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--- gpu_accelerated_vm_with_kvm [31.10.2018 06:27] – [3rd Try: Nice DCV] Pascal Suter
+++ gpu_accelerated_vm_with_kvm [28.11.2018 23:30] – [retry DCV] Pascal Suter
@@ Line 287: / Line 287: @@
   qemu-system-x86_64 -enable-kvm -k de-ch -name windows -drive format=raw,file=/dev/vms/dcv,if=virtio,format=raw,index=0 -m 9000 -device virtio-net-pci,netdev=net0,mac=52:54:00:01:00:01 -netdev tap,id=net0 -cdrom Win10_1803_English_x64.iso -drive file=virtio-win.iso,media=cdrom,index=1 -monitor tcp:127.0.0.1:5801,server,nowait -boot once=d -cpu host,kvm=off -smp cpus=8,cores=8 -device vfio-pci,host=05:00.0 -monitor vc -drive if=pflash,format=raw,readonly,file=/usr/share/OVMF/OVMF_CODE.fd -drive if=pflash,format=raw,file=/bulk/vm/OVMF_VARS.windows10.fd -rtc base=localtime -balloon none -serial none -parallel none -M q35 -vnc :1
+as far as speed goes, this worked out a lot better, however i could not get DCV to run reliably.
+this time i've created a snapshot prior to installing DCV and i later cloned that snapshot to install RGS on a "plain" clone of the windows install in a second LVM volume. Here is my command to start the RGS VM:
+  qemu-system-x86_64 -enable-kvm -k de-ch -name windows -drive format=raw,file=/dev/vms/rgs,if=virtio,format=raw,index=0 -m 9000 -device virtio-net-pci,netdev=net0,mac=52:54:00:01:00:01 -netdev tap,id=net0 -cdrom Win10_1803_English_x64.iso -drive file=virtio-win.iso,media=cdrom,index=1 -monitor tcp:127.0.0.1:5801,server,nowait -boot once=d -cpu host,kvm=off -smp cpus=8,cores=8 -monitor vc -drive if=pflash,format=raw,readonly,file=/usr/share/OVMF/OVMF_CODE.fd -drive if=pflash,format=raw,file=/bulk/vm/OVMF_VARS.windows10.fd -rtc base=localtime -balloon none -serial none -parallel none -M q35 -vnc :1 -device vfio-pci,host=05:00.0
+RGS runs smooth and windows feels reasonably fast too with the SSD as storage behind it. however, When the vm is left running over night usually the next morning it hangs or is so slow that one often can't even shut it down properly. I don't know why that is, i've deactivated all power saving features of windows, screen blanking etc. but I still have this issue. The machine hangs the same when I connect vie windows RDP. Also in those cases where i can still see something, I usually get alot of horizontal lines as artefacts on the screen both with RGS and RDP. The only solution is then to shut down the VM and start it again, a Reboot (instead of a power cycle) will make the VM fast again but the Artefacts remain. so there is definately something wrong with my VM here. This needs further investigation!
+==== LVM stuff ====
+just as a quick side note: here is how you create and revert to a snapshot in lvm.  using dd you can also copy a snapshot into a new lvm volume if the new volume is at least the size of the snapshotted one.
+create a snapshot:
+  lvcreate -s -L 50G -n win10base /dev/vms/dcv
+revert to a snapshot:
+  lvconvert --merge /dev/vms/win10base
+==== using a vm with just the forwarded GPU ====
+this is the ultimate goal. so far i could not get this to work, whenver i booted a vm without a emulated graphics card i could no longer connect to it. and it was hard to debug as i had no "local" screen to connect to. however, i recently connected a monitor to the GPU and found out, that the reason why i could not connect was in fact very simple: once the emulated graphics adapter is no longer presence, the pci-id of the emulated NIC changes and windows detects it as a new ethernet adapter despite it having the same MAC. So the vm actually got a DHCP assigned ip rather than the fixed one i had configured. I could then connect to the dhcp assigned ip and set the same fixed ip on the "second" interface which now works fine.
+to start a vm without a emulated graphics card, use ''-nographic -vga none'' in your command line.