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[Bug 1811862] Re: microcode version stays 0x1 even if -cpu host is used

From: Thomas Huth
Subject: [Bug 1811862] Re: microcode version stays 0x1 even if -cpu host is used
Date: Tue, 19 Jan 2021 06:56:29 -0000

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Or mark it as "Fix Released" if the problem has been solved with a 
newer version of QEMU already. Thank you and sorry for the inconvenience.

** Changed in: qemu
       Status: New => Incomplete

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  microcode version stays 0x1 even if -cpu host is used

Status in QEMU:

Bug description:
  The microcode version of my host cpu has the following version:

  grep microcode /proc/cpuinfo | head -1
  microcode       : 0x3d

  while trying to run ESXi in an nested VM, the boot bailed out with
  error message that at least microcode version 0x19 is needed. It 
  seems they have introduced such a check on certain CPU types.

  The VM in question is using the "host-passthrough" option in libvirt
  and the qemu command line reads as this:

  21172 ?        Sl     0:09 /usr/libexec/qemu-kvm -name guest=hpe-env-
  client1,debug-threads=on -S -object
  -hpe-env-client1/master-key.aes -machine pc-i440fx-
  rhel7.6.0,accel=kvm,usb=off,dump-guest-core=off -cpu host <rest

  Running a regular Linux VM with `host-passthrough` shows that the
  microcode version is still reported as 0x1.

  Within the VM:

  [root@hpe-env-client1 ~]# cat /proc/cpuinfo 
  processor       : 0
  vendor_id       : GenuineIntel
  cpu family      : 6
  model           : 63
  model name      : Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
  stepping        : 2
  microcode       : 0x1
  cpu MHz         : 2397.222

  My impression is qemu should copy the hosts microcode version in this case?

  Running Qemu von RHEl8 beta here.

  [root@3parserver ~]# /usr/libexec/qemu-kvm --version
  QEMU emulator version 2.12.0 (qemu-kvm-2.12.0-41.el8+2104+3e32e6f8)

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