Right, an L1 line of : ./x86_64-softmmu/qemu-system-x86_64 -M q35,accel=kvm -cpu host
does trigger it for me. My L0 is: /usr/bin/qemu-system-x86_64 -machine accel=kvm -name guest=fedora29 ,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/home/dgilbert/.config/libvirt/qemu/lib/domain-1-fedora29 /master-key.aes -machine pc-q35-3.0,accel=kvm,usb=off,vmport=off,dump- guest-core=off -cpu Skylake-Client- IBRS,ss=on,vmx=on,hypervisor=on,tsc_adjust=on,clflushopt=on,ssbd=on,xsaves=on,pdpe1gb=on -m 4096 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 -uuid d070c898-4323-46f6-b8c2-566061a2f88d -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=27,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root- port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 -device pcie-root- port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie- root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 -device pcie-root- port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 -device pcie- root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 -device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 -device virtio- serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 -drive file=/home/vmimages/fedora29.qcow2,format=qcow2,if=none,id=drive-virtio- disk0 -device virtio-blk-pci,scsi=off,bus=pci.4,addr=0x0,drive=drive- virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,id=drive- sata0-0-0,media=cdrom,readonly=on -device ide-cd,bus=ide.0,drive=drive- sata0-0-0,id=sata0-0-0 -netdev user,id=hostnet0 -device virtio-net- pci,netdev=hostnet0,id=net0,mac=52:54:00:c3:dc:36,bus=pci.1,addr=0x0 -chardev pty,id=charserial0 -device isa- serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,fd=29,server,nowait -device virtserialport,bus =virtio- serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio- serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -spice port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off ,seamless-migration=on -device virtio- vga,id=video0,max_outputs=1,bus=pcie.0,addr=0x1 -device ich9-intel- hda,id=sound0,bus=pcie.0,addr=0x1b -device hda- duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb- redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev spicevmc,id=charredir1,name=usbredir -device usb- redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device virtio- balloon-pci,id=balloon0,bus=pci.5,addr=0x0 -object rng- random,id=objrng0,filename=/dev/urandom -device virtio-rng- pci,rng=objrng0,id=rng0,bus=pci.6,addr=0x0 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on using a f29 packaged qemu-kvm-3.0.0-3.fc29.x86_64 on 4.20.8-200.fc29.x86_64 host. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1813165 Title: KVM internal error. Suberror: 1 emulation failure Status in QEMU: New Bug description: Hello Devs. Having problems getting VM to run with qemu 3.1.0. I should mention it's a nested configuration. 2019-01-24 13:46:08.648+0000: starting up libvirt version: 4.10.0, qemu version: 3.1.0, kernel: 4.14.94, hostname: one.... LC_ALL=C PATH=/bin:/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin HOME=/root USER=root QEMU_AUDIO_DRV=none /usr/bin/kvm -name guest=one-266,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-one-266/master-key.aes -machine pc-i440fx-2.9,accel=kvm,usb=off,dump-guest-core=off -cpu Skylake-Client-IBRS,ss=on,hypervisor=on,tsc_adjust=on,clflushopt=on,ssbd=on,xsaves=on,pdpe1gb=on -m 1024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid b219b45d-a2f0-4128-a948-8673a7abf968 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=21,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/one//datastores/0/266/disk.0,format=qcow2,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on -drive file=/var/lib/one//datastores/0/266/disk.1,format=raw,if=none,id=drive-ide0-0-0,readonly=on -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=23,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=02:00:00:76:69:85,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 0.0.0.0:266 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on char device redirected to /dev/pts/1 (label charserial0) KVM internal error. Suberror: 1 emulation failure EAX=00000001 EBX=000f7c2c ECX=00000001 EDX=00000001 ESI=00006a26 EDI=3ffbdc48 EBP=000069e6 ESP=000a8000 EIP=000fd057 EFL=00010016 [----AP-] CPL=0 II=0 A20=1 SMM=1 HLT=0 ES =0010 00000000 ffffffff 00c09300 CS =0000 00000000 00000fff 00809b00 SS =0010 00000000 ffffffff 00c09300 DS =0010 00000000 ffffffff 00c09300 FS =0010 00000000 ffffffff 00c09300 GS =0010 00000000 ffffffff 00c09300 LDT=0000 00000000 0000ffff 00008200 TR =0000 00000000 0000ffff 00008b00 GDT= 10387cfe 0000fe6c IDT= 0010387c 00003810 CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000fffecffc DR7=000000000e1e0400 EFER=0000000000000000 Code=cb 66 ba 4d d0 0f 00 e9 c8 fe bc 00 80 0a 00 e8 31 3a ff ff <0f> aa fa fc 66 ba 66 d0 0f 00 e9 b1 fe f3 90 f0 0f ba 2d ac 3b 0f 00 00 72 f3 8b 25 a8 3b 2019-01-24T13:47:39.383366Z kvm: terminating on signal 15 from pid 2708 (/usr/sbin/libvirtd) Someone has an idea whats going wrong here? thanks and cheers t. 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