Erik Rull wrote:
Hi all,
I've tested two kvm versions 77 and 88, both with the same behaviour:
I add a serial device with -serial /dev/ttyS0 to my guest and launched
HyperTerm on my Windows Guest.
Additionally I plugged in a loopback plug on the serial connector that
just routes back the data send back to the receive line (TXD -> RXD).
When I enter characters on the Hyperterm all characters are displayed
except the last one that was sent.
When I plug in a real serial device and request its status via Hyperterm
I get only back the first 16 chars (I expect 50) when I send an
additional dummy character (sizeof: 16550 FIFO buffer). On my normal
Windows PC it works as expected - so it seems to be an issue with kvm.
In the linux host, I don't see any changes in /proc/interrupts, the
driver is opened and exclusively on this interrupt line.
Within the host the serial line works without any problems, and there,
the interrupt counts increase during normal operation with a software
that runs on the host and that uses this serial line.
What must I do to bring the serial line to real life with a complete
communication without any data lost caused by missing interrupts? At the
moment this is a key issue that has to be solved to continue my work
with kvm.
Any Ideas? I also tested other IRQ lines and other ttyS* on the system -
same behaviour.
Thanks in advance,
Erik
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fixed, apic on host side was disabled, kvm / qemu seems to need it.
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