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id = 2393
title = "qemu: seabios hangs for 10~15 sec at boot with `-machine q35`"
state = "closed"
created_at = "2024-06-16T16:31:17.808Z"
closed_at = "2024-09-19T17:45:06.501Z"
labels = ["target: i386"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2393"
host-os = "Gentoo Linux"
host-arch = "x86_64"
qemu-version = "QEMU emulator version 9.0.1"
guest-os = "Gentoo Linux"
guest-arch = "x86_64"
description = """Whenever i'm starting a virtual machine i'm having the issue that seabios (or at least that's what i see) hangs for about 10~15 seconds. In that time on of the cpu cores runs at 100%.
This issue isn't new actually. I'm having this already for quite some time and a i think for at least the last 2 major versions. I haven't looked into it since it isn't a big issue, just annoying.
Today i've looked into it and as far as i can see, this issue is always present with the flag `-machine q35`, which is the default for my vm's. If i set it to `-machine pc`, booting works as expected. However i also found a "workaround" where the vm's starting immediately (with `-machine q35` enabled), which is by simply adding a iso image to the command line (via -cdrom) - even though it's not used.
This means:
- 15 sec delay: qemu-system-x86_64 -machine q35
- works immediately: qemu-system-x86_64 -machine q35 -cdrom /mnt/data/vm/isos/openSUSE-Tumbleweed-DVD-x86_64-Snapshot20230303-Media.iso
Please note that most of my vm's usually start booting from a kernel image directly (-kernel /mnt/data/vm/kernel/gentoo-latest -initrd /mnt/data/vm/kernel/initrd-v5.cpio.gz) - but even in that case settings a cdrom (image) would fix the issue.
Also, the image needs to be a valid one, if i set an empty file or /dev/null the issue would remain.
Further more, i have the same issue on a second computer. This also runs on Gentoo Linux and is also a AMD Ryzen. (in case this is relevant)"""
reproduce = """1. qemu-system-x86_64 -machine q35
2. wait about 10-15sec before boot continues"""
additional = """I was thinking to add an Screenshot of the hanging boot process, but the only text written there is:
SeaBIOS (version 1.16.0-20220807_005459-localhost)
with a blinking cursor below"""
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