qemu/main-loop: rename QEMU_IOTHREAD_LOCK_GUARD to BQL_LOCK_GUARD

The name "iothread" is overloaded. Use the term Big QEMU Lock (BQL)
instead, it is already widely used and unambiguous.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20240102153529.486531-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

hw/i386/kvm/xen_evtchn.c

@@ -1127,7 +1127,7 @@ int xen_evtchn_reset_op(struct evtchn_reset *reset)
         return -ESRCH;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     return xen_evtchn_soft_reset();
 }
 
@@ -1145,7 +1145,7 @@ int xen_evtchn_close_op(struct evtchn_close *close)
         return -EINVAL;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     qemu_mutex_lock(&s->port_lock);
 
     ret = close_port(s, close->port, &flush_kvm_routes);
@@ -1272,7 +1272,7 @@ int xen_evtchn_bind_pirq_op(struct evtchn_bind_pirq *pirq)
         return -EINVAL;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     if (s->pirq[pirq->pirq].port) {
         return -EBUSY;
@@ -1824,7 +1824,7 @@ int xen_physdev_map_pirq(struct physdev_map_pirq *map)
         return -ENOTSUP;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     QEMU_LOCK_GUARD(&s->port_lock);
 
     if (map->domid != DOMID_SELF && map->domid != xen_domid) {
@@ -1884,7 +1884,7 @@ int xen_physdev_unmap_pirq(struct physdev_unmap_pirq *unmap)
         return -EINVAL;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     qemu_mutex_lock(&s->port_lock);
 
     if (!pirq_inuse(s, pirq)) {
@@ -1924,7 +1924,7 @@ int xen_physdev_eoi_pirq(struct physdev_eoi *eoi)
         return -ENOTSUP;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     QEMU_LOCK_GUARD(&s->port_lock);
 
     if (!pirq_inuse(s, pirq)) {
@@ -1956,7 +1956,7 @@ int xen_physdev_query_pirq(struct physdev_irq_status_query *query)
         return -ENOTSUP;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     QEMU_LOCK_GUARD(&s->port_lock);
 
     if (!pirq_inuse(s, pirq)) {

hw/i386/kvm/xen_gnttab.c

@@ -176,7 +176,7 @@ int xen_gnttab_map_page(uint64_t idx, uint64_t gfn)
         return -EINVAL;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
     QEMU_LOCK_GUARD(&s->gnt_lock);
 
     xen_overlay_do_map_page(&s->gnt_aliases[idx], gpa);

hw/mips/mips_int.c

@@ -36,7 +36,7 @@ static void cpu_mips_irq_request(void *opaque, int irq, int level)
         return;
     }
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     if (level) {
         env->CP0_Cause |= 1 << (irq + CP0Ca_IP);

hw/ppc/ppc.c

@@ -47,7 +47,7 @@ void ppc_set_irq(PowerPCCPU *cpu, int irq, int level)
     unsigned int old_pending;
 
     /* We may already have the BQL if coming from the reset path */
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     old_pending = env->pending_interrupts;
 

include/qemu/main-loop.h

@@ -343,33 +343,32 @@ void bql_lock_impl(const char *file, int line);
 void bql_unlock(void);
 
 /**
- * QEMU_IOTHREAD_LOCK_GUARD
+ * BQL_LOCK_GUARD
  *
  * Wrap a block of code in a conditional bql_{lock,unlock}.
  */
-typedef struct IOThreadLockAuto IOThreadLockAuto;
+typedef struct BQLLockAuto BQLLockAuto;
 
-static inline IOThreadLockAuto *qemu_iothread_auto_lock(const char *file,
+static inline BQLLockAuto *bql_auto_lock(const char *file, int line)
-                                                        int line)
 {
     if (bql_locked()) {
         return NULL;
     }
     bql_lock_impl(file, line);
     /* Anything non-NULL causes the cleanup function to be called */
-    return (IOThreadLockAuto *)(uintptr_t)1;
+    return (BQLLockAuto *)(uintptr_t)1;
 }
 
-static inline void qemu_iothread_auto_unlock(IOThreadLockAuto *l)
+static inline void bql_auto_unlock(BQLLockAuto *l)
 {
     bql_unlock();
 }
 
-G_DEFINE_AUTOPTR_CLEANUP_FUNC(IOThreadLockAuto, qemu_iothread_auto_unlock)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(BQLLockAuto, bql_auto_unlock)
 
-#define QEMU_IOTHREAD_LOCK_GUARD() \
+#define BQL_LOCK_GUARD() \
-    g_autoptr(IOThreadLockAuto) _iothread_lock_auto __attribute__((unused)) \
+    g_autoptr(BQLLockAuto) _bql_lock_auto __attribute__((unused)) \
-        = qemu_iothread_auto_lock(__FILE__, __LINE__)
+        = bql_auto_lock(__FILE__, __LINE__)
 
 /*
  * qemu_cond_wait_iothread: Wait on condition for the main loop mutex

target/i386/kvm/xen-emu.c

@@ -581,7 +581,7 @@ static int xen_set_shared_info(uint64_t gfn)
     uint64_t gpa = gfn << TARGET_PAGE_BITS;
     int i, err;
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     /*
      * The xen_overlay device tells KVM about it too, since it had to

target/ppc/excp_helper.c

@@ -2222,7 +2222,7 @@ static int ppc_next_unmasked_interrupt(CPUPPCState *env)
 void ppc_maybe_interrupt(CPUPPCState *env)
 {
     CPUState *cs = env_cpu(env);
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     if (ppc_next_unmasked_interrupt(env)) {
         cpu_interrupt(cs, CPU_INTERRUPT_HARD);

target/ppc/helper_regs.c

@@ -244,7 +244,7 @@ void cpu_interrupt_exittb(CPUState *cs)
      * unless running with TCG.
      */
     if (tcg_enabled()) {
-        QEMU_IOTHREAD_LOCK_GUARD();
+        BQL_LOCK_GUARD();
         cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
     }
 }

target/riscv/cpu_helper.c

@@ -655,7 +655,7 @@ void riscv_cpu_interrupt(CPURISCVState *env)
     uint64_t gein, vsgein = 0, vstip = 0, irqf = 0;
     CPUState *cs = env_cpu(env);
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     if (env->virt_enabled) {
         gein = get_field(env->hstatus, HSTATUS_VGEIN);
@@ -681,7 +681,7 @@ uint64_t riscv_cpu_update_mip(CPURISCVState *env, uint64_t mask, uint64_t value)
     /* No need to update mip for VSTIP */
     mask = ((mask == MIP_VSTIP) && env->vstime_irq) ? 0 : mask;
 
-    QEMU_IOTHREAD_LOCK_GUARD();
+    BQL_LOCK_GUARD();
 
     env->mip = (env->mip & ~mask) | (value & mask);