boot failure upgrading to 25.03.b.20250306.0140 i

stephenw10

Hmm, yes I probably did end up with Q35+BIOS.

Do you see the PCI devices shown as (modern) in the boot logs?

jimp

I don't see any mention of modern in my logs, they still show as VirtIO (legacy) even on recently created VMs.

In the info qtree of all the VMs it doesn't seem to express a preference either way:

                disable-legacy = "off"
                disable-modern = false

Same on every device

netblues

@jimp said in boot failure upgrading to 25.03.b.20250306.0140 i:

Were you using an odd mix like q35+BIOS instead of q35+UEFI?

Everything was/is q35 + bios, but the issue was that after booting couldn't load disk voiume.
Just changing driver to scsci /or sata from virtio would allow startup normaly till network cards not being detected at later stage.

This can't be a uefi thing IMHO.

jimp

@netblues said in boot failure upgrading to 25.03.b.20250306.0140 i:

@jimp said in boot failure upgrading to 25.03.b.20250306.0140 i:

Were you using an odd mix like q35+BIOS instead of q35+UEFI?

Everything was/is q35 + bios, but the issue was that after booting couldn't load disk voiume.
Just changing driver to scsci /or sata from virtio would allow startup normaly till network cards not being detected at later stage.

This can't be a uefi thing IMHO.

Declaring that without trying it seems hasty. There isn't much of a compelling reason to run q35+BIOS so it's probably a much less tested combination comparatively.

It absolutely can make a difference in how the system probes devices and boots.

netblues

@jimp

Tried, but it will take more than changing bios settings. Most probably a reinstall

jimp

I setup a fresh VM as q35+BIOS and it worked fine and showed legacy virtio devices by default.

I forced modern devices with qm set 157 --args "-global virtio-net-pci.disable-legacy=on -global virtio-blk-pci.disable-legacy=on" and it still booted fine and worked on the network, dmesg output shows modern for the disk/block device and network devices.

This is on a fresh 2.8.0 VM but it should be using the same base OS version as 25.03 builds.

That's all on Proxmox though so it's possible KVM is doing something differently, maybe it's a newer version of KVM/qemu or something else changed.

stephenw10

Yeah it feels like whatever is upstream of those PCI devices fails to be detected and hence anything downstream isn't seen at all. I did try setting -global virtio-pci.disable-legacy=on, which should be valid, but it fails to boot entirely.

jimp

I tried that and hit the same failure, hence my limiting it to NICs and disk devices, which did work.

One thing I did read when looking into this is that it may make a difference if the root device is PCI vs PCIe but I didn't look into how to check/change that on Proxmox yet.

Though at least I did confirm that the modern NICs and block devices do work on their own, so the original stated issue is somewhat of a red herring and the workaround may have allowed it to function, but not for the reason that was thought.

stephenw10

Yup, that's exactly what I did. Good to get confirmation at least.

Maff

good Morning, i am currently running 25.03-BETA (amd64)
built on Tue Feb 4. and when ever i try to upgrade to the latest i get this failure but i am not using any virtual machines, is a minisfourm ms-01, onboard nics and nvme drive

any pointers i could look for?

Maff

@Maff

fresh install cleared it up