[gentoo-user] Re: [SOLVED] 3D graphics acceleration on QEMU

[Mick]

I had a look at this again this morning and cracked it.  More info below.

On Monday 17 Jul 2017 00:00:53 Mick wrote:
> On Sunday 16 Jul 2017 22:49:54 Neil Bothwick wrote:
> > On Sun, 16 Jul 2017 16:20:15 +0100, Mick wrote:
> > > Another annoying thing was the bottom of the screen was cropped off and
> > > to see the main menu and toolbar I have to move the mouse past the
> > > bottom edge of the window.  The visual aperture is smaller than the
> > > desktop screen size.  I don't know if this in anyway related to the
> > > above warning.
> >
> > I see that one regularly, the desktop is 1024x768 but the display is
> > 1024x720. simply change the display to 1024x720 in Mint's prefs or use a
> > different video card emulation, such as vmware, by adding "-vga vmware"
> > to your options.
>
> Thanks Neil, I'll try this out when I boot it up next time.  Meanwhile, I'm
> not sure if the virtio drivers in the kernel are meant for guest kernels
> only, or if I should have them enabled on the host's.
>
> This is the modules I have enabled on the host which is VT-x capable:
>
> # grep -e DMAR -e IOMMU -e VIRT /usr/src/linux/.config
> CONFIG_VIRT_CPU_ACCOUNTING=y
> CONFIG_VIRT_CPU_ACCOUNTING_GEN=y
> CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
> # CONFIG_GART_IOMMU is not set
> # CONFIG_CALGARY_IOMMU is not set
> CONFIG_IOMMU_HELPER=y
> CONFIG_VIRT_TO_BUS=y
> CONFIG_VIRTIO_BLK=m
> CONFIG_VIRTIO_NET=m
> # CONFIG_VIRTIO_CONSOLE is not set
> # CONFIG_HW_RANDOM_VIRTIO is not set
> # CONFIG_DRM_VIRTIO_GPU is not set
> # CONFIG_FB_VIRTUAL is not set
> # CONFIG_SND_VIRTUOSO is not set
> # CONFIG_VIRT_DRIVERS is not set
> CONFIG_VIRTIO=m
> # CONFIG_VIRTIO_PCI is not set
> # CONFIG_VIRTIO_BALLOON is not set
> # CONFIG_VIRTIO_INPUT is not set
> # CONFIG_VIRTIO_MMIO is not set
> CONFIG_IOMMU_API=y
> CONFIG_IOMMU_SUPPORT=y
> # Generic IOMMU Pagetable Support
> CONFIG_IOMMU_IOVA=y
> # CONFIG_AMD_IOMMU is not set
> CONFIG_DMAR_TABLE=y
> CONFIG_INTEL_IOMMU=y
> CONFIG_INTEL_IOMMU_SVM=y
> CONFIG_INTEL_IOMMU_DEFAULT_ON=y
> CONFIG_INTEL_IOMMU_FLOPPY_WA=y
> # CONFIG_DEBUG_VIRTUAL is not set
> # CONFIG_IOMMU_STRESS is not set
> CONFIG_VIRTUALIZATION=y
>
> The CPU has vmx, but not vmd:
>
> processor	: 7
> vendor_id	: GenuineIntel
> cpu family	: 6
> model		: 30
> model name	: Intel(R) Core(TM) i7 CPU       Q 720  @ 1.60GHz
> stepping	: 5
> microcode	: 0x7
> cpu MHz		: 933.000
> cache size	: 6144 KB
> physical id	: 0
> siblings	: 8
> core id		: 3
> cpu cores	: 4
> apicid		: 7
> initial apicid	: 7
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 11
> wp		: yes
> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp
> lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc
> aperfmperf eagerfpu pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16
> xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm tpr_shadow vnmi flexpriority ept
> vpid dtherm ida
> bugs		:
> bogomips	: 3191.45
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 36 bits physical, 48 bits virtual
> power management:

The above are as they should be.  When building qemu it is important to set 
USE="virgl".  This is how mine was built:

[ebuild   R    ] app-emulation/qemu-2.9.0-r2::gentoo  USE="aio alsa bluetooth 
bzip2 caps curl fdt filecaps gtk gtk2 jpeg ncurses nls opengl pin-upstream-
blobs png pulseaudio sdl sdl2 seccomp usb vhost-net virgl virtfs vnc xattr -
accessibility -debug (-glusterfs) -gnutls -infiniband -iscsi -lzo -nfs -numa -
python -rbd -sasl (-selinux) -smartcard -snappy -spice -ssh -static -static-
user -systemtap -tci {-test} -usbredir -vde -vte -xen -xfs" LINGUAS="-bg -
de_DE -fr_FR -hu -it -tr -zh_CN" PYTHON_TARGETS="python2_7" 
QEMU_SOFTMMU_TARGETS="x86_64 -aarch64 -alpha -arm -cris -i386 -lm32 -m68k -
microblaze -microblazeel -mips -mips64 -mips64el -mipsel -moxie -nios2 -or1k -
ppc -ppc64 -ppcemb -s390x -sh4 -sh4eb -sparc -sparc64 -tricore -unicore32 -
xtensa -xtensaeb" QEMU_USER_TARGETS="-aarch64 -alpha -arm -armeb -cris -hppa -
i386 -m68k -microblaze -microblazeel -mips -mips64 -mips64el -mipsel -mipsn32 
-mipsn32el -nios2 -or1k -ppc -ppc64 -ppc64abi32 -ppc64le -s390x -sh4 -sh4eb -
sparc -sparc32plus -sparc64 -tilegx -x86_64*" 0 KiB

Thereafter, the trick in getting hardware acceleration in the guest is to set 
'-vga virtio' when launching the guest VM with qemu:

$ qemu-system-x86_64 -m 1024 -enable-kvm -display sdl,gl=on -vga virtio -drive 
if=virtio,file=Mint_18.2_HDA.qcow2,cache=none
gl_version 33 - core profile enabled

As you can see it returns 'gl_version 33 - core profile enabled' on the 
terminal.  When I login the guest's desktop no longer warns that there will be 
no hardware acceleration.  :-)

This is what the guest shows:

$ dmesg | grep -i drm
[    1.413078] [drm] Initialized drm 1.1.0 20060810
[    1.488900] [drm] pci: virtio-vga detected
[    1.488903] fb: switching to virtiodrmfb from VESA VGA
[    1.490827] [drm] virgl 3d acceleration enabled      <==virgl being used
[    1.491401] [drm] virtio vbuffers: 272 bufs, 192B each, 51kB total.
[    1.494571] [drm] number of scanouts: 1
[    1.494577] [drm] number of cap sets: 1
[    1.504333] [drm] cap set 0: id 1, max-version 1, max-size 308
[    1.505633] virtio_gpu virtio0: fb0: virtiodrmfb frame buffer device
[    1.505638] [drm] Initialized virtio_gpu 0.0.1 0 on minor 0


$glxinfo
name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile,
    GLX_ARB_fbconfig_float, GLX_ARB_framebuffer_sRGB, GLX_ARB_multisample,
    GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile,
    GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB,
    GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info,
    GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
    GLX_OML_swap_method, GLX_SGIS_multisample, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, GLX_SGI_swap_control
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile,
    GLX_ARB_create_context_robustness, GLX_ARB_fbconfig_float,
    GLX_ARB_framebuffer_sRGB, GLX_ARB_get_proc_address, GLX_ARB_multisample,
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,
    GLX_EXT_create_context_es_profile, GLX_EXT_fbconfig_packed_float,
    GLX_EXT_framebuffer_sRGB, GLX_EXT_import_context,
    GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info, GLX_EXT_visual_rating,
    GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
    GLX_SGI_swap_control, GLX_SGI_video_sync
GLX version: 1.4
GLX extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile,
    GLX_ARB_fbconfig_float, GLX_ARB_framebuffer_sRGB,
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_buffer_age,
    GLX_EXT_create_context_es2_profile, GLX_EXT_create_context_es_profile,
    GLX_EXT_fbconfig_packed_float, GLX_EXT_framebuffer_sRGB,
    GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, GLX_EXT_visual_info,
    GLX_EXT_visual_rating, GLX_INTEL_swap_event, GLX_MESA_copy_sub_buffer,
    GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
    GLX_MESA_swap_control, GLX_OML_swap_method, GLX_OML_sync_control,
    GLX_SGIS_multisample, GLX_SGIX_fbconfig, GLX_SGIX_pbuffer,
    GLX_SGIX_visual_select_group, GLX_SGI_make_current_read,
    GLX_SGI_swap_control, GLX_SGI_video_sync
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Red Hat (0x1af4)
    Device: virgl (0x1010)
    Version: 12.0.6
    Accelerated: yes
    Video memory: 0MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 3.3
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.0
OpenGL vendor string: Red Hat
OpenGL renderer string: Gallium 0.4 on virgl
OpenGL core profile version string: 3.3 (Core Profile) Mesa 12.0.6
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

I hope this helps others.
-- 
Regards,
Mick