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authorChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:35:14 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-06-01 21:35:14 +0200
commit3e4c5a6261770bced301b5e74233e7866166ea5b (patch)
tree9379fddaba693ef8a045da06efee8529baa5f6f4 /gitlab/issues_text/target_i386/host_missing/accel_missing/2393
parente5634e2806195bee44407853c4bf8776f7abfa4f (diff)
downloadqemu-analysis-3e4c5a6261770bced301b5e74233e7866166ea5b.tar.gz
qemu-analysis-3e4c5a6261770bced301b5e74233e7866166ea5b.zip
clean up repository
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-qemu: seabios hangs for 10~15 sec at boot with `-machine q35`
-Description of problem:
-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)
-Steps to reproduce:
-1. qemu-system-x86_64 -machine q35
-2. wait about 10-15sec before boot continues
-Additional information:
-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