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system/cpus: rename qemu_mutex_lock_iothread() to bql_lock()

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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 bql_lock(void)
- void bql_unlock(void)
- bool 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@redhat.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Fabiano Rosas <farosas@suse.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Peter Xu <peterx@redhat.com>
Acked-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Acked-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20240102153529.486531-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2024-01-02 10:35:25 -05:00
parent 897a06c6d7
commit 195801d700
95 changed files with 529 additions and 529 deletions
Download patch file Download diff file Expand all files Collapse all files

8
target/arm/hvf/hvf.c
View file

@ -1721,9 +1721,9 @@ static void hvf_wait_for_ipi(CPUState *cpu, struct timespec *ts)
* sleeping.
*/
qatomic_set_mb(&cpu->thread_kicked, false);
qemu_mutex_unlock_iothread();
bql_unlock();
pselect(0, 0, 0, 0, ts, &cpu->accel->unblock_ipi_mask);
qemu_mutex_lock_iothread();
bql_lock();
}
static void hvf_wfi(CPUState *cpu)
@ -1824,7 +1824,7 @@ int hvf_vcpu_exec(CPUState *cpu)
flush_cpu_state(cpu);
qemu_mutex_unlock_iothread();
bql_unlock();
assert_hvf_ok(hv_vcpu_run(cpu->accel->fd));
/* handle VMEXIT */
@ -1833,7 +1833,7 @@ int hvf_vcpu_exec(CPUState *cpu)
uint32_t ec = syn_get_ec(syndrome);
ret = 0;
qemu_mutex_lock_iothread();
bql_lock();
switch (exit_reason) {
case HV_EXIT_REASON_EXCEPTION:
/* This is the main one, handle below. */