[Bug 1915063] Re: Windows 10 wil not install using qemu-system-x86_64

[Christian Ehrhardt ]

That is awesome David,
qemu64 is like a very low common denominator with only very basic CPU features.
While "copy host" means "enable all you can".

We can surely work with that a bit, but until I get access to the same
HW I need you to do it.


If you run in a console `$virsh domcapabilities` it will spew some XML at you. 
One of the sections will be for "host-model". In my case that looks like

    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Skylake-Client-IBRS</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='hypervisor'/>
...
    </mode>


That means a names CPU type (the one that is closest to what you have) and some 
feature additionally enabled/disabled.

If you could please post the full output you have, that can be useful.
>From there you could go two steps.
1. as you see in my example it will list some cpu features on top of the named 
type.
   If you remove them one by one you might be able to identify the single-cpu 
featute
   that breaks in your case.
2. The named CPU that you have also has a representation, it can be found in
   /usr/share/libvirt/cpu_map...
   That ill list all the CPU features that make up the named type.
   If #1 wasn't sufficient, you can now add those to your guest definition one 
by one in disabled 
   state, example
    <feature policy='disable' name='ss'/>

A description of the underlying mechanism is here
https://libvirt.org/formatdomain.html#cpu-model-and-topology

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https://bugs.launchpad.net/bugs/1915063

Title:
  Windows 10 wil not install using qemu-system-x86_64

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce
  install virt-manager and ovmf if nopt already there
  copy windows and virtio iso files to /var/lib/libvirt/images

  Use virt-manager from local machine to create your VMs with the disk, CPUs 
and memory required
      Select customize configuration then select OVMF(UEFI) instead of seabios
      set first CDROM to the windows installation iso (enable in boot options)
      add a second CDROM and load with the virtio iso
        change spice display to VNC

    Always get a security error from windows and it fails to launch the 
installer (works on RHEL and Fedora)
  I tried updating the qemu version from Focals 4.2 to Groovy 5.0 which was of 
no help
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  DistributionChannelDescriptor:
   # This is the distribution channel descriptor for the OEM CDs
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   
canonical-oem-sutton-focal-amd64-20201030-422+pc-sutton-bachman-focal-amd64+X00
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2021-01-20 (19 days ago)
  InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 
20201030-14:39
  MachineType: LENOVO 30E102Z
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.6.0-1042-oem 
root=UUID=389cd165-fc52-4814-b837-a1090b9c2387 ro locale=en_US quiet splash 
vt.handoff=7
  ProcVersionSignature: Ubuntu 5.6.0-1042.46-oem 5.6.19
  RelatedPackageVersions:
   linux-restricted-modules-5.6.0-1042-oem N/A
   linux-backports-modules-5.6.0-1042-oem  N/A
   linux-firmware                          1.187.8
  RfKill:
   
  Tags:  focal
  Uname: Linux 5.6.0-1042-oem x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker kvm libvirt lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 07/29/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: S07KT08A
  dmi.board.name: 1046
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrS07KT08A:bd07/29/2020:svnLENOVO:pn30E102Z:pvrThinkStationP620:rvnLENOVO:rn1046:rvrNotDefined:cvnLENOVO:ct3:cvrNone:
  dmi.product.family: INVALID
  dmi.product.name: 30E102Z
  dmi.product.sku: LENOVO_MT_30E1_BU_Think_FM_ThinkStation P620
  dmi.product.version: ThinkStation P620
  dmi.sys.vendor: LENOVO

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