Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

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# gpg: Signature made Mon 08 Jan 2024 16:37:25 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  Rename "QEMU global mutex" to "BQL" in comments and docs
  Replace "iothread lock" with "BQL" in comments
  qemu/main-loop: rename qemu_cond_wait_iothread() to qemu_cond_wait_bql()
  qemu/main-loop: rename QEMU_IOTHREAD_LOCK_GUARD to BQL_LOCK_GUARD
  system/cpus: rename qemu_mutex_lock_iothread() to bql_lock()
  iothread: Remove unused Error** argument in aio_context_set_aio_params

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

12 files changed, 67 insertions, 67 deletions

diff --git a/accel/accel-blocker.c b/accel/accel-blocker.c
index 1e7f423..e083f24 100644
--- a/accel/accel-blocker.c
+++ b/accel/accel-blocker.c
@@ -41,7 +41,7 @@ void accel_blocker_init(void)
 
 void accel_ioctl_begin(void)
 {
-    if (likely(qemu_mutex_iothread_locked())) {
+    if (likely(bql_locked())) {
         return;
     }
 
@@ -51,7 +51,7 @@ void accel_ioctl_begin(void)
 
 void accel_ioctl_end(void)
 {
-    if (likely(qemu_mutex_iothread_locked())) {
+    if (likely(bql_locked())) {
         return;
     }
 
@@ -62,7 +62,7 @@ void accel_ioctl_end(void)
 
 void accel_cpu_ioctl_begin(CPUState *cpu)
 {
-    if (unlikely(qemu_mutex_iothread_locked())) {
+    if (unlikely(bql_locked())) {
         return;
     }
 
@@ -72,7 +72,7 @@ void accel_cpu_ioctl_begin(CPUState *cpu)
 
 void accel_cpu_ioctl_end(CPUState *cpu)
 {
-    if (unlikely(qemu_mutex_iothread_locked())) {
+    if (unlikely(bql_locked())) {
         return;
     }
 
@@ -105,7 +105,7 @@ void accel_ioctl_inhibit_begin(void)
      * We allow to inhibit only when holding the BQL, so we can identify
      * when an inhibitor wants to issue an ioctl easily.
      */
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(bql_locked());
 
     /* Block further invocations of the ioctls outside the BQL.  */
     CPU_FOREACH(cpu) {
diff --git a/accel/dummy-cpus.c b/accel/dummy-cpus.c
index b75c919..f4b0ec5 100644
--- a/accel/dummy-cpus.c
+++ b/accel/dummy-cpus.c
@@ -24,7 +24,7 @@ static void *dummy_cpu_thread_fn(void *arg)
 
     rcu_register_thread();
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     qemu_thread_get_self(cpu->thread);
     cpu->thread_id = qemu_get_thread_id();
     cpu->neg.can_do_io = true;
@@ -43,7 +43,7 @@ static void *dummy_cpu_thread_fn(void *arg)
     qemu_guest_random_seed_thread_part2(cpu->random_seed);
 
     do {
-        qemu_mutex_unlock_iothread();
+        bql_unlock();
 #ifndef _WIN32
         do {
             int sig;
@@ -56,11 +56,11 @@ static void *dummy_cpu_thread_fn(void *arg)
 #else
         qemu_sem_wait(&cpu->sem);
 #endif
-        qemu_mutex_lock_iothread();
+        bql_lock();
         qemu_wait_io_event(cpu);
     } while (!cpu->unplug);
 
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
     rcu_unregister_thread();
     return NULL;
 }
diff --git a/accel/hvf/hvf-accel-ops.c b/accel/hvf/hvf-accel-ops.c
index abe7adf..8eabb69 100644
--- a/accel/hvf/hvf-accel-ops.c
+++ b/accel/hvf/hvf-accel-ops.c
@@ -424,7 +424,7 @@ static void *hvf_cpu_thread_fn(void *arg)
 
     rcu_register_thread();
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     qemu_thread_get_self(cpu->thread);
 
     cpu->thread_id = qemu_get_thread_id();
@@ -449,7 +449,7 @@ static void *hvf_cpu_thread_fn(void *arg)
 
     hvf_vcpu_destroy(cpu);
     cpu_thread_signal_destroyed(cpu);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
     rcu_unregister_thread();
     return NULL;
 }
diff --git a/accel/kvm/kvm-accel-ops.c b/accel/kvm/kvm-accel-ops.c
index 6195150..45ff06e 100644
--- a/accel/kvm/kvm-accel-ops.c
+++ b/accel/kvm/kvm-accel-ops.c
@@ -33,7 +33,7 @@ static void *kvm_vcpu_thread_fn(void *arg)
 
     rcu_register_thread();
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     qemu_thread_get_self(cpu->thread);
     cpu->thread_id = qemu_get_thread_id();
     cpu->neg.can_do_io = true;
@@ -58,7 +58,7 @@ static void *kvm_vcpu_thread_fn(void *arg)
 
     kvm_destroy_vcpu(cpu);
     cpu_thread_signal_destroyed(cpu);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
     rcu_unregister_thread();
     return NULL;
 }
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index eb17773..bbc6014 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -806,7 +806,7 @@ static void kvm_dirty_ring_flush(void)
      * should always be with BQL held, serialization is guaranteed.
      * However, let's be sure of it.
      */
-    assert(qemu_mutex_iothread_locked());
+    assert(bql_locked());
     /*
      * First make sure to flush the hardware buffers by kicking all
      * vcpus out in a synchronous way.
@@ -1391,9 +1391,9 @@ static void *kvm_dirty_ring_reaper_thread(void *data)
         trace_kvm_dirty_ring_reaper("wakeup");
         r->reaper_state = KVM_DIRTY_RING_REAPER_REAPING;
 
-        qemu_mutex_lock_iothread();
+        bql_lock();
         kvm_dirty_ring_reap(s, NULL);
-        qemu_mutex_unlock_iothread();
+        bql_unlock();
 
         r->reaper_iteration++;
     }
@@ -2817,7 +2817,7 @@ int kvm_cpu_exec(CPUState *cpu)
         return EXCP_HLT;
     }
 
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
     cpu_exec_start(cpu);
 
     do {
@@ -2857,11 +2857,11 @@ int kvm_cpu_exec(CPUState *cpu)
 
 #ifdef KVM_HAVE_MCE_INJECTION
         if (unlikely(have_sigbus_pending)) {
-            qemu_mutex_lock_iothread();
+            bql_lock();
             kvm_arch_on_sigbus_vcpu(cpu, pending_sigbus_code,
                                     pending_sigbus_addr);
             have_sigbus_pending = false;
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
         }
 #endif
 
@@ -2927,7 +2927,7 @@ int kvm_cpu_exec(CPUState *cpu)
              * still full.  Got kicked by KVM_RESET_DIRTY_RINGS.
              */
             trace_kvm_dirty_ring_full(cpu->cpu_index);
-            qemu_mutex_lock_iothread();
+            bql_lock();
             /*
              * We throttle vCPU by making it sleep once it exit from kernel
              * due to dirty ring full. In the dirtylimit scenario, reaping
@@ -2939,7 +2939,7 @@ int kvm_cpu_exec(CPUState *cpu)
             } else {
                 kvm_dirty_ring_reap(kvm_state, NULL);
             }
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             dirtylimit_vcpu_execute(cpu);
             ret = 0;
             break;
@@ -2956,9 +2956,9 @@ int kvm_cpu_exec(CPUState *cpu)
                 break;
             case KVM_SYSTEM_EVENT_CRASH:
                 kvm_cpu_synchronize_state(cpu);
-                qemu_mutex_lock_iothread();
+                bql_lock();
                 qemu_system_guest_panicked(cpu_get_crash_info(cpu));
-                qemu_mutex_unlock_iothread();
+                bql_unlock();
                 ret = 0;
                 break;
             default:
@@ -2973,7 +2973,7 @@ int kvm_cpu_exec(CPUState *cpu)
     } while (ret == 0);
 
     cpu_exec_end(cpu);
-    qemu_mutex_lock_iothread();
+    bql_lock();
 
     if (ret < 0) {
         cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index c938eb9..67eda98 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -558,8 +558,8 @@ static void cpu_exec_longjmp_cleanup(CPUState *cpu)
         tcg_ctx->gen_tb = NULL;
     }
 #endif
-    if (qemu_mutex_iothread_locked()) {
-        qemu_mutex_unlock_iothread();
+    if (bql_locked()) {
+        bql_unlock();
     }
     assert_no_pages_locked();
 }
@@ -680,10 +680,10 @@ static inline bool cpu_handle_halt(CPUState *cpu)
 #if defined(TARGET_I386)
         if (cpu->interrupt_request & CPU_INTERRUPT_POLL) {
             X86CPU *x86_cpu = X86_CPU(cpu);
-            qemu_mutex_lock_iothread();
+            bql_lock();
             apic_poll_irq(x86_cpu->apic_state);
             cpu_reset_interrupt(cpu, CPU_INTERRUPT_POLL);
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
         }
 #endif /* TARGET_I386 */
         if (!cpu_has_work(cpu)) {
@@ -749,9 +749,9 @@ static inline bool cpu_handle_exception(CPUState *cpu, int *ret)
 #else
         if (replay_exception()) {
             CPUClass *cc = CPU_GET_CLASS(cpu);
-            qemu_mutex_lock_iothread();
+            bql_lock();
             cc->tcg_ops->do_interrupt(cpu);
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             cpu->exception_index = -1;
 
             if (unlikely(cpu->singlestep_enabled)) {
@@ -812,7 +812,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
 
     if (unlikely(qatomic_read(&cpu->interrupt_request))) {
         int interrupt_request;
-        qemu_mutex_lock_iothread();
+        bql_lock();
         interrupt_request = cpu->interrupt_request;
         if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) {
             /* Mask out external interrupts for this step. */
@@ -821,7 +821,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
         if (interrupt_request & CPU_INTERRUPT_DEBUG) {
             cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
             cpu->exception_index = EXCP_DEBUG;
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             return true;
         }
 #if !defined(CONFIG_USER_ONLY)
@@ -832,7 +832,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
             cpu->interrupt_request &= ~CPU_INTERRUPT_HALT;
             cpu->halted = 1;
             cpu->exception_index = EXCP_HLT;
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             return true;
         }
 #if defined(TARGET_I386)
@@ -843,14 +843,14 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
             cpu_svm_check_intercept_param(env, SVM_EXIT_INIT, 0, 0);
             do_cpu_init(x86_cpu);
             cpu->exception_index = EXCP_HALTED;
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             return true;
         }
 #else
         else if (interrupt_request & CPU_INTERRUPT_RESET) {
             replay_interrupt();
             cpu_reset(cpu);
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             return true;
         }
 #endif /* !TARGET_I386 */
@@ -873,7 +873,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
                  */
                 if (unlikely(cpu->singlestep_enabled)) {
                     cpu->exception_index = EXCP_DEBUG;
-                    qemu_mutex_unlock_iothread();
+                    bql_unlock();
                     return true;
                 }
                 cpu->exception_index = -1;
@@ -892,7 +892,7 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
         }
 
         /* If we exit via cpu_loop_exit/longjmp it is reset in cpu_exec */
-        qemu_mutex_unlock_iothread();
+        bql_unlock();
     }
 
     /* Finally, check if we need to exit to the main loop.  */
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index db3f93f..3facfcb 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1975,7 +1975,7 @@ static void *atomic_mmu_lookup(CPUState *cpu, vaddr addr, MemOpIdx oi,
  * @size: number of bytes
  * @mmu_idx: virtual address context
  * @ra: return address into tcg generated code, or 0
- * Context: iothread lock held
+ * Context: BQL held
  *
  * Load @size bytes from @addr, which is memory-mapped i/o.
  * The bytes are concatenated in big-endian order with @ret_be.
@@ -2030,10 +2030,10 @@ static uint64_t do_ld_mmio_beN(CPUState *cpu, CPUTLBEntryFull *full,
     section = io_prepare(&mr_offset, cpu, full->xlat_section, attrs, addr, ra);
     mr = section->mr;
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     ret = int_ld_mmio_beN(cpu, full, ret_be, addr, size, mmu_idx,
                           type, ra, mr, mr_offset);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
 
     return ret;
 }
@@ -2054,12 +2054,12 @@ static Int128 do_ld16_mmio_beN(CPUState *cpu, CPUTLBEntryFull *full,
     section = io_prepare(&mr_offset, cpu, full->xlat_section, attrs, addr, ra);
     mr = section->mr;
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     a = int_ld_mmio_beN(cpu, full, ret_be, addr, size - 8, mmu_idx,
                         MMU_DATA_LOAD, ra, mr, mr_offset);
     b = int_ld_mmio_beN(cpu, full, ret_be, addr + size - 8, 8, mmu_idx,
                         MMU_DATA_LOAD, ra, mr, mr_offset + size - 8);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
 
     return int128_make128(b, a);
 }
@@ -2521,7 +2521,7 @@ static Int128 do_ld16_mmu(CPUState *cpu, vaddr addr,
  * @size: number of bytes
  * @mmu_idx: virtual address context
  * @ra: return address into tcg generated code, or 0
- * Context: iothread lock held
+ * Context: BQL held
  *
  * Store @size bytes at @addr, which is memory-mapped i/o.
  * The bytes to store are extracted in little-endian order from @val_le;
@@ -2577,10 +2577,10 @@ static uint64_t do_st_mmio_leN(CPUState *cpu, CPUTLBEntryFull *full,
     section = io_prepare(&mr_offset, cpu, full->xlat_section, attrs, addr, ra);
     mr = section->mr;
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     ret = int_st_mmio_leN(cpu, full, val_le, addr, size, mmu_idx,
                           ra, mr, mr_offset);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
 
     return ret;
 }
@@ -2601,12 +2601,12 @@ static uint64_t do_st16_mmio_leN(CPUState *cpu, CPUTLBEntryFull *full,
     section = io_prepare(&mr_offset, cpu, full->xlat_section, attrs, addr, ra);
     mr = section->mr;
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     int_st_mmio_leN(cpu, full, int128_getlo(val_le), addr, 8,
                     mmu_idx, ra, mr, mr_offset);
     ret = int_st_mmio_leN(cpu, full, int128_gethi(val_le), addr + 8,
                           size - 8, mmu_idx, ra, mr, mr_offset + 8);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
 
     return ret;
 }
diff --git a/accel/tcg/tcg-accel-ops-icount.c b/accel/tcg/tcg-accel-ops-icount.c
index b25685f..9e1ae66 100644
--- a/accel/tcg/tcg-accel-ops-icount.c
+++ b/accel/tcg/tcg-accel-ops-icount.c
@@ -123,12 +123,12 @@ void icount_prepare_for_run(CPUState *cpu, int64_t cpu_budget)
 
     if (cpu->icount_budget == 0) {
         /*
-         * We're called without the iothread lock, so must take it while
+         * We're called without the BQL, so must take it while
          * we're calling timer handlers.
          */
-        qemu_mutex_lock_iothread();
+        bql_lock();
         icount_notify_aio_contexts();
-        qemu_mutex_unlock_iothread();
+        bql_unlock();
     }
 }
 
diff --git a/accel/tcg/tcg-accel-ops-mttcg.c b/accel/tcg/tcg-accel-ops-mttcg.c
index fac8009..af73070 100644
--- a/accel/tcg/tcg-accel-ops-mttcg.c
+++ b/accel/tcg/tcg-accel-ops-mttcg.c
@@ -76,7 +76,7 @@ static void *mttcg_cpu_thread_fn(void *arg)
     rcu_add_force_rcu_notifier(&force_rcu.notifier);
     tcg_register_thread();
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     qemu_thread_get_self(cpu->thread);
 
     cpu->thread_id = qemu_get_thread_id();
@@ -91,9 +91,9 @@ static void *mttcg_cpu_thread_fn(void *arg)
     do {
         if (cpu_can_run(cpu)) {
             int r;
-            qemu_mutex_unlock_iothread();
+            bql_unlock();
             r = tcg_cpus_exec(cpu);
-            qemu_mutex_lock_iothread();
+            bql_lock();
             switch (r) {
             case EXCP_DEBUG:
                 cpu_handle_guest_debug(cpu);
@@ -105,9 +105,9 @@ static void *mttcg_cpu_thread_fn(void *arg)
                  */
                 break;
             case EXCP_ATOMIC:
-                qemu_mutex_unlock_iothread();
+                bql_unlock();
                 cpu_exec_step_atomic(cpu);
-                qemu_mutex_lock_iothread();
+                bql_lock();
             default:
                 /* Ignore everything else? */
                 break;
@@ -119,7 +119,7 @@ static void *mttcg_cpu_thread_fn(void *arg)
     } while (!cpu->unplug || cpu_can_run(cpu));
 
     tcg_cpus_destroy(cpu);
-    qemu_mutex_unlock_iothread();
+    bql_unlock();
     rcu_remove_force_rcu_notifier(&force_rcu.notifier);
     rcu_unregister_thread();
     return NULL;
diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index 825e35b..3208035 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -111,7 +111,7 @@ static void rr_wait_io_event(void)
 
     while (all_cpu_threads_idle() && replay_can_wait()) {
         rr_stop_kick_timer();
-        qemu_cond_wait_iothread(first_cpu->halt_cond);
+        qemu_cond_wait_bql(first_cpu->halt_cond);
     }
 
     rr_start_kick_timer();
@@ -188,7 +188,7 @@ static void *rr_cpu_thread_fn(void *arg)
     rcu_add_force_rcu_notifier(&force_rcu);
     tcg_register_thread();
 
-    qemu_mutex_lock_iothread();
+    bql_lock();
     qemu_thread_get_self(cpu->thread);
 
     cpu->thread_id = qemu_get_thread_id();
@@ -198,7 +198,7 @@ static void *rr_cpu_thread_fn(void *arg)
 
     /* wait for initial kick-off after machine start */
     while (first_cpu->stopped) {
-        qemu_cond_wait_iothread(first_cpu->halt_cond);
+        qemu_cond_wait_bql(first_cpu->halt_cond);
 
         /* process any pending work */
         CPU_FOREACH(cpu) {
@@ -218,9 +218,9 @@ static void *rr_cpu_thread_fn(void *arg)
         /* Only used for icount_enabled() */
         int64_t cpu_budget = 0;
 
-        qemu_mutex_unlock_iothread();
+        bql_unlock();
         replay_mutex_lock();
-        qemu_mutex_lock_iothread();
+        bql_lock();
 
         if (icount_enabled()) {
             int cpu_count = rr_cpu_count();
@@ -254,7 +254,7 @@ static void *rr_cpu_thread_fn(void *arg)
             if (cpu_can_run(cpu)) {
                 int r;
 
-                qemu_mutex_unlock_iothread();
+                bql_unlock();
                 if (icount_enabled()) {
                     icount_prepare_for_run(cpu, cpu_budget);
                 }
@@ -262,15 +262,15 @@ static void *rr_cpu_thread_fn(void *arg)
                 if (icount_enabled()) {
                     icount_process_data(cpu);
                 }
-                qemu_mutex_lock_iothread();
+                bql_lock();
 
                 if (r == EXCP_DEBUG) {
                     cpu_handle_guest_debug(cpu);
                     break;
                 } else if (r == EXCP_ATOMIC) {
-                    qemu_mutex_unlock_iothread();
+                    bql_unlock();
                     cpu_exec_step_atomic(cpu);
-                    qemu_mutex_lock_iothread();
+                    bql_lock();
                     break;
                 }
             } else if (cpu->stop) {
diff --git a/accel/tcg/tcg-accel-ops.c b/accel/tcg/tcg-accel-ops.c
index 1b57290..813065c 100644
--- a/accel/tcg/tcg-accel-ops.c
+++ b/accel/tcg/tcg-accel-ops.c
@@ -88,7 +88,7 @@ static void tcg_cpu_reset_hold(CPUState *cpu)
 /* mask must never be zero, except for A20 change call */
 void tcg_handle_interrupt(CPUState *cpu, int mask)
 {
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(bql_locked());
 
     cpu->interrupt_request |= mask;
 
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 79a88f5..1737bb3 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -649,7 +649,7 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr)
 
 void cpu_interrupt(CPUState *cpu, int mask)
 {
-    g_assert(qemu_mutex_iothread_locked());
+    g_assert(bql_locked());
     cpu->interrupt_request |= mask;
     qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
 }