Hello. I’m trying to configure the GPU Passthrough in my PC. I’m running Ubuntu 19.04 as host OS and I want to run Windows 10 as Guest. The mobo that I have is Gigabyte Aorus Pro ; Cpu I9-9900k ; 32 GB RAM ; I have two monitors and two graphic devices. The first is embedded inside the Mobo and it’s Intel Graphic 630. The second is Nvidia Geforce RTX 2080 ti. One monitor is attached to the intel graphic and the other one to the nvidia card. I have isolated the Nvidia Geforce RTX 2080 ti (going inside the BIOS and selecting the Intel graphic as primary device) and I gave it to a Qemu / KVM virtual machine using virt-manager. I’ve been able to load and run Windows 10 inside the virtual machine and it worked ok for sometime. What it didn’t work has been the Geforce RTX 2080 ti because it has not been recognized by Windows 10,that gave the error 43. But I’ve found this patch :
and I have applied it like so :
root@ziomario-Z390-AORUS-PRO:/home/ziomario/Scrivania/Pass# virshpatcher --error43 --hugepages --host-passthrough win10
Patching: win10
Applying: PatchE43
Applying: PatchHugepages
Applying: PatchHostPassthrough
but when I have restarted the win10 vm I’ve encountered this error :
Error starting domain : internal error: process exited while connecting to monitor: 2019-10-14T21:52:03.418937Z qemu-system-x86_64: unable to map backing store for guest RAM: Cannot allocate memory
Traceback (most recent call last):
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 75, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 111, in tmpcb
callback(*args, **kwargs)
File “/usr/share/virt-manager/virtManager/libvirtobject.py”, line 66, in newfn
ret = fn(self, *args, **kwargs)
File “/usr/share/virt-manager/virtManager/domain.py”, line 1400, in startup
self._backend.create()
File “/usr/lib/python3/dist-packages/libvirt.py”, line 1080, in create
if ret == -1: raise libvirtError (‘virDomainCreate() failed’, dom=self)
libvirt.libvirtError: internal error: process exited while connecting to monitor: 2019-10-14T21:52:03.418937Z qemu-system-x86_64: unable to map backing store for guest RAM: Cannot allocate memory
how can I revert the modifications that the patch did in relation with the HugePages ? because the VM started correctly before applying that. Only the nvidia graphic card did not work. So,my idea is to apply only these patches :
PatchE43
PatchHostPassthrough
These are some relevant informations that you may need to understand how to fix that error :
root@ziomario-Z390-AORUS-PRO:/home/ziomario/Scrivania/Pass# cat /proc/meminfo | grep Huge
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
Hugetlb: 0 kB
root@ziomario-Z390-AORUS-PRO:/home/ziomario/Scrivania/Pass# free -mh
total used free shared buff/cache available
Mem: 31Gi 1,5Gi 27Gi 223Mi 2,4Gi 29Gi
Swap: 31Gi 0B 31Gi