Thanks Masato,
since thta sounds more like an issue in the kernel you refer to I have added a 
bug task for `linux-oem-5.13` to be triaged from the kernel POV as well.

** Also affects: linux-oem-5.13 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1944104

Title:
  nested vm on vm not running

Status in linux-oem-5.13 package in Ubuntu:
  New
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  The host machine ubuntu 20.04 kernel is 5.13.0-1012-oem,
  When the kernel of the guest machine is ubuntu 20.04 kernel 5.4.0-84-generic,
  vm cannot be started on the guest machine.

  -------------------------------------
  KVM: entry failed, hardware error 0x7
  EAX=00000000 EBX=00000000 ECX=00000000 EDX=000a0671
  ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
  EIP=0000fff0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
  ES =0000 00000000 0000ffff 00009300
  CS =f000 ffff0000 0000ffff 00009b00
  SS =0000 00000000 0000ffff 00009300
  DS =0000 00000000 0000ffff 00009300
  FS =0000 00000000 0000ffff 00009300
  GS =0000 00000000 0000ffff 00009300
  LDT=0000 00000000 0000ffff 00008200
  TR =0000 00000000 0000ffff 00008b00
  GDT=     00000000 0000ffff
  IDT=     00000000 0000ffff
  CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
  DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 
DR3=0000000000000000
  DR6=00000000ffff0ff0 DR7=0000000000000400
  EFER=0000000000000000
  Code=90 90 90 90 eb c3 90 90 90 90 90 90 00 00 00 00 56 54 46 00 <90> 90 eb 
ac 90 90 90 90 90 90 90 90 90 90 90 90 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  -------------------------------------

  
  host kernel 5.4.0-84-generic
    gust kernel 5.4.0-84-generic: OK
    gust kernel 5.13.0-1012-oem : OK

  host kernel 5.13.0-1012-oem
    gust kernel 5.4.0-84-generic: NG
    gust kernel 5.13.0-1012-oem : OK

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: qemu-system-x86 1:4.2-3ubuntu6.17
  ProcVersionSignature: Ubuntu 5.4.0-84.94-generic 5.4.133
  Uname: Linux 5.4.0-84-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.20
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Mon Sep 20 14:05:09 2021
  ExecutablePath: /usr/bin/qemu-system-x86_64
  InstallationDate: Installed on 2021-09-20 (0 days ago)
  InstallationMedia: Ubuntu-Server 20.04.2 LTS "Focal Fossa" - Release amd64 
(20210201.2)
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Lsusb-t:
   /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
       |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 
480M
  MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
  ProcEnviron: PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-84-generic 
root=/dev/mapper/vg-lv_root ro intel_iommu=on amd_iommu=on
  SourcePackage: qemu
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/06/2015
  dmi.bios.vendor: EFI Development Kit II / OVMF
  dmi.bios.version: 0.0.0
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-q35-4.2
  dmi.modalias: 
dmi:bvnEFIDevelopmentKitII/OVMF:bvr0.0.0:bd02/06/2015:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-4.2:cvnQEMU:ct1:cvrpc-q35-4.2:
  dmi.product.name: Standard PC (Q35 + ICH9, 2009)
  dmi.product.version: pc-q35-4.2
  dmi.sys.vendor: QEMU

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