[SOLVED] KVM configured, but not available issue

JayB21

New Member
Apr 12, 2025
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New to Proxmox but I've read every post on this issue I can find here and only have a few clues

Baremetal system:
Gigabyte B550m with Ryzen 9 5900x 32gb ram 1tb nvme x 2

SVM -is- enabled
IOMMU was on Auto but I switched it to Enabled

New Install of 8.4.1 with all default settings (I think)

All VMs create fine but fail on start with the TASK ERROR: KVM virtualisation configured, but not available.

VMs work when KVM hardware Virt is disabled but performance is a dog (as is apparently expected from reading here)

Some debugging things I've tried as suggested in other threads

lsmod | grep kvm returns nothing
grep flags /proc/cpuinfo | tail -n 1 returns no mention of SVM
cat /sys/module/kvm_intel/parameters/nested returns no such file or directory

Which leads me to think that...well...the KVM is not available.

But I can't find anything in the threads I've read as to why.

Ideas? Did I somehow bork the install and should just reinstall? (not in production so not an issue if needed)

TIA

-JB
 
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Did a clean install. No go. Updated the bios (flailing at this point), did a clean install and still no go.
 
OK. After flashing the BIOS I forgot to go back in and turn on SVM (it was on on all previous attempts) and after doing that with the latest BIOS, I no longer get the error.

So for future folks.

If you are running into the TASK ERROR: KVM virtualisation configured, but not available message when trying to start any VM. Check to make sure you have the latest BIOS update.

For me updating my Gigabyte B550M K (rev 1.1) board from FB to FEh fixed the issue. (after remembering to reenable SVM after the update)
 
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OK. After flashing the BIOS I forgot to go back in and turn on SVM (it was on on all previous attempts) and after doing that with the latest BIOS, I no longer get the error.

So for future folks.

If you are running into the TASK ERROR: KVM virtualisation configured, but not available message when trying to start any VM. Check to make sure you have the latest BIOS update.

For me updating my Gigabyte B550M K (rev 1.1) board from FB to FEh fixed the issue. (after remembering to reenable SVM after the update)
wow this must be exactly my issue. I have that board and having that problem even though I turned off TPM as well. hate bios upgrades, bricked a number in my day :(

UPDATE: [UNSOLVED] - Flashed bios to latest and /sbin/kvm-ok says ok (enabled) and /dev/tpm* doesnt exist (turned TPM off). still getting the error. Baffled.


Code:
proxmox-ve: 9.1.0 (running kernel: 6.17.4-2-pve)
pve-manager: 9.1.4 (running version: 9.1.4/5ac30304265fbd8e)
proxmox-kernel-helper: 9.0.4
proxmox-kernel-6.17.4-2-pve-signed: 6.17.4-2
proxmox-kernel-6.17: 6.17.4-2
proxmox-kernel-6.17.2-1-pve-signed: 6.17.2-1
amd64-microcode: 3.20250311.1
ceph-fuse: 19.2.3-pve2
corosync: 3.1.9-pve2
criu: 4.1.1-1
frr-pythontools: 10.4.1-1+pve1
ifupdown2: 3.3.0-1+pmx11
ksm-control-daemon: 1.5-1
libjs-extjs: 7.0.0-5
libproxmox-acme-perl: 1.7.0
libproxmox-backup-qemu0: 2.0.1
libproxmox-rs-perl: 0.4.1
libpve-access-control: 9.0.5
libpve-apiclient-perl: 3.4.2
libpve-cluster-api-perl: 9.0.7
libpve-cluster-perl: 9.0.7
libpve-common-perl: 9.1.3
libpve-guest-common-perl: 6.0.2
libpve-http-server-perl: 6.0.5
libpve-network-perl: 1.2.4
libpve-rs-perl: 0.11.4
libpve-storage-perl: 9.1.0
libspice-server1: 0.15.2-1+b1
lvm2: 2.03.31-2+pmx1
lxc-pve: 6.0.5-3
lxcfs: 6.0.4-pve1
novnc-pve: 1.6.0-3
proxmox-backup-client: 4.1.1-1
proxmox-backup-file-restore: 4.1.1-1
proxmox-backup-restore-image: 1.0.0
proxmox-firewall: 1.2.1
proxmox-kernel-helper: 9.0.4
proxmox-mail-forward: 1.0.2
proxmox-mini-journalreader: 1.6
proxmox-offline-mirror-helper: 0.7.3
proxmox-widget-toolkit: 5.1.5
pve-cluster: 9.0.7
pve-container: 6.0.18
pve-docs: 9.1.2
pve-edk2-firmware: 4.2025.05-2
pve-esxi-import-tools: 1.0.1
pve-firewall: 6.0.4
pve-firmware: 3.17-2
pve-ha-manager: 5.1.0
pve-i18n: 3.6.6
pve-qemu-kvm: 10.1.2-5
pve-xtermjs: 5.5.0-3
qemu-server: 9.1.3
smartmontools: 7.4-pve1
spiceterm: 3.4.1
swtpm: 0.8.0+pve3
vncterm: 1.9.1
zfsutils-linux: 2.3.4-pve1
 
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