PPA looks good:

2.5+dfsg-5ubuntu10.39:

2019-05-28 13:23:48.644+0000: starting up libvirt version: 1.3.1, package: 1ubuntu10.26 (Marc Deslauriers <email address hidden> Tue, 14 May 2019 15:13:18 -0400), qemu version: 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.39), hostname: qemubug
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 -name kguest -S -machine pc-i440fx-2.5,accel=kvm,usb=off -cpu host -m 1024 -realtime mlock=off -smp 3,sockets=3,cores=1,threads=1 -uuid 7e55c71a-558f-412c-8445-db0e95fc549f -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-kguest/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -kernel /var/lib/libvirt/images/kguest/vmlinuz -initrd /var/lib/libvirt/images/kguest/initrd.img -append 'root=/dev/vda noresume console=tty0 console=ttyS0,38400n8 apparmor=0 net.ifnames=0 crashkernel=256M' -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/kguest/disk01.ext4.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -fsdev local,security_model=passthrough,id=fsdev-fs0,path=/home/inaddy -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=inaddy,bus=pci.0,addr=0x5 -fsdev local,security_model=passthrough,id=fsdev-fs1,path=/root -device virtio-9p-pci,id=fs1,fsdev=fsdev-fs1,mount_tag=root,bus=pci.0,addr=0x6 -netdev tap,fd=26,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:b4:78:29,bus=pci.0,addr=0x2 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on
Domain id=2 is tainted: high-privileges
Domain id=2 is tainted: host-cpu
char device redirected to /dev/pts/5 (label charserial0)
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 0]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 1]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 2]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 3]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 4]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 5]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 6]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 7]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 8]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 9]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 12]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 13]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 14]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 15]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 16]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 17]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 23]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 24]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 0]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 1]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 2]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 3]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 4]
warning: host doesn't support requested feature: CPUID.80000001H:EDX [bit 5]
...

2.5+dfsg-5ubuntu10.40~ppa1:

2019-05-28 13:28:14.884+0000: starting up libvirt version: 1.3.1, package: 1ubuntu10.27~ppa4 (Christian Ehrhardt <email address hidden> Tue, 28 May 2019 08:23:25 +0200), qemu version: 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.40~ppa1), hostname: qemubug
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-system-x86_64 -name kguest -S -machine pc-i440fx-2.5,accel=kvm,usb=off -cpu host -m 1024 -realtime mlock=off -smp 3,sockets=3,cores=1,threads=1 -uuid 7e55c71a-558f-412c-8445-db0e95fc549f -nographic -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-kguest/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -kernel /var/lib/libvirt/images/kguest/vmlinuz -initrd /var/lib/libvirt/images/kguest/initrd.img -append 'root=/dev/vda noresume console=tty0 console=ttyS0,38400n8 apparmor=0 net.ifnames=0 crashkernel=256M' -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/libvirt/images/kguest/disk01.ext4.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -fsdev local,security_model=passthrough,id=fsdev-fs0,path=/home/inaddy -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=inaddy,bus=pci.0,addr=0x5 -fsdev local,security_model=passthrough,id=fsdev-fs1,path=/root -device virtio-9p-pci,id=fs1,fsdev=fsdev-fs1,mount_tag=root,bus=pci.0,addr=0x6 -netdev tap,fd=26,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:b4:78:29,bus=pci.0,addr=0x2 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on
Domain id=1 is tainted: high-privileges
Domain id=1 is tainted: host-cpu
char device redirected to /dev/pts/5 (label charserial0)