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serial: check if backed by a physical serial port at realize time

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Right now, s->poll_msl may linger at "0" value for an arbitrarily long
time, until serial_update_msl is called for the first time.  This is
unnecessary, and will lead to the s->poll_msl field being unnecessarily
migrated.

We can call serial_update_msl immediately at realize time (via
serial_reset) and be done with it.  The memory-mapped UART was already
doing that, but not the ISA and PCI variants.

Regarding the delta bits, be consistent with what serial_reset does when
the serial port is not backed by a physical serial port, and always clear
them at reset time.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-08-26 12:16:08 +02:00
parent 4df7961faa
commit a30cf8760f
1 changed files with 3 additions and 2 deletions
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5
hw/char/serial.c
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@ -815,6 +815,9 @@ static void serial_reset(void *opaque)
s->thr_ipending = 0;
s->last_break_enable = 0;
qemu_irq_lower(s->irq);
serial_update_msl(s);
s->msr &= ~UART_MSR_ANY_DELTA;
}
void serial_realize_core(SerialState *s, Error **errp)
@ -945,7 +948,5 @@ SerialState *serial_mm_init(MemoryRegion *address_space,
memory_region_init_io(&s->io, NULL, &serial_mm_ops[end], s,
"serial", 8 << it_shift);
memory_region_add_subregion(address_space, base, &s->io);
serial_update_msl(s);
return s;
}