Qemu boot iso iso#

I/O size (minimum/optimal): 512 bytes / 512 bytesĭevice Boot Start End Sectors Size Id Type Sector size (logical/physical): 512 bytes / 512 bytes This is Ubuntu 15.10, running: QEMU emulator version 2.3.0 (Debian 1:2.3+dfsg-5ubuntu9.3), Copyright (c) 2003-2008 Fabrice Bellard How do I properly boot such a raw image in QEMU? The bus=9 argument that -drive should accept is either interpreted as a filename, or completely ignored. $ qemu-system-x86_64 -drive format=raw file=x86-64.img bus=9 Qemu-system-x86_64: -drive bus=9: Could not open 'format=raw': No such file or directory qemu-system-i386 -m 1024 -boot d -enable-kvm -smp 3 -net nic -net user -hda testing-image.img. That fails (I think) because my boot device is on /dev/sda, bus 0, so one of the following should work according to QEMU's man page (but doesn't): $ qemu-system-x86_64 -drive bus=9 format=raw file=x86-64.img Qemu-system-x86_64: -drive format=raw: drive with bus=0, unit=0 (index=0) exists I am able to get as far as the boot menu, but attempting to boot into the installer leaves me with a blinking cursor.

Qemu boot iso iso#

The raw command line argument is, as far as I can tell, meant to be passed like this: $ qemu-system-x86_64 -drive format=raw file=x86-64.img Attempting to boot from a Live Linux Mint 18.4 (圆4) ISO using QEMU under macOS Catalina (with patches to use hvf as hypervisor in place of kvm).

(probably because PilOS wants to write to block 0 but can't) The emulator loads, but PilOS crashes, which means I did something wrong: Specify the 'raw' format explicitly to remove the restrictions. That gives a message: WARNING: Image format was not specified for 'x86-64.img' and probing guessed raw.Īutomatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted. launchpad.I have a disk image file from here that page says I can boot this image with QEMU and the following command: $ qemu-system-x86_64 -m 4096 -ctrl-grab -no-reboot x86-64.img Meanwhile, a workaround for this is to attach the device as a virtio-scsi-device, as shown here: Should we even be supporting this in the cdrom build, or should we be building an hd-media image for arm64, and does that somehow need to be integrate on the server ISO? How does this work, say, for x86 in the case where you dd an ISO to a usb stick? I'm not sure what the correct way to fix this is.

It is arguably a QEMU bug that this is different on arm64 and, perhaps, -cdrom on arm64 should be changed to emulate an actual CDROM (like can be done w/ a virtio- scsi-device), but I haven't looked into any history pros/cons there. I suspect that -cdrom on for qemu-system-x86 actually emulates a cdrom in the guest instead of a disk, so this isn't an issue for QEMU installs on x86. But, virtio-blk devices do not have this attribute. Though this will allow the block device to appear in the installer environment, it is not sufficient.Ĭdrom-detect calls 'list-devices cd' to scan for available CDs, which in turn calls 'udevadm info' on each device to look for ID_CDROM= attributes. It is in the block-modules udeb, so we could easily add it. One reason for this is that the virtio-blk module is missing from the installer. This appears to be because the -cdrom parameter in QEMU emulates what looks to be a disk to the VM (virtio block device), and not a CD-ROM.

While the installer will boot in the QEMU virt model when an Ubuntu Server ISO is attached via QEMU's -cdrom parameter, the installer will fail at the 'Detect and mount CD-ROM' step.