(solved) VirtIO Serial Issue

[Bigun]

I'm trying to get qemu-guest-agent in my Gentoo VM to talk with the Proxmox Hypervisor, and I'm having trouble.

I've followed this guide to complete the virtual machine kernel configuration, I've enabled the qemu guest agent option in proxmox on the VM, installed and started qemu-guest-agent service, and there's no communication between the VM and Proxmox.

In the VM I see what I think is the correct needed hardware via lspci:

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00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Device 1234:1111 (rev 02)
00:03.0 Unclassified device [00ff]: Red Hat, Inc. Virtio memory balloon
00:05.0 SCSI storage controller: Red Hat, Inc. Virtio SCSI
00:08.0 Communication controller: Red Hat, Inc. Virtio console
00:12.0 Ethernet controller: Red Hat, Inc. Virtio network device
00:1e.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
00:1f.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge

However the needed socket in the dev directory is missing:

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# ls -la /dev/virtio-ports/org.qemu.guest_agent.0
ls: cannot access '/dev/virtio-ports/org.qemu.guest_agent.0': No such file or directory

Any help is appreciated.

[quilosaq]

That device must be configured externally by hypervisor. Maybe you forgot enabled it:

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qm set VMID --agent 1

https://pve.proxmox.com/wiki/Qemu-guest ... stallation

[Bigun]

I've checked no less that 15 times, QEMU Guest Agent is enabled on the hypervisor.

Just for completion sake, I ran the command as well. No change.

I installed Ubuntu and it worked immediately out of the box, going to copy the related kernel options to see if it gets it working.

[Bigun]

No, it didn't work. The virtio-ports dev directory is missing and the /dev/vport1p1 isn't there either.

Judging from the Ubuntu install and lspci -k, it seems the communications controller virtual device uses the virtio-pci driver, which is 100% present in my Gentoo install.

From Gentoo:

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# lspci -k
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
        Subsystem: Red Hat, Inc. Qemu virtual machine
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
        Subsystem: Red Hat, Inc. Qemu virtual machine
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
        Subsystem: Red Hat, Inc. Qemu virtual machine
        Kernel driver in use: ata_piix
00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
        Subsystem: Red Hat, Inc. QEMU Virtual Machine
        Kernel driver in use: uhci_hcd
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
        Subsystem: Red Hat, Inc. Qemu virtual machine
00:02.0 VGA compatible controller: Device 1234:1111 (rev 02)
        Subsystem: Red Hat, Inc. Device 1100
00:03.0 Unclassified device [00ff]: Red Hat, Inc. Virtio memory balloon
        Subsystem: Red Hat, Inc. Virtio memory balloon
        Kernel driver in use: virtio-pci
00:05.0 SCSI storage controller: Red Hat, Inc. Virtio SCSI
        Subsystem: Red Hat, Inc. Virtio SCSI
        Kernel driver in use: virtio-pci
00:08.0 Communication controller: Red Hat, Inc. Virtio console
        Subsystem: Red Hat, Inc. Virtio console
        Kernel driver in use: virtio-pci
00:12.0 Ethernet controller: Red Hat, Inc. Virtio network device
        Subsystem: Red Hat, Inc. Virtio network device
        Kernel driver in use: virtio-pci
00:1e.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
00:1f.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
01:1d.0 Unclassified device [00ff]: Red Hat, Inc. Virtio RNG
        Subsystem: Red Hat, Inc. Virtio RNG
        Kernel driver in use: virtio-pci

Except for the order of devices, the Ubuntu lspci -k looks near exact to my Gentoo install.

[quilosaq]

Try enabling Virtio console (CONFIG_VIRTIO_CONSOLE) in Linux sources:

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Device Drivers
  Character devices
    Virtio console

[Bigun]

Try enabling Virtio console (CONFIG_VIRTIO_CONSOLE) in Linux sources:

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Device Drivers
  Character devices
    Virtio console

That did it, thank you.