[libvirt-users] Start domain with usable QMP connection?

[Osier Yang]

By the way, the patch of shortcut for HMP passthrough is very
recent.

commit 2169472ab6cac3bdb1f32578de2b608a61a1d703
Author: Jiri Denemark <jdenemar at redhat.com>
Date:   Wed Feb 2 16:37:10 2011 +0100

Make sure you have it supported.. ;-)

Regards
Osier
于 2011年02月11日 07:54, Bryan D. Payne 写道:
> Is there any way to get virsh / libvirt to create a domain such that I
> can later connect to it via QMP (without hacking the code)?
>
> The command line that libvirt creates for my current setup looks like this:
>
> /usr/local/bin/qemu-system-x86_64 -S -M pc-0.12 -enable-kvm -m 512
> -smp 1,sockets=1,cores=1,threads=1 -name winxpsp2 -uuid
> ab244939-c804-1aff-68b6-9324f174c3c8 -nodefconfig -nodefaults -chardev
> socket,id=monitor,path=/usr/local/var/lib/libvirt/qemu/winxpsp2.monitor,server,nowait
> -mon chardev=monitor,mode=control -rtc base=localtime -boot c -drive
> file=/var/lib/libvirt/images/winxpsp2.img,if=none,id=drive-ide0-0-0,format=raw
> -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0
> -drive file=/home/username/iso/en_winxp_pro_with_sp2.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw
> -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0
> -netdev tap,fd=16,id=hostnet0 -device
> rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:4d:1d:1b,bus=pci.0,addr=0x3
> -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb
> -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k en-us -vga std
> -device ES1370,id=sound0,bus=pci.0,addr=0x4 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
>
> The important pieces of this command line (I believe) are:
>
> -chardev socket,id=monitor,path=/usr/local/var/lib/libvirt/qemu/winxpsp2.monitor,server,nowait
> -mon chardev=monitor,mode=control
>
> However, I'm unable to connect using this path because -- I'm guessing
> -- libvirt has already connected.  As a test, I added some code to
> src/qemu/qemu_command.c to open a second chardev.  My new command line
> looks like this:
>
> /usr/local/bin/qemu-system-x86_64 -S -M pc-0.12 -enable-kvm -m 512
> -smp 1,sockets=1,cores=1,threads=1 -name winxpsp2 -uuid
> ab244939-c804-1aff-68b6-9324f174c3c8 -nodefconfig -nodefaults -chardev
> socket,id=monitor,path=/usr/local/var/lib/libvirt/qemu/winxpsp2.monitor,server,nowait
> -mon chardev=monitor,mode=control -chardev
> socket,id=qmpmonitor,path=/usr/local/var/lib/libvirt/qemu/winxpsp2.qmpmonitor,server,nowait
> -mon chardev=qmpmonitor,mode=control -rtc base=localtime -boot c
> -drive file=/var/lib/libvirt/images/winxpsp2.img,if=none,id=drive-ide0-0-0,format=raw
> -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0
> -drive file=/home/username/iso/en_winxp_pro_with_sp2.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw
> -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0
> -netdev tap,fd=15,id=hostnet0 -device
> rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:4d:1d:1b,bus=pci.0,addr=0x3
> -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb
> -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -k en-us -vga std
> -device ES1370,id=sound0,bus=pci.0,addr=0x4 -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
>
> Notice that there are now two chardevs:
>
> -chardev socket,id=monitor,path=/usr/local/var/lib/libvirt/qemu/winxpsp2.monitor,server,nowait
> -mon chardev=monitor,mode=control
>
> -chardev socket,id=qmpmonitor,path=/usr/local/var/lib/libvirt/qemu/winxpsp2.qmpmonitor,server,nowait
> -mon chardev=qmpmonitor,mode=control
>
> As expected, I am able to connect to this second chardev via QMP.  Is
> there anyway that I can enable such functionality in libvirt without
> hacking the code?
>
> Thanks,
> bryan
>
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