[Qemu-devel] [Bug 1722074] Re: warning: host doesn't support requested feature: CPUID.01H:ECX.vmx

[ Christian Ehrhardt ]

** Also affects: qemu (Ubuntu)
   Importance: Undecided
       Status: New

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

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

** Changed in: qemu
       Status: Opinion => Invalid

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

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https://bugs.launchpad.net/bugs/1722074

Title:
  warning: host doesn't support requested feature: CPUID.01H:ECX.vmx

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

Bug description:
  
  I encountered the bug today (when using qemu to boot up images - which used 
to work on my Intel CPU box):

  warning: host doesn't support requested feature: CPUID.01H:ECX.vmx

  The bug is a show-stopper - I completely cannot load my kernel images
  at all.

  My Ubuntu have this version of QEMU installed:

  qemu-system-x86_64 --version

  QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.16),
  Copyright (c) 2003-2008 Fabrice Bellard

  And PC is a AMD Ryzen7 CPU built, and this is the first time I am
  using it to load QEMU images.   My host information:

  cat /proc/cpuinfo |more

  processor     : 0
  vendor_id     : AuthenticAMD
  cpu family    : 23
  model         : 1
  model name    : AMD Ryzen 7 1700X Eight-Core Processor
  stepping      : 1
  microcode     : 0x800110e
  cpu MHz               : 2200.000
  cache size    : 512 KB
  physical id   : 0
  siblings      : 16
  core id               : 0
  cpu cores     : 8
  apicid                : 0
  initial apicid        : 0
  fpu           : yes
  fpu_exception : yes
  cpuid level   : 13
  wp            : yes
  flags         : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
  pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb 
rdtscp
   lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni 
pclmulqdq
  monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand 
lahf
  _lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch 
osvw s
  kinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_l2 mwaitx 
hw_pstate
  vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni 
xsaveopt
  xsavec xgetbv1 xsaves clzero irperf arat npt lbrv svm_lock nrip_save 
tsc_scale v
  mcb_clean flushbyasid decodeassists pausefilter pfthreshold avic 
overflow_recov
  succor smca
  bugs          : fxsave_leak sysret_ss_attrs null_seg
  bogomips      : 6787.24
  TLB size      : 2560 4K pages
  clflush size  : 64
  cache_alignment       : 64
  address sizes : 48 bits physical, 48 bits virtual
  power management: ts ttp tm hwpstate eff_freq_ro [13] [14]

  processor     : 1
  vendor_id     : AuthenticAMD
  cpu family    : 23
  model         : 1
  model name    : AMD Ryzen 7 1700X Eight-Core Processor
  stepping      : 1
  microcode     : 0x800110e
  cpu MHz               : 2200.000
  cache size    : 512 KB

  From other places, it can be seen that this is an AMD CPU issue:

  https://www.virtualmin.com/node/52227

  not sure?

  The bug will also affect the host negatively:  it will completely go
  into a hung mode - the entire host becomes completely unsable.

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