726,27 +726,27 @@ void HELPER(clp)(CPUS390XState *env, uint32_t r2)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      clp_service_call(cpu, r2, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(pcilg)(CPUS390XState *env, uint32_t r1, uint32_t r2)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      pcilg_service_call(cpu, r1, r2, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(pcistg)(CPUS390XState *env, uint32_t r1, uint32_t r2)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      pcistg_service_call(cpu, r1, r2, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(stpcifc)(CPUS390XState *env, uint32_t r1, uint64_t fiba,
@@ -754,9 +754,9 @@ void HELPER(stpcifc)(CPUS390XState *env, uint32_t r1, uint64_t fiba,
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      stpcifc_service_call(cpu, r1, fiba, ar, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(sic)(CPUS390XState *env, uint64_t r1, uint64_t r3)
@@ -764,9 +764,9 @@ void HELPER(sic)(CPUS390XState *env, uint64_t r1, uint64_t r3)
      S390CPU *cpu = env_archcpu(env);
      int r;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      r = css_do_sic(cpu, (r3 >> 27) & 0x7, r1 & 0xffff);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      /* css_do_sic() may actually return a PGM_xxx value to inject */
      if (r) {
          tcg_s390_program_interrupt(env, -r, GETPC());
@@ -777,9 +777,9 @@ void HELPER(rpcit)(CPUS390XState *env, uint32_t r1, uint32_t r2)
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      rpcit_service_call(cpu, r1, r2, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(pcistb)(CPUS390XState *env, uint32_t r1, uint32_t r3,
@@ -787,9 +787,9 @@ void HELPER(pcistb)(CPUS390XState *env, uint32_t r1, uint32_t r3,
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      pcistb_service_call(cpu, r1, r3, gaddr, ar, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(mpcifc)(CPUS390XState *env, uint32_t r1, uint64_t fiba,
@@ -797,8 +797,8 @@ void HELPER(mpcifc)(CPUS390XState *env, uint32_t r1, uint64_t fiba,
  {
      S390CPU *cpu = env_archcpu(env);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      mpcifc_service_call(cpu, r1, fiba, ar, GETPC());
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
  #endif
diff --git a/target/sparc/int32_helper.c b/target/sparc/int32_helper.c
index 1563613582..3fd28a04e7 100644
--- a/target/sparc/int32_helper.c
+++ b/target/sparc/int32_helper.c
@@ -70,7 +70,7 @@ void cpu_check_irqs(CPUSPARCState *env)
      CPUState *cs;
/* We should be holding the BQL before we mess with IRQs */
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
if (env->pil_in && (env->interrupt_index == 0 ||
                          (env->interrupt_index & ~15) == TT_EXTINT)) {
diff --git a/target/sparc/int64_helper.c b/target/sparc/int64_helper.c
index 1b4155f5f3..dacbbf6b5b 100644
--- a/target/sparc/int64_helper.c
+++ b/target/sparc/int64_helper.c
@@ -69,7 +69,7 @@ void cpu_check_irqs(CPUSPARCState *env)
                    (env->softint & ~(SOFTINT_TIMER | SOFTINT_STIMER));
/* We should be holding the BQL before we mess with IRQs */
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(qemu_bql_locked());
/* TT_IVEC has a higher priority (16) than TT_EXTINT (31..17) */
      if (env->ivec_status & 0x20) {
@@ -267,9 +267,9 @@ static bool do_modify_softint(CPUSPARCState *env, uint32_t value)
          env->softint = value;
  #if !defined(CONFIG_USER_ONLY)
          if (cpu_interrupts_enabled(env)) {
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
              cpu_check_irqs(env);
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
          }
  #endif
          return true;
diff --git a/target/sparc/win_helper.c b/target/sparc/win_helper.c
index 16d1c70fe7..ba666ec50e 100644
--- a/target/sparc/win_helper.c
+++ b/target/sparc/win_helper.c
@@ -179,9 +179,9 @@ void helper_wrpsr(CPUSPARCState *env, target_ulong new_psr)
          cpu_raise_exception_ra(env, TT_ILL_INSN, GETPC());
      } else {
          /* cpu_put_psr may trigger interrupts, hence BQL */
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_put_psr(env, new_psr);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  }
@@ -407,9 +407,9 @@ void helper_wrpstate(CPUSPARCState *env, target_ulong new_state) #if !defined(CONFIG_USER_ONLY)
      if (cpu_interrupts_enabled(env)) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_check_irqs(env);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  #endif
  }
@@ -422,9 +422,9 @@ void helper_wrpil(CPUSPARCState *env, target_ulong new_pil)
      env->psrpil = new_pil;
if (cpu_interrupts_enabled(env)) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_check_irqs(env);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  #endif
  }
@@ -451,9 +451,9 @@ void helper_done(CPUSPARCState *env)
#if !defined(CONFIG_USER_ONLY)
      if (cpu_interrupts_enabled(env)) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_check_irqs(env);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  #endif
  }
@@ -480,9 +480,9 @@ void helper_retry(CPUSPARCState *env)
#if !defined(CONFIG_USER_ONLY)
      if (cpu_interrupts_enabled(env)) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          cpu_check_irqs(env);
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  #endif
  }
diff --git a/target/xtensa/exc_helper.c b/target/xtensa/exc_helper.c
index 91354884f7..405387decb 100644
--- a/target/xtensa/exc_helper.c
+++ b/target/xtensa/exc_helper.c
@@ -105,9 +105,9 @@ void HELPER(waiti)(CPUXtensaState *env, uint32_t pc, uint32_t intlevel)
      env->sregs[PS] = (env->sregs[PS] & ~PS_INTLEVEL) |
          (intlevel << PS_INTLEVEL_SHIFT);
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      check_interrupts(env);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
if (env->pending_irq_level) {
          cpu_loop_exit(cpu);
@@ -120,9 +120,9 @@ void HELPER(waiti)(CPUXtensaState *env, uint32_t pc, uint32_t intlevel)
void HELPER(check_interrupts)(CPUXtensaState *env)
  {
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      check_interrupts(env);
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
  }
void HELPER(intset)(CPUXtensaState *env, uint32_t v)
diff --git a/ui/spice-core.c b/ui/spice-core.c
index db21db2c94..1d895d2fe8 100644
--- a/ui/spice-core.c
+++ b/ui/spice-core.c
@@ -222,7 +222,7 @@ static void channel_event(int event, SpiceChannelEventInfo *info)
       */
      bool need_lock = !qemu_thread_is_self(&me);
      if (need_lock) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
if (info->flags & SPICE_CHANNEL_EVENT_FLAG_ADDR_EXT) {
@@ -260,7 +260,7 @@ static void channel_event(int event, SpiceChannelEventInfo *info)
      }
if (need_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
qapi_free_SpiceServerInfo(server);
diff --git a/util/async.c b/util/async.c
index 8f90ddc304..49d07b3c73 100644
--- a/util/async.c
+++ b/util/async.c
@@ -741,7 +741,7 @@ AioContext *qemu_get_current_aio_context(void)
      if (ctx) {
          return ctx;
      }
-    if (qemu_mutex_iothread_locked()) {
+    if (qemu_bql_locked()) {
          /* Possibly in a vCPU thread.  */
          return qemu_get_aio_context();
      }
diff --git a/util/main-loop.c b/util/main-loop.c
index 797b640c41..921fab3f32 100644
--- a/util/main-loop.c
+++ b/util/main-loop.c
@@ -302,13 +302,13 @@ static int os_host_main_loop_wait(int64_t timeout)
glib_pollfds_fill(&timeout); - qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      replay_mutex_unlock();
ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout); replay_mutex_lock();
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
glib_pollfds_poll(); @@ -517,7 +517,7 @@ static int os_host_main_loop_wait(int64_t timeout) poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout); - qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
replay_mutex_unlock(); @@ -525,7 +525,7 @@ static int os_host_main_loop_wait(int64_t timeout) replay_mutex_lock(); - qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      if (g_poll_ret > 0) {
          for (i = 0; i < w->num; i++) {
              w->revents[i] = poll_fds[n_poll_fds + i].revents;
diff --git a/util/rcu.c b/util/rcu.c
index e587bcc483..8331f24288 100644
--- a/util/rcu.c
+++ b/util/rcu.c
@@ -283,24 +283,24 @@ static void *call_rcu_thread(void *opaque)
qatomic_sub(&rcu_call_count, n);
          synchronize_rcu();
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
          while (n > 0) {
              node = try_dequeue();
              while (!node) {
-                qemu_mutex_unlock_iothread();
+                qemu_bql_unlock();
                  qemu_event_reset(&rcu_call_ready_event);
                  node = try_dequeue();
                  if (!node) {
                      qemu_event_wait(&rcu_call_ready_event);
                      node = try_dequeue();
                  }
-                qemu_mutex_lock_iothread();
+                qemu_bql_lock();
              }
n--;
              node->func(node);
          }
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      abort();
  }
@@ -337,13 +337,13 @@ static void drain_rcu_callback(struct rcu_head *node)
  void drain_call_rcu(void)
  {
      struct rcu_drain rcu_drain;
-    bool locked = qemu_mutex_iothread_locked();
+    bool locked = qemu_bql_locked();
memset(&rcu_drain, 0, sizeof(struct rcu_drain));
      qemu_event_init(&rcu_drain.drain_complete_event, false);
if (locked) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
@@ -365,7 +365,7 @@ void drain_call_rcu(void)
      qatomic_dec(&in_drain_call_rcu);
if (locked) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
}
diff --git a/audio/coreaudio.m b/audio/coreaudio.m
index 8cd129a27d..866d7a9436 100644
--- a/audio/coreaudio.m
+++ b/audio/coreaudio.m
@@ -547,7 +547,7 @@ static OSStatus handle_voice_change(
  {
      coreaudioVoiceOut *core = in_client_data;
- qemu_mutex_lock_iothread();
+    qemu_bql_lock();
if (core->outputDeviceID) {
          fini_out_device(core);
@@ -557,7 +557,7 @@ static OSStatus handle_voice_change(
          update_device_playback_state(core);
      }
- qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      return 0;
  }
diff --git a/memory_ldst.c.inc b/memory_ldst.c.inc
index 84b868f294..cd8a629816 100644
--- a/memory_ldst.c.inc
+++ b/memory_ldst.c.inc
@@ -61,7 +61,7 @@ static inline uint32_t glue(address_space_ldl_internal, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
      return val;
@@ -130,7 +130,7 @@ static inline uint64_t glue(address_space_ldq_internal, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
      return val;
@@ -186,7 +186,7 @@ uint8_t glue(address_space_ldub, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
      return val;
@@ -234,7 +234,7 @@ static inline uint16_t glue(address_space_lduw_internal, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
      return val;
@@ -295,7 +295,7 @@ void glue(address_space_stl_notdirty, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
  }
@@ -339,7 +339,7 @@ static inline void glue(address_space_stl_internal, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
  }
@@ -391,7 +391,7 @@ void glue(address_space_stb, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
  }
@@ -435,7 +435,7 @@ static inline void glue(address_space_stw_internal, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
  }
@@ -499,7 +499,7 @@ static void glue(address_space_stq_internal, SUFFIX)(ARG1_DECL,
          *result = r;
      }
      if (release_lock) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      RCU_READ_UNLOCK();
  }
diff --git a/target/i386/hvf/README.md b/target/i386/hvf/README.md
index 2d33477aca..679b93b630 100644
--- a/target/i386/hvf/README.md
+++ b/target/i386/hvf/README.md
@@ -4,4 +4,4 @@ These sources (and ../hvf-all.c) are adapted from Veertu Inc's vdhh (Veertu Desk
1. Adapt to our current QEMU's `CPUState` structure and `address_space_rw` API; many struct members have been moved around (emulated x86 state, xsave_buf) due to historical differences + QEMU needing to handle more emulation targets.
  2. Removal of `apic_page` and hyperv-related functionality.
-3. More relaxed use of `qemu_mutex_lock_iothread`.
+3. More relaxed use of `qemu_bql_lock`.
diff --git a/ui/cocoa.m b/ui/cocoa.m
index cd069da696..8a7d0a6f0c 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -117,29 +117,29 @@ static void cocoa_switch(DisplayChangeListener *dcl,
  typedef void (^CodeBlock)(void);
  typedef bool (^BoolCodeBlock)(void);
-static void with_iothread_lock(CodeBlock block)
+static void with_bql(CodeBlock block)
  {
-    bool locked = qemu_mutex_iothread_locked();
+    bool locked = qemu_bql_locked();
      if (!locked) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
      block();
      if (!locked) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
  }
-static bool bool_with_iothread_lock(BoolCodeBlock block)
+static bool bool_with_bql(BoolCodeBlock block)
  {
-    bool locked = qemu_mutex_iothread_locked();
+    bool locked = qemu_bql_locked();
      bool val;
if (!locked) {
-        qemu_mutex_lock_iothread();
+        qemu_bql_lock();
      }
      val = block();
      if (!locked) {
-        qemu_mutex_unlock_iothread();
+        qemu_bql_unlock();
      }
      return val;
  }
@@ -605,7 +605,7 @@ - (void) updateUIInfo
          return;
      }
- with_iothread_lock(^{
+    with_bql(^{
          [self updateUIInfoLocked];
      });
  }
@@ -790,7 +790,7 @@ - (void) handleMonitorInput:(NSEvent *)event
- (bool) handleEvent:(NSEvent *)event
  {
-    return bool_with_iothread_lock(^{
+    return bool_with_bql(^{
          return [self handleEventLocked:event];
      });
  }
@@ -1182,7 +1182,7 @@ - (QEMUScreen) gscreen {return screen;}
   */
  - (void) raiseAllKeys
  {
-    with_iothread_lock(^{
+    with_bql(^{
          qkbd_state_lift_all_keys(kbd);
      });
  }
@@ -1282,7 +1282,7 @@ - (void)applicationWillTerminate:(NSNotification *)aNotification
  {
      COCOA_DEBUG("QemuCocoaAppController: applicationWillTerminate\n");
- with_iothread_lock(^{
+    with_bql(^{
          shutdown_action = SHUTDOWN_ACTION_POWEROFF;
          qemu_system_shutdown_request(SHUTDOWN_CAUSE_HOST_UI);
      });
@@ -1420,7 +1420,7 @@ - (void)displayConsole:(id)sender
  /* Pause the guest */
  - (void)pauseQEMU:(id)sender
  {
-    with_iothread_lock(^{
+    with_bql(^{
          qmp_stop(NULL);
      });
      [sender setEnabled: NO];
@@ -1431,7 +1431,7 @@ - (void)pauseQEMU:(id)sender
  /* Resume running the guest operating system */
  - (void)resumeQEMU:(id) sender
  {
-    with_iothread_lock(^{
+    with_bql(^{
          qmp_cont(NULL);
      });
      [sender setEnabled: NO];
@@ -1461,7 +1461,7 @@ - (void)removePause
  /* Restarts QEMU */
  - (void)restartQEMU:(id)sender
  {
-    with_iothread_lock(^{
+    with_bql(^{
          qmp_system_reset(NULL);
      });
  }
@@ -1469,7 +1469,7 @@ - (void)restartQEMU:(id)sender
  /* Powers down QEMU */
  - (void)powerDownQEMU:(id)sender
  {
-    with_iothread_lock(^{
+    with_bql(^{
          qmp_system_powerdown(NULL);
      });
  }
@@ -1488,7 +1488,7 @@ - (void)ejectDeviceMedia:(id)sender
      }
__block Error *err = NULL;
-    with_iothread_lock(^{
+    with_bql(^{
          qmp_eject([drive cStringUsingEncoding: NSASCIIStringEncoding],
                    NULL, false, false, &err);
      });
@@ -1523,7 +1523,7 @@ - (void)changeDeviceMedia:(id)sender
          }
__block Error *err = NULL;
-        with_iothread_lock(^{
+        with_bql(^{
              qmp_blockdev_change_medium([drive cStringUsingEncoding:
                                                    NSASCIIStringEncoding],
                                         NULL,
@@ -1605,7 +1605,7 @@ - (void)adjustSpeed:(id)sender
      // get the throttle percentage
      throttle_pct = [sender tag];
- with_iothread_lock(^{
+    with_bql(^{
          cpu_throttle_set(throttle_pct);
      });
      COCOA_DEBUG("cpu throttling at %d%c\n", cpu_throttle_get_percentage(), '%');
@@ -1819,7 +1819,7 @@ - (void)pasteboard:(NSPasteboard *)sender provideDataForType:(NSPasteboardType)t
          return;
      }
- with_iothread_lock(^{
+    with_bql(^{
          QemuClipboardInfo *info = qemu_clipboard_info_ref(cbinfo);
          qemu_event_reset(&cbevent);
          qemu_clipboard_request(info, QEMU_CLIPBOARD_TYPE_TEXT);
@@ -1827,9 +1827,9 @@ - (void)pasteboard:(NSPasteboard *)sender provideDataForType:(NSPasteboardType)t
          while (info == cbinfo &&
                 info->types[QEMU_CLIPBOARD_TYPE_TEXT].available &&
                 info->types[QEMU_CLIPBOARD_TYPE_TEXT].data == NULL) {
-            qemu_mutex_unlock_iothread();
+            qemu_bql_unlock();
              qemu_event_wait(&cbevent);
-            qemu_mutex_lock_iothread();
+            qemu_bql_lock();
          }
if (info == cbinfo) {
@@ -1927,9 +1927,9 @@ static void cocoa_clipboard_request(QemuClipboardInfo *info,
      int status;
COCOA_DEBUG("Second thread: calling qemu_default_main()\n");
-    qemu_mutex_lock_iothread();
+    qemu_bql_lock();
      status = qemu_default_main();
-    qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      COCOA_DEBUG("Second thread: qemu_default_main() returned, exiting\n");
      [cbowner release];
      exit(status);
@@ -1941,7 +1941,7 @@ static int cocoa_main(void)
COCOA_DEBUG("Entered %s()\n", __func__); - qemu_mutex_unlock_iothread();
+    qemu_bql_unlock();
      qemu_thread_create(&thread, "qemu_main", call_qemu_main,
                         NULL, QEMU_THREAD_DETACHED);




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