DmaBuf not working on 16.04.3 with latest 4.14-stable kernel

[newperson1746]

Have compiled the latest 4.14-stable cloned from here with the relevant i915 KVMGT driver bits set to "y" and I have a Broadwell GPU (MacBookAir6,2 a.k.a "Early 2015") that works with vgpu (if headless, it works fine, I mean.) however using kvmgt-dmabuf-example to show the guest's framebuffer does not work (no display output unless I specifically add another vga device like -vga qxl.) I also noticed that some firmware load failed in the syslog, which could be the cause of the problem:

$ dmesg | grep -i i915
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.14.0-newperson1746-test2-generic root=UUID=e5561bd9-6268-4883-83e5-aa521d59814b ro --verbose i915.enable_gvt=1 kvm.ignore_msrs=0 intel_iommu=igfx_off vt.handoff=7
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.14.0-newperson1746-test2-generic root=UUID=e5561bd9-6268-4883-83e5-aa521d59814b ro --verbose i915.enable_gvt=1 kvm.ignore_msrs=0 intel_iommu=igfx_off vt.handoff=7
[    1.874932] i915 0000:00:02.0: Direct firmware load for i915/gvt/vid_0x8086_did_0x1626_rid_0x09.golden_hw_state failed with error -2
[    1.886786] i915 0000:00:02.0: MDEV: Registered
[    1.886852] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    1.902343] [drm] Initialized i915 1.6.0 20170818 for 0000:00:02.0 on minor 0
[    4.469475] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    6.776064] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])

From qemu:

$ qemu-system-x86_64 ... {long options}
qemu-system-x86_64: -device vfio-pci,sysfsdev=/sys/bus/pci/devices/0000:00:02.0/20d78d8d-d2f1-416f-b49a-fc9a58171df0: vfio: get dmabuf mgr fd failed:-1

egl extensions found. Intel GVT-g indirect display will be enabled
Use dma-buf to get guest framebuffer

I am trying gvt-staging now, however that branch is older by 3 days and therefore my hopes aren't high.

[TerrenceXu]

Hello, which qemu branch you are used? From: newperson1746 [mailto:notifications@github.com] Sent: Monday, January 15, 2018 7:35 AM To: intel/gvt-linux <gvt-linux@noreply.github.com> Cc: Subscribed <subscribed@noreply.github.com> Subject: [intel/gvt-linux] DmaBuf not working on 16.04.3 with latest 4.14-stable kernel (#11) Have compiled the latest 4.14-stable cloned from here with the relevant i915 KVMGT driver bits set to "y" and I have a Broadwell GPU (MacBookAir6,2 a.k.a "Early 2015") that works with vgpu, however using kvmgt-dmabuf-example to show the guest's framebuffer does not work. $ dmesg | grep -i i915 [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.14.0-newperson1746-test2-generic root=UUID=e5561bd9-6268-4883-83e5-aa521d59814b ro --verbose i915.enable_gvt=1 kvm.ignore_msrs=0 intel_iommu=igfx_off vt.handoff=7 [ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.14.0-newhacker1746-test2-generic root=UUID=e5561bd9-6268-4883-83e5-aa521d59814b ro --verbose i915.enable_gvt=1 kvm.ignore_msrs=0 intel_iommu=igfx_off vt.handoff=7 [ 1.874932] i915 0000:00:02.0: Direct firmware load for i915/gvt/vid_0x8086_did_0x1626_rid_0x09.golden_hw_state failed with error -2 [ 1.886786] i915 0000:00:02.0: MDEV: Registered [ 1.886852] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem [ 1.902343] [drm] Initialized i915 1.6.0 20170818 for 0000:00:02.0 on minor 0 [ 4.469475] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ 6.776064] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915]) From qemu: $ qemu-system-x86_64 ... {long options} qemu-system-x86_64: -device vfio-pci,sysfsdev=/sys/bus/pci/devices/0000:00:02.0/20d78d8d-d2f1-416f-b49a-fc9a58171df0: vfio: get dmabuf mgr fd failed:-1 egl extensions found. Intel GVT-g indirect display will be enabled Use dma-buf to get guest framebuffer I am trying gvt-staging now, however that branch is older by 3 days and therefore my hopes aren't high. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<#11>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AYv0NLjXSG857Uj6ar6EQLAVhjGerpCJks5tKo8bgaJpZM4RdyRE>.

[newperson1746]

I used intel/Igvtg-qemu:kvmgt_dmabuf_example.

[TerrenceXu]

Hello Please use “gvt-staging” branch in kernel side, since the “gvt-stable-4.14’ just be created and without dma-buf feature be validated. And use “qa_dma_buf” branch in qemu side, it with the dma-buf feature be validated. Now dma-buf feature is still in experimental stage, we will provide the official guide when it is stable enough. ☺ Thanks Terrence From: newperson1746 [mailto:notifications@github.com] Sent: Tuesday, January 16, 2018 1:22 AM To: intel/gvt-linux <gvt-linux@noreply.github.com> Cc: Xu, Terrence <terrence.xu@intel.com>; Comment <comment@noreply.github.com> Subject: Re: [intel/gvt-linux] DmaBuf not working on 16.04.3 with latest 4.14-stable kernel (#11) I used intel/Igvtg-qemu:kvmgt_dmabuf_example. — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#11 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AYv0NOdg2u-5-u8XrSOCYF_h2CNK-AJ_ks5tK4k9gaJpZM4RdyRE>.

[trevor403]

It seems that these two branches are not compatible at the moment. Using them at their current commit causes ioctl Invalid Argument for the VFIO GFX PLANE, sorry I can't copy and past I'm in a cab. Anyway are there any compatible dma-buf branches for gvt linux+qemu?

[TerrenceXu]

Hello, in order to use the the dma-buf feature, you can use the latest stable-4.14 kernel with the latest stable 2.10.0 qemu. ☺ Thanks Terrence From: trevor403 [mailto:notifications@github.com] Sent: Sunday, February 4, 2018 10:47 PM To: intel/gvt-linux <gvt-linux@noreply.github.com> Cc: Xu, Terrence <terrence.xu@intel.com>; Comment <comment@noreply.github.com> Subject: Re: [intel/gvt-linux] DmaBuf not working on 16.04.3 with latest 4.14-stable kernel (#11) It seems that these two branches are not compatible at the moment. Using them at their current commit causes ioctl Invalid Argument for the VFIO GFX PLANE, sorry I can't copy and past I'm in a cab. Anyway are there any working matching dma-buf branches you know of currently? — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#11 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AYv0NFWAWdO7mEf_7rmFsmsajZNXBvnPks5tRcLqgaJpZM4RdyRE>.

[trevor403]

Do you know if the 15.60 guest driver will write to the VGPU PLANE, or is the dma-buf feature only functional under 15.45 guest drivers

[TerrenceXu]

The dma-buf is also working on 15.60 guest driver, but the 15.60 guest driver with the guest low performance issue and need to be fixed, so we still recommend use 15.45 driver, and after the issue be fixed we still recommend it in the Wiki page. ☺ Thanks Terrence From: trevor403 [mailto:notifications@github.com] Sent: Wednesday, February 7, 2018 2:16 AM To: intel/gvt-linux <gvt-linux@noreply.github.com> Cc: Xu, Terrence <terrence.xu@intel.com>; Comment <comment@noreply.github.com> Subject: Re: [intel/gvt-linux] DmaBuf not working on 16.04.3 with latest 4.14-stable kernel (#11) Do you know if the 15.60 guest driver will write to the VGPU PLANE, or is the dma-buf feature only functional under 15.45 guest drivers — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#11 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AYv0NNGbV5LtYIWwVcUZ-PMz4vKO-EZqks5tSJbPgaJpZM4RdyRE>.

[oscarbg]

@TerrenceXu @trevor403 do you know if with 15.65.3 drivers dma_buf performance is restored to 15.45 levels?
I mean
"Intel HD Graphics Driver 15.65.3 for Windows 10 64-bit" win64_15.65.3.4944.exe
or new 23.20.16.4958
http://www.station-drivers.com/index.php?option=com_kunena&view=topic&catid=4&id=2016&Itemid=255&limitstart=92&lang=fr#16118

[TerrenceXu]

Hello, the 15.45 Driver without the performance issue but the 15.65 Driver with the performance regression issue, you can use the 15.45 Driver first. ☺ From: Oscar Barenys [mailto:notifications@github.com] Sent: Tuesday, February 20, 2018 12:10 PM To: intel/gvt-linux <gvt-linux@noreply.github.com> Cc: Xu, Terrence <terrence.xu@intel.com>; Mention <mention@noreply.github.com> Subject: Re: [intel/gvt-linux] DmaBuf not working on 16.04.3 with latest 4.14-stable kernel (#11) @TerrenceXu<https://github.com/terrencexu> @trevor403<https://github.com/trevor403> do you know if with 15.65.3 drivers dma_buf performance is restored to 15.45 levels? I mean "Intel HD Graphics Driver 15.65.3 for Windows 10 64-bit" win64_15.65.3.4944.exe or new 23.20.16.4958 http://www.station-drivers.com/index.php?option=com_kunena&view=topic&catid=4&id=2016&Itemid=255&limitstart=92&lang=fr#16118 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#11 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AYv0NER_-yEQN_Q7hHwv3-rj6SOBdM6cks5tWkWLgaJpZM4RdyRE>.