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Re: [Qemu-discuss] How to run qemu with -nographic and -monitor but stil

From: Ciro Santilli
Subject: Re: [Qemu-discuss] How to run qemu with -nographic and -monitor but still be able to send Ctrl+C to the guest?
Date: Tue, 10 Apr 2018 15:06:02 +0100

On Tue, Apr 10, 2018 at 6:27 AM, Thomas Huth <address@hidden> wrote:
> On 10.04.2018 02:10, Ciro Santilli wrote:
>> On Mon, Apr 9, 2018 at 1:33 PM, Thomas Huth <address@hidden> wrote:
>>> On 08.04.2018 12:39, Ciro Santilli wrote:
> [...]
>>>> Is there a way to both keep my `Ctrl-C` and `-monitor` working with
>>>> `-nographic`?
>>>> Full QEMU command:
>>>>     qemu-system-x86_64 -append 'root=/dev/vda console=ttyS0' -kernel
>>>> 'bzImage' -drive file='rootfs.ext2.qcow2,if=virtio,format=qcow2'
>>>> -nographic -monitor telnet::45454,server,nowait
>>> I think you need a chardev with signal=off for that. Try something like:
>>> qemu-system-x86_64  -nographic -monitor telnet::45454,server,nowait \
>>>   -chardev stdio,id=s1,signal=off \
>>>   -serial none -device isa-serial,chardev=s1
>> I tried that and Ctrl+C does get passed to the guest as I wanted.
>> However, when I do this, I noticed that I can't pass Ctrl+A X to
>> easily quit QEMU (I know I can do quit on the monitor).
>> Is there a way to also keep Ctrl+A X working, in addition to having
>> Ctrl+C passed to the guest?
> Yes, you need to multiplex the stdio output with a HMP monitor:
> qemu-system-x86_64  -nographic -monitor telnet::45454,server,nowait \
>      -chardev stdio,id=s1,signal=off,mux=on -serial none \
>      -device isa-serial,chardev=s1 -mon chardev=s1,mode=readline

Thanks, that worked perfectly!

Do you know how to do the same thing for `qemu-system-arm -M
versatilepb` or `qemu-system-aarch64 -M virt`?

If I try to pass the option `-device isa-serial,chardev=s1` it QEMU
fails to start with:

    -device isa-serial,chardev=s1: No 'ISA' bus found for device 'isa-serial'

>   Thomas

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