Re: qemu redirecting guest output in terminal
- Date: Sun, 28 Oct 2018 20:37:30 +0300
- From: Reco <recoverym4n@xxxxxxxxxxxx>
- Subject: Re: qemu redirecting guest output in terminal
On Sun, Oct 28, 2018 at 05:51:13PM +0100, john doe wrote:
> On 10/26/2018 4:44 PM, Reco wrote:
> > Nah, we don't do Windows here. Way too many quirks for my personal
> > taste.
> > What you can try is to replace stdio with telnet:
> > qemu -hda debian.img -m 1024 \
> > -chardev socket,id=tty0,port=5555,server,telnet \
> > -serial chardev:tty0 -nographic \
> > -kernel vmlinux -append 'console=ttyS0,115200n8' \
> > -initrd initrd.gz
> > Port 5555 is just an example, obviously.
> > And you'll need telnet, but since you're using Cygwin you should got it
> > covered.
> While trying the above command, I get an error probably because I didn't
> install the telnet package on Cygwin.
No, it was because I left out one argument that did not have a default
value. This should work (works for me at least):
qemu -hda debian.img -m 1024 \
-chardev socket,id=tty0,host=127.0.0.1,port=5555,server,telnet \
-serial chardev:tty0 -nographic \
-kernel vmlinux -append 'console=ttyS0,115200n8' \
If you're seeing something like:
QEMU waiting for connection on: disconnected:telnet:127.0.0.1:5555,server
that means it works, connect with telnet, or netcat, or whatever.
> Qemu supports using COM port and I have install com0com (1) but when
> using '-serial COM25' I get the following error:
> $ qemu-system-x86_64.exe -drive file=debian.img,format=raw -boot c -m
> 8192 -nographic -accel hax -machine q35 -serial COM25
> HAX is working and emulator runs in fast virt mode.
> QEMU 3.0.0 monitor - type 'help' for more information
> (qemu) C:\Program Files\qemu\qemu-system-x86_64.exe: -serial COM25:
> Failed CreateFile (2)
> C:\Program Files\qemu\qemu-system-x86_64.exe: -serial COM25: could not
> connect serial device to character backend 'COM25'
> I guess I'm missing something in the above command?
-serial [dev] means:
Redirect the virtual serial port to host character device dev.
As I wrote earlier, we don't do Windows here, so I cannot produce a
Windows equivalent of /dev/com25.
> >> Using Cygwin the output is not mest up but during the installation I'm
> >> stuck at:
> >> "No disk drive was detected. If you know the name of the driver needed
> >> by your
> >> disk drive, you can select it from the list.
> >> Driver needed for your disk drive:
> >> 1: continue with no disk drive [*], 46: loop,"
> >> Should I select the default option (1) or what should I do?
> > No, that means that whatever you did with Cygwin denied QEMU read-write
> > access to a file that represents a disk drive. An installation is
> > impossible.
> Yep, removing 'debian.img' an recreating it by doing the below command
> did it:
> $ qemu-img create debian.img 25G