Hello, I'm experiencing a regression in which I cannot start a HyperV VM, the issue started in v4.19 and I it exists on the latest available kernel I got from (https://fedoraproject.org/wiki/Kernel_Vanilla_Repositories) My system is a Fedora 29 (x64) and the VM is a Server 2016 with HyperV and VBS enabled, here is a snippet of my QEMU run command: qemu-system-x86_64 \ -machine q35 \ -cpu host,hv-relaxed,hv_spinlocks=0x2000,hv_time,+vmx,invtsc,-hypervisor \ -drive id=drive_image1,if=virtio,cache=none,aio=threads,format=qcow2,file=./VMs/2016.qcow2 \ -enable-kvm \ -m 8G \ -no-hpet \ -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 \ -usbdevice tablet \ -vnc 0.0.0.0:1 -k en-us \ -net user,smb=/tmp/ \ -net nic,model=virtio \ -chardev socket,path=/tmp/qga.sock,server,nowait,id=qga0 \ -device virtio-serial \ -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0 To enable VBS I had to enroll the keys in the BIOS in order to enable SecureBoot The kernel I tried now is: 4.20.16-200.fc29.x86_64 The crash from dmesg is: kernel: Virtual processor ID = 0x0001 kernel: PLE Gap=00000080 Window=00001000 kernel: EPT pointer = 0x000000015defb05e kernel: TPR Threshold = 0x00 kernel: TSC Offset = 0xffffff7fb064e3f6 kernel: IDTVectoring: info=00000000 errcode=00000000 kernel: reason=80000021 qualification=0000000000000000 kernel: VMExit: intr_info=80000306 errcode=00000000 ilen=00000002 kernel: VMEntry: intr_info=00000000 errcode=00000000 ilen=00000000 kernel: ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 kernel: EntryControls=000153ff ExitControls=008fefff kernel: PinBased=0000007f CPUBased=b5a06dfe SecondaryExec=0012f4eb kernel: *** Control State *** kernel: EFER = 0x0000000000000d01 PAT = 0x0407050600070106 kernel: RIP = 0xffffffffc09c89b1 RSP = 0xffffb25709abfcd0 kernel: *** Host State *** kernel: Interruptibility = 00000008 ActivityState = 00000000 kernel: BndCfgS = 0x0000000000000000 kernel: DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 kernel: EFER = 0x0000000000000000 PAT = 0x0606050400070106 kernel: TR: sel=0x0030, attr=0x0008b, limit=0x00000067, base=0xfffff80005182000 kernel: IDTR: limit=0x0000ffff, base=0xfffff800050d6040 kernel: LDTR: sel=0x0000, attr=0x1c000, limit=0xffffffff, base=0x0000000000000000 kernel: GDTR: limit=0x0000ffff, base=0xfffff800050d8000 kernel: GS: sel=0x0020, attr=0x0c093, limit=0xffffffff, base=0xfffff800050d9000 kernel: FS: sel=0x0020, attr=0x0c093, limit=0xffffffff, base=0x0000000000000000 kernel: ES: sel=0x0020, attr=0x0c093, limit=0xffffffff, base=0x0000000000000000 kernel: SS: sel=0x0020, attr=0x0c093, limit=0xffffffff, base=0x0000000000000000 kernel: DS: sel=0x0020, attr=0x0c093, limit=0xffffffff, base=0x0000000000000000 kernel: CS: sel=0x0010, attr=0x0a09b, limit=0xffffffff, base=0x0000000000000000 kernel: Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000 kernel: RFLAGS=0x00000002 DR7 = 0x0000000000000400 kernel: RSP = 0xffffe80000210fc0 RIP = 0xfffff80004d16125 kernel: CR3 = 0x000000000039d000 kernel: CR4: actual=0x0000000000002648, shadow=0x0000000000000648, gh_mask=ffffffffffffe871 kernel: CR0: actual=0x0000000080010031, shadow=0x0000000080010031, gh_mask=fffffffffffffff7 kernel: *** Guest State *** The CPU I'm running with is i7-7700 $ cat /sys/module/kvm_intel/parameters/nested Y Thank you, -- Jon.
