Info on vm to vm looking-glass

Software & Operating Systems Looking Glass
1

  1. Can looking glass be used to capture frames from windows 10 vm and display them on another linux vm?

  2. What are the software components I need to do this?

  3. What extra steps are there compared to a normal vm guest to host looking glass setup?

    I have a working passthrough setup with on an Asus m5a97r2 mobo. The cpu is a fx8370. first vm has a gtx 1070 passed through. The other vm would use an amd xfx6570 passed through. The host uses a legacy pci slot with a gforce gt 610. The idea is to capture the gtx1070 windows vm screen and view it on the amd6570 linux vm. All linux installs use arch linux.

2

Yes

Looking Glass and the KVMFR Kernel module for your Linux VM in the Looknig Glass module directory.

For Windows, nothing different. For your Linux VM, just add a IVSHMEM device using the same shared memory and load the KVMFR kernel module. In the Linux guest VM instead of uisng /dev/shm/looking-glass as the shared memory file for the LG client, use /dev/uio0.

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3

Got it working:

On the Linux host:

 touch /dev/shm/looking-glass && chown qemu:qemu /dev/shm/looking-glass && chmod 660 /dev/shm/looking-glass

Linux Guest VM:

  1. edit libvirt config:
<shmem name='looking-glass'>
  <model type='ivshmem-plain'/>
  <size unit='M'>128</size>
</shmem>
  1. compile & install the client
dnf install make cmake binutils-devel SDL2-devel SDL2_ttf-devel nettle-devel spice-protocol fontconfig-devel libX11-devel egl-wayland-devel wayland-devel mesa-libGLU-devel mesa-libGLES-devel mesa-libGL-devel mesa-libEGL-devel libXfixes-devel
git clone --recursive https://github.com/gnif/LookingGlass.git
cd LookingGlass/
git checkout B1  -f
mkdir client/build
cd client/build
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ../
make
ln -s $(pwd)/looking-glass-client /usr/local/bin/
  1. compile the kernel module
 dnf install kernel-devel -y
 cd module
 dkms install .
  1. load the needed kernel modules
 modprobe uio
 modprobe kvmfr

Windows Guest VM:

  1. edit the libvirt config
<shmem name='looking-glass'>
  <model type='ivshmem-plain'/>
  <size unit='M'>128</size>
</shmem>
  1. install virtio driver
  2. install and start the host process

Using the following command line i got it working:

 looking-glass-client -f /dev/uio0 -L 128 -s
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