[Qemu-devel] [Bug 1505062] [NEW] Regression: QEMU 2.4 on Linux 4.2 fails to init display with SMM enabled

[Alex]

Public bug reported:

QEMU version: 2.4, also tested b37686f (2015-10-09 12:18:13 +0100) not working. 
Requires KVM and SDL, possibly others.
Kernel version: 4.1 working, 4.2 not working.
Architecture: x86_64
Target: x86_64, also tested i386 not working.

Step 0: Install versions listed above.
Step 1: Run "qemu-system-$TARGET -enable-kvm"
Step 2: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.3"
Step 3: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.4"
Step 4: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.3,smm=on"
Step 5: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.4,smm=off"
Step 6: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.3"
Step 7: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.4"
Step 8: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.3,smm=on"
Step 9: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.4,smm=off"

Expected behavior: All 8 invocations result in an rectangular SDL window
showing a framebuffer showing failure to locate a boot device.

Actual behavior: Invocations corresponding to steps 2, 4, 5, 6, 8, and 9
(i.e. those using 2.4 and *not* smm=off) behave as expected, however
those in steps 1, 3, and 7 result in a square black SDL window with no
text. Note that step 1 is more or less the "default configuration" for
QEMU with KVM.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1505062

Title:
  Regression: QEMU 2.4 on Linux 4.2 fails to init display with SMM
  enabled

Status in QEMU:
  New

Bug description:
  QEMU version: 2.4, also tested b37686f (2015-10-09 12:18:13 +0100) not 
working. Requires KVM and SDL, possibly others.
  Kernel version: 4.1 working, 4.2 not working.
  Architecture: x86_64
  Target: x86_64, also tested i386 not working.

  Step 0: Install versions listed above.
  Step 1: Run "qemu-system-$TARGET -enable-kvm"
  Step 2: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.3"
  Step 3: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.4"
  Step 4: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.3,smm=on"
  Step 5: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-i440fx-2.4,smm=off"
  Step 6: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.3"
  Step 7: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.4"
  Step 8: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.3,smm=on"
  Step 9: Run "qemu-system-$TARGET -enable-kvm -nodefaults -vga std -machine 
pc-q35-2.4,smm=off"

  Expected behavior: All 8 invocations result in an rectangular SDL
  window showing a framebuffer showing failure to locate a boot device.

  Actual behavior: Invocations corresponding to steps 2, 4, 5, 6, 8, and
  9 (i.e. those using 2.4 and *not* smm=off) behave as expected, however
  those in steps 1, 3, and 7 result in a square black SDL window with no
  text. Note that step 1 is more or less the "default configuration" for
  QEMU with KVM.

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