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monitor: do not use mb_read/mb_set for suspend_cnt

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Clean up monitor_event to just use monitor_suspend/monitor_resume,
using mon->mux_out to protect against incorrect nesting (especially
on startup).

The only remaining case of reading suspend_cnt is in the can_read
callback, which is just advisory and can use qatomic_read.

As an extra benefit, mux_out is now simply protected by mon_lock.
Also, moving the prompt to the beginning of the main loop removes
it from the output in some error cases where QEMU does not actually
start successfully.  It is not a full fix and it would be nice to
also remove the monitor heading, but this is already a small (though
unintentional) improvement.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-03 13:32:13 +01:00
parent 4cb96b9742
commit 6ee7c82d0d
5 changed files with 39 additions and 38 deletions
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4
tests/qemu-iotests/051.out
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@ -74,7 +74,7 @@ QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node-name: 'fo
Testing: -device virtio-scsi -device scsi-hd
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) QEMU_PROG: -device scsi-hd: drive property not set
QEMU_PROG: -device scsi-hd: drive property not set
=== Overriding backing file ===
@ -134,7 +134,7 @@ QEMU X.Y.Z monitor - type 'help' for more information
Testing: -drive if=virtio
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) QEMU_PROG: -drive if=virtio: Device needs media, but drive is empty
QEMU_PROG: -drive if=virtio: Device needs media, but drive is empty
=== Attach to node in non-default iothread ===