![]() Now you should be able to boot/ into a -arm64.img type cloud image. ![]() Install QEMU and the EFI image for QEMU: $ sudo apt-get install qemu-system-arm qemu-efi 1.Create a VM-specific flash volume for storing NVRAM variables: $ cp /usr/share/AAVMF/AAVMF_CODE.fd flash1.img.Note: this requires Ubuntu 20.04 or greater Getting the bits It is possible to boot directly into Linux instead. I've chosen to describe a UEFI-based system here so I can make use of the kernel on the guest's disk image. on an x86 host) or, accelerated w/ KVM if you have an arm64 host. You can either do this fully emulated (e.g. QEMU 2.11.Ubuntu/arm64 can run inside the QEMU emulator. QEMU 2.11.0 monitor - type 'help' for more information Then, commands can be sent to the listening monitor via netcat or a similar utility: $ echo info\ kvm |nc -N 127.0.0.1 55555 If the output of the commands executed on the monitor need to be collected, a TCP session can be used instead: $ qemu-system-i386 -monitor tcp:127.0.0.1:55555,server,nowait $ _ # qemu sends the guest an ACPI shutdown signal ![]() This is fine as long as the output of commands can be discarded since the telnet session will probably close too quickly for visual feedback: $ echo system_powerdown |telnet 127.0.0.1 55555 Then, QEMU can be scripted by piping commands to telnet. One way is to have QEMU offer access to its monitor via telnet: $ qemu-system-i386 -monitor telnet:127.0.0.1:55555,server,nowait There are a couple options for redirecting the QEMU monitor. Someone might be able to chime in with a proper command for operating on TTYs, but I'll post a solution in the meantime involving the network. It doesn't store data it's just an arbitrary handle for programs to open communications. QEMU also permits -qmp in place of -monitor, providing a JSON-based interface that might be more robust for programmatic control, but I never tried it.Ī socket file on disk is always empty. To shut down the VM as you wanted, useful monitor commands are system_powerdown, which presses the on/off button of the imaginary machine so it can gracefully shut down, or quit, which quits QEMU immediately. To send a one-shot command to QEMU, echo it thru socat to the UNIX socket: $ echo "info status" | socat - unix-connect:qemu-monitor-socketįor cleaner output in a script, I also add | tail -lines= 2 | grep -v '^(qemu)' to filter out the first line and the (qemu) prompt lines: $ echo "info status" | socat - unix-connect:qemu-monitor-socket | tail -lines= 2 | grep -v '^(qemu)' The final parameter says to connect to the socket file created earlier. The couple of options echo=0,icanon=0 make keyboard interaction nicer here by preventing re-echoing of entered commands and enabling Tab completion and arrow keys for history. The first parameter - is a synonym for stdio, i.e., the console keyboard and output. What socat does is connect two arbitrary streams/sockets together. QEMU 2.8.1 monitor - type 'help' for more information You can use the socat utility (available from all good repositories) to connect to the socket to type commands to the QEMU monitor prompt: $ socat -,echo=0,icanon=0 unix-connect:qemu-monitor-socket The options server,nowait tell QEMU to listen for connections, but start the VM without waiting for a connection. You'll see this file created when QEMU starts. Qemu-monitor-socket here is not a keyword, but a host path and filename of your choice to represent the socket on disk. When you start QEMU, add the -monitor parameter as follows: $ qemu-system-i386 -monitor unix:qemu-monitor-socket,server,nowait It works well, although the method is very poorly documented. My preferred way to do this is to connect to the QEMU "monitor" via a UNIX socket.
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