Anybody here using QEMU? What is your use case?
VFIO! I play videogames and use Lightroom. It's rock solid (at least, with my usage pattern), however, v4.0.0 hangs on boot, so I use v3.1.0.
QEMU v4.0.0 released
151–160 of 168 posts
Re: QEMU v4.0.0 released
#152Anybody here using QEMU? What is your use case?
I have a library that needs to target, among other platforms, big endian MIPS. It does a lot of endianness sensitive stuff but all the CI workers are naturally little endian, so I run the testsuite through qemu-user simulating a MIPS system.
Re: QEMU v4.0.0 released
#153Earlier quoted context omitted.
I'm using it in conjunction with PCI passthrough instead of dual boot. I've been running Windows 10 for more than a year now and played all kinds of AAA titles successfully. The performance-loss seems minimal. Recently I managed to get a second GPU and spin up another VM, so now me and my partner can play on the same machine, heaving each a keyboard, mouse and screen.
Do you have any hints on how to set up a similar system? Links, guides, gotchas, whatnot? I've seen someone mention this setup before (perhaps it was you?) and I'm sure I'm not the only one interested in running something similar.
An overall good introduction/guide is: https://github.com/saveriomiroddi/vga-passthrough.
The most complete guide is probably the Arch Linux one: https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVM....
Re: QEMU v4.0.0 released
#154Earlier quoted context omitted.
I'm using it in conjunction with PCI passthrough instead of dual boot. I've been running Windows 10 for more than a year now and played all kinds of AAA titles successfully. The performance-loss seems minimal. Recently I managed to get a second GPU and spin up another VM, so now me and my partner can play on the same machine, heaving each a keyboard, mouse and screen.
Do you have any hints on how to set up a similar system? Links, guides, gotchas, whatnot? I've seen someone mention this setup before (perhaps it was you?) and I'm sure I'm not the only one interested in running something similar.
I posted about this on my blog here: https://1125.io/#/2019-01-21_21:58_Playing_within_a_Windows_...
Also I recently discovered some very in-depth blog posts here: https://heiko-sieger.info/iommu-groups-what-you-need-to-cons...
Another whole website about this topic (no joke): https://passthroughpo.st/
Re: QEMU v4.0.0 released
#155Last week, I intended to replace VirtualBox with QEMU for my personal use. The spartiate documentation made it really hard. I lack the competence to seriously contribute. The official documentation just explains the numerous parameters. It also points to tutorials (wikibook, etc), which unfortunately are very basic and out of sync. Even Arch Linux does not provide a good documentation (lack of clarity, some obsolete…
I have not used it, but Drew Devault had a post explaining how to get started with Qemu : https://drewdevault.com/2018/09/10/Getting-started-with-qemu...
> There’s really no excuse to be using any other hypervisor [1]. They’re all dogshit compared to qemu.
> [1] Especially VirtualBox. If you use VirtualBox after reading this article you make poor life choices and are an embarrassment to us all.
Well I'm convinced! What a well-presented article!
Appropriate Futurama quote: "Remember when I told you about always ending your stories a sentence earlier?".
Drew was doing well until he ended with this unnecessary condescending and hostile conclusion (and if you think it's funny, note that "the failure mode of smartass is asshole"). It's a trend of his. He's got interesting and informed things to say, but it's hard to really take him seriously because of this.
Re: QEMU v4.0.0 released
#156LTT [1] did a video recently about running macOS on a Linux host using QEMU. Anyone here tried that? If so, what's the experience like? Thanks [1]: https://www.youtube.com/watch?v=ATnpEOo3GJA
I am building a VFIO build this weekend. one of the goals is to power a macOS VM for work. if I remember I will update you on my experience. I had success getting macOS running on QEMU with my existing PC, but its performance suffered without a dedicated GPU and CPU pinning, which my new build will be configured to handle
Thank you, hope your build goes well!
Re: QEMU v4.0.0 released
#157Earlier quoted context omitted.
Launching QEMU directly is not merely "tricky", but incredibly inefficient and ineffective once you need something that's beyond bare minimal. E.g. here is a minimal QEMU command-line that gives you access to a serial console in the guest: `qemu-system-x86_64 -display none -no-user-config -nodefaults -m 2048 -device virtio-scsi-pci,id=scsi -device virtio-serial-pci -serial stdio -drive file=/export/cirros.qcow2,forma…
> like running the QEMU process as an unprivileged user, Anyone can run your example "qemu-system-x86_64 -display none -no-user-config -nodefaults -m 2048 -device virtio-scsi-pci,id=scsi -device virtio-serial-pci -serial stdio -drive file=/export/cirros.qcow2,format=qcow2,if=virtio" from the command line/bash, as non-root user, yet libvirt which requires root to install, and is expecting root to configure it, is bett…
Hear, hear. QEMU is excellent software, and I don't find that libvirt adds any value to its use.
Instead, one of the more annoying things I have ever done was foolishly installing libvirt and having it do all kinds of whackiness to a previously excellent QEMU set-up. I still cannot figure out where it managed to change all QEMU invocations to be VNC-based.
Re: QEMU v4.0.0 released
#158Anybody here using QEMU? What is your use case?
I used QEMU for VFIO, GPU passthrough to a Win 10 guest for games. It worked really well. I passed an nvidia card, an ssd with the os/programs, and an hdd data disk from a Linux host (Gentoo).
Setting it up was somewhat difficult. When I did it there weren't many good guides for just exactly my situation, so I had to use many, many different resources to get it running. Based on some of the links others have posted here, there seems to be more out there on it now.
This was my last working startup script. I no longer recall why or even if any of these options were necessary or beneficial. At the time, it was just what worked. (Dual monitor, separate video cards for host and guest, L-CTRL+R-CTRL to pass mouse/keyboard control back and forth.) I haven't used this in quite a while, so I can't say if all of these options are still legit anymore.
#!/bin/bash
cp /usr/share/edk2-ovmf/OVMF_VARS.fd /tmp/my_vars.fd
qemu-system-x86_64 \
-enable-kvm \
-m 16G \
-cpu qemu64,hv_vendor_id=whatever,kvm=off,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time,smep=off \
-smp cores=8,threads=1,sockets=1 \
-machine q35,type=pc -vga std -display gtk \
-drive if=pflash,format=raw,readonly,file=/usr/share/edk2-ovmf/OVMF_CODE.fd \
-drive if=pflash,format=raw,file=/tmp/my_vars.fd \
-drive file=/dev/disk/by-id/ata-Samsung_SSD_860_EVO_250GB_XXXXXXXXXXXXXXX,format=raw,if=virtio \
-drive file=/dev/disk/by-id/ata-ST3000DM001-XXXXXXXXXXXXXXX,format=raw,if=virtio \
-boot order=d \
-object input-linux,id=kbd,evdev=/dev/input/by-id/usb-XXXXXXXXXXXXX_USB_Keyboard-event-kbd,grab_all=yes \
-object input-linux,id=mouse,evdev=/dev/input/by-id/usb-XXXXXXXXXXXXXXXX-event-mouse \
-device virtio-mouse-pci \
-device virtio-keyboard-pci \
-netdev user,id=user.0 -device e1000,netdev=user.0 \
&Re: QEMU v4.0.0 released
#159Earlier quoted context omitted.
Launching QEMU directly is not merely "tricky", but incredibly inefficient and ineffective once you need something that's beyond bare minimal. E.g. here is a minimal QEMU command-line that gives you access to a serial console in the guest: `qemu-system-x86_64 -display none -no-user-config -nodefaults -m 2048 -device virtio-scsi-pci,id=scsi -device virtio-serial-pci -serial stdio -drive file=/export/cirros.qcow2,forma…
There's a lot to be said for running qemu from the command line, vs the complexity and opaqueness of libvirt. For example you can put the invocation in a script and check it into version control, and it will work on anyone's Linux box. You can easily debug the config and be suire about what options qemu was given. Yes, there may be many switches in the invocation, but at least they are in one place, the invocation sy…
Sometimes I feel like all I do is plug Nix.
But NixOS has a neat feature where any (?) NixOS configuration can trivially instead be built as a "vm", which will assemble an initrd for the described system along with a script which will run a tailored qemu invocation to launch the system, leaving a qcow2 file of any changes you make to the filesystem in your cwd. Makes the whole thing extremely usable, and is done in a very extensible way.
Re: QEMU v4.0.0 released
#160Earlier quoted context omitted.
Mainly playing with old operating systems, I'm a retrocomputing enthusiast. While years ago I would mainly use Virtual PC (I do miss its great GUI) and VMWare (and rarely bochs), qemu improved a lot and has (somewhat decent) support for so many more architectures. You can run Solaris for SPARC and Mac Os 9, for example.
"Solaris for SPARC" Link?
https://astr0baby.wordpress.com/2018/09/22/running-solaris-2...
Or do you mean a copy of the ISO? For that I'd try archive.org or winworldpc