[Qemu-devel] [Bug 1502934] Re: QEMU does not start when kvm enabled (SMM issue?)

[Paolo Bonzini]

This is a KVM bug, not a QEMU bug. It only happens with ept=1 and
unrestricted_guest=0. A workaround is to disable SMM in QEMU (-machine
smm=off) or to set kvm_intel's ept parameter to 0.

I'm closing the bug here because it is the wrong tracker (also I know
about it, can reproduce, and hope to provide a fix later this week).

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

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https://bugs.launchpad.net/bugs/1502934

Title:
  QEMU does not start when kvm enabled (SMM issue?)

Status in QEMU:
  Invalid

Bug description:
  Hi!

  QEMU stopped working after "[355023f2010c4df619d88a0dd7012b4b9c74c12c]
  pc: add SMM property" on my server. It says "Guest has not initialized
  the display (yet)." and nothing happens. But only if I use -enable-
  kvm.

  However, the problem gone after I hardcoded
  pc_machine_is_smm_enabled() to always return false (but I have little
  to no understanding of what SMM really is).

  CMD line that reproduces the issue: qemu-system-x86_64 -enable-kvm
  -display curses . It doesn't work the server, but works perfectly on
  my laptop :(.

  I'm using Arch Linux with all updates.
  Some info:
  Linux machine 4.2.2-1-ARCH #1 SMP PREEMPT Tue Sep 29 22:21:33 CEST 2015 
x86_64 GNU/Linux
  Qemu-2.4.0 (tried HEAD as well)
  CPU: Intel(R) Core(TM) i7 CPU         950  @ 3.07GHz
  Some messages from dmesg, just in case:
  [    6.996297] kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL does not work 
properly. Using workaround
  [ 6381.722990] kvm: zapping shadow pages for mmio generation wraparound

  
  I'm more than happy to provide additional  information if needed.

  Cheers,
  Alex

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