====== KVM ======

===== CPU model =====

[[https://qemu-project.gitlab.io/qemu/system/qemu-cpu-models.html|QEMU / KVM CPU model configuration]]

===== AES =====

Enable AES in CPU flags. Default KVM64 CPU doesn't expose AES flag.
Simple openssl benchmark:
<code bash>
openssl speed -evp aes-128-cbc aes-256-cbc aes-256-ecb

# Without AES
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes  16384 bytes
aes-256 cbc     185216.65k   190818.37k   191588.35k   193247.23k   193489.58k   193353.05k
aes-128-cbc     220375.57k   245515.09k   249103.70k   254411.43k   255770.62k   255393.79k


# With AES
type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes  16384 bytes
aes-256 cbc     183729.40k   191020.12k   190906.71k   193176.58k   193333.93k   194065.47k
aes-128-cbc     587427.84k  1272103.38k  1317980.93k  1329665.71k  1332060.16k  1332663.64k
</code>




==== DRAFT ====
Fastest method: create Proxmox machine and import vbox hard discs to newly created Proxmox VM.

No VirtualBox preparation, no IDE drivers. Just import discs to new machine.
  * Create new Proxmox machine with similar parameters to old one
    * [[https://pve.proxmox.com/wiki/Windows_10_guest_best_practices|Windows 10 guest best practices]]
    * Do not remove created Hard Disc (scsi0) - it will be used to trigger Windows to install SCSI drivers.
  * Import disc images (repeat for all VDI discs)
    * As RAW images with all benefits (compression, thin provisioning, snapshots) of ''local-zfs'' storage: <code bash>qm importdisk 701 WIN7_C.vdi local-zfs</code>
      * 21743 MB VDI compacted file occupied 15,2G on ZFS with compression ratio 1.24x
    * As QCOW2 files on every file storage: <code bash>qm importdisk 701 WIN7_C.vdi local -format qcow2</code>
  * Connect new discs into machine:
    * <code bash>qm set 701 --scsi<N> local-zfs:vm-701-disk-<N>,discard=on,size=64G</code>
    * NOTE: ''discard=on'' should be enabled for thin provisioned storage to reclaim unused space
  * Edit config file to change just connected discs from SCSI to IDE. Remember to update CDROM IDE number to do not be in conflict with new discs.
    * <code bash>sed -i 's/scsi/ide/g' /etc/pve/qemu-server/702.conf</code>
    * <file | /etc/pve/qemu-server/702.conf>
ide0: local-zfs:vm-702-disk-1,discard=on,size=64G
ide1: local-zfs:vm-702-disk-2,discard=on,size=64g
ide2: local-zfs:vm-702-disk-3,discard=on,size=8G
ide3: nas326-ISOs:iso/virtio-win-0.1.173.iso,media=cdrom,size=384670K
scsi0: local-zfs:vm-702-disk-0,discard=on,size=32G
scsihw: virtio-scsi-pci
</file>
  * Setup correct boot order
  * Start Windows 10
    * Windows should load correctly
    * Go to ''Device Manager'' and install missing drivers. See [[vm:proxmox:kvm:virtio_drivers|Virtio drivers]]
    * Shutdown system
  * Edit config file to change IDE discs to SCSI
  * Setup correct boot order
  * Start Windows 10
  * ERROR: Windows stuck during booting when VirtIO SCSI driver.
    * It is known KVM issue with VirtIO SCSI driver when more than 1 CPU core is used! 
       * [[https://bugzilla.redhat.com/show_bug.cgi?id=1670673]]
       * Driver version 61.77.104.17200 2019-06-07 from virtio iso v 1.1.172       
       * Update to latest 61.80.104.17300 2019-08-12 (not stable) virtio iso v1.1.173 doesn't help
    * Changing CPU to 1 core solves problem.
    * It works with odd number of cores (1,3,5)



    * Windows will crash (becasue storage driver is not supported). Windows will reboot into repair mode.
    * Provide virtio drivers in virtual cd-rom (latest 1.1.173 was used)
    * Select ''Start-up Repair''



  * Switch SCSI to IDE: <code bash>sed -i 's/scsi/ide/g' /etc/pve/qemu-server/701.conf</code>
    * Manually correct numbering conflict with CD-ROM ide drive
    * Setup correct boot order
  * Add one dummy (small size) hard disc to SCSI controller
  * Enable QEMU Guest Agent
  * Boot Windows, go to ''Device Manager'' and install missing drivers:
...
  * Shutdown machine
  * Switch disc controller from IDE to SCSI. Edit ''/etc/pve/qemu-server/701.conf''
    * Setup correct boot order

sed -i 's/ide/scsi/g' /etc/pve/qemu-server/701.conf