I decided to try out virt-manager as a virtualization solution - it would be nice to have VMs without out-of-tree kernel modules My host OS is Arch Linux, my guest: Linux Mint 18.2 Cinnamon.
xserver-xorg-video-qxl was already installed out of the box. Besides, I installed spice-vdagent. Still, Cinnamon warns me that it's running in software rendering mode (just like under VirtualBox with no guest additions).
From guest:
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$ inxi -Fxx
System: Host: mincik Kernel: 4.8.0-53-generic x86_64 (64 bit gcc: 5.4.0)
Desktop: Cinnamon 3.4.3 (Gtk 3.18.9-1ubuntu3.3) dm: lightdm
Distro: Linux Mint 18.2 Sonya
Machine: System: QEMU product: Standard PC (i440FX + PIIX 1996) v: pc-i440fx-2.9
Mobo: N/A model: N/A
Bios: Sea v: 1.10.2-20170228_101828-anatol date: 04/01/2014
Chassis: type: 1 v: pc-i440fx-2.9
CPU: Single core Intel Core (Skylake) (-UP-) cache: 16384 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3) bmips: 6816 speed: 3408 MHz (max)
Graphics: Card: Red Hat QXL paravirtual graphic card
bus-ID: 00:02.0 chip-ID: 1b36:0100
Display Server: X.Org 1.18.4 drivers: (unloaded: fbdev,vesa)
Resolution: 1920x961@59.93hz
GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)
GLX Version: 3.0 Mesa 12.0.6 Direct Rendering: Yes
Audio: Card Intel 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller
driver: snd_hda_intel bus-ID: 00:04.0 chip-ID: 8086:2668
Sound: Advanced Linux Sound Architecture v: k4.8.0-53-generic
Network: Card: Red Hat Virtio network device
driver: virtio-pci port: c0a0 bus-ID: 00:03.0 chip-ID: 1af4:1000
IF: ens3 state: up speed: -1 duplex: unknown mac: 52:54:00:18:00:6b
Drives: HDD Total Size: 16.1GB (56.2% used)
ID-1: /dev/vda model: N/A size: 16.1GB serial: N/A
Partition: ID-1: / size: 11G used: 4.7G (46%) fs: ext4 dev: /dev/vda1
ID-2: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/vda5
RAID: System: supported: N/A
No RAID devices: /proc/mdstat, md_mod kernel module present
Unused Devices: none
Sensors: None detected - is lm-sensors installed and configured?
Info: Processes: 160 Uptime: 16 min Memory: 603.1/3951.3MB
Init: systemd v: 229 runlevel: 5 default: 2 Gcc sys: 5.4.0
Client: Shell (bash 4.3.481 running in gnome-terminal-) inxi: 2.2.35
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$ lspci -kv
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
Subsystem: Red Hat, Inc Qemu virtual machine
Flags: fast devsel
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
Subsystem: Red Hat, Inc Qemu virtual machine
Flags: medium devsel
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] (prog-if 80 [Master])
Subsystem: Red Hat, Inc Qemu virtual machine
Flags: bus master, medium devsel, latency 0
[virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
[virtual] Memory at 000003f0 (type 3, non-prefetchable)
[virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
[virtual] Memory at 00000370 (type 3, non-prefetchable)
I/O ports at c140 [size=16]
Kernel driver in use: ata_piix
Kernel modules: pata_acpi
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
Subsystem: Red Hat, Inc Qemu virtual machine
Flags: medium devsel, IRQ 9
Kernel driver in use: piix4_smbus
Kernel modules: i2c_piix4
00:02.0 VGA compatible controller: Red Hat, Inc. QXL paravirtual graphic card (rev 04) (prog-if 00 [VGA controller])
Subsystem: Red Hat, Inc QEMU Virtual Machine
Flags: fast devsel, IRQ 11
Memory at f4000000 (32-bit, non-prefetchable) [size=64M]
Memory at f8000000 (32-bit, non-prefetchable) [size=64M]
Memory at fc054000 (32-bit, non-prefetchable) [size=8K]
I/O ports at c080 [size=32]
Expansion ROM at 000c0000 [disabled] [size=128K]
Kernel driver in use: qxl
Kernel modules: qxl
00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
Subsystem: Red Hat, Inc Virtio network device
Physical Slot: 3
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c0a0 [size=32]
Memory at fc056000 (32-bit, non-prefetchable) [size=4K]
Memory at febf0000 (64-bit, prefetchable) [size=16K]
Expansion ROM at fc000000 [disabled] [size=256K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
00:04.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 01)
Subsystem: Red Hat, Inc QEMU Virtual Machine
Physical Slot: 4
Flags: bus master, fast devsel, latency 0, IRQ 31
Memory at fc050000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:05.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c0c0 [size=32]
Kernel driver in use: uhci_hcd
00:05.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c0e0 [size=32]
Kernel driver in use: uhci_hcd
00:05.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c100 [size=32]
Kernel driver in use: uhci_hcd
00:05.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])
Subsystem: Red Hat, Inc QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 10
Memory at fc057000 (32-bit, non-prefetchable) [size=4K]
Kernel driver in use: ehci-pci
00:06.0 Communication controller: Red Hat, Inc Virtio console
Subsystem: Red Hat, Inc Virtio console
Physical Slot: 6
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c000 [size=64]
Memory at fc058000 (32-bit, non-prefetchable) [size=4K]
Memory at febf4000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
00:07.0 SCSI storage controller: Red Hat, Inc Virtio block device
Subsystem: Red Hat, Inc Virtio block device
Physical Slot: 7
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c040 [size=64]
Memory at fc059000 (32-bit, non-prefetchable) [size=4K]
Memory at febf8000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
00:08.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon
Subsystem: Red Hat, Inc Virtio memory balloon
Physical Slot: 8
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c120 [size=32]
Memory at febfc000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
Do you have an idea what I'm missing? Have I missed some package that should've been installed in the VM?