Kvm does not work properly when emulating host cpu with qemu-system-x86_64

I used this qemu-system-x86_64 -enable-kvm -display sdl -cpu host -net nic,model=e1000 -serial mon:stdio -m 3072 -drive format=raw,file=var/run/seoul-net.img -machine q35 to emulate a personal hypervisor (https://github.com/ptokponnon/NOVA/tree/cached_cow_refined).
But since my ubuntu's kernel was upgraded from 5.0.0-29-generic to 5.0.0-32-generic, the hypervisor crashes during boot time and reboots.
When I tried to debug, I discovered that it throws a page fault in the kernel on a specific address while the address is well mapped (checked via info mem and info tlb).
I have frozen the kernel on 5.0.0-29 to continue running my hypervisor. The 5.0.0-31-generic version has also the same problem. I don't know for the other versions.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.0.0-32-generic 5.0.0-32.34~18.04.2
ProcVersionSignature: Ubuntu 5.0.0-32.34~18.04.2-generic 5.0.21
Uname: Linux 5.0.0-32-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 27 21:37:53 2019
InstallationDate: Installed on 2019-09-14 (43 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)