[Bug 1888971] [NEW] SMI trigger causes hang with multiple cores

[Naresh GS]

Public bug reported:

When using qemu , SMI trigger causes hang/reboot under following
conditions:

1. No KVM but there are more than 1 threads (-smp > 1)
2. When using KVM.

Info:
qemu-system-x86_64 --version
QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.29)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

SMI trigger was done by writing 0x00 in IO port 0xB2.

Command:
No failure in SMI trigger when using the below command:
qemu-system-x86_64 -M pc-q35-bionic -smp 1 -bios build/coreboot.rom  -serial 
stdio -hda ../linux.img  -m 2048 | tee 1.txt

Hang/resets with below commands:
qemu-system-x86_64 -M pc-q35-bionic -smp 2 -bios build/coreboot.rom  -serial 
stdio -hda ../linux.img  -m 2048 | tee 1.txt

sudo qemu-system-x86_64 -M pc-q35-bionic,accel=kvm -smp 1 -bios
build/coreboot.rom  -serial stdio -hda ../linux.img  -m 2048 | tee 1.txt

** Affects: qemu
     Importance: Undecided
         Status: New

** Description changed:

- When using qemu , SMI trigger causes hand/reboot under following
+ When using qemu , SMI trigger causes hang/reboot under following
  conditions:
  
  1. No KVM but there are more than 1 threads (-smp > 1)
  2. When using KVM.
  
  Info:
  qemu-system-x86_64 --version
  QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.29)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
  
  SMI trigger was done by writing 0x00 in IO port 0xB2.

** Description changed:

  When using qemu , SMI trigger causes hang/reboot under following
  conditions:
  
  1. No KVM but there are more than 1 threads (-smp > 1)
  2. When using KVM.
  
  Info:
  qemu-system-x86_64 --version
  QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.29)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
  
  SMI trigger was done by writing 0x00 in IO port 0xB2.
+ 
+ Command:
+ No failure in SMI trigger when using the below command:
+ qemu-system-x86_64 -M pc-q35-bionic -smp 1 -bios build/coreboot.rom  -serial 
stdio -hda ../linux.img  -m 2048 | tee 1.txt
+ 
+ Hang/resets with below commands:
+ qemu-system-x86_64 -M pc-q35-bionic -smp 2 -bios build/coreboot.rom  -serial 
stdio -hda ../linux.img  -m 2048 | tee 1.txt
+ 
+ sudo qemu-system-x86_64 -M pc-q35-bionic,accel=kvm -smp 1 -bios
+ build/coreboot.rom  -serial stdio -hda ../linux.img  -m 2048 | tee 1.txt

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https://bugs.launchpad.net/bugs/1888971

Title:
  SMI trigger causes hang with multiple cores

Status in QEMU:
  New

Bug description:
  When using qemu , SMI trigger causes hang/reboot under following
  conditions:

  1. No KVM but there are more than 1 threads (-smp > 1)
  2. When using KVM.

  Info:
  qemu-system-x86_64 --version
  QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.29)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

  SMI trigger was done by writing 0x00 in IO port 0xB2.

  Command:
  No failure in SMI trigger when using the below command:
  qemu-system-x86_64 -M pc-q35-bionic -smp 1 -bios build/coreboot.rom  -serial 
stdio -hda ../linux.img  -m 2048 | tee 1.txt

  Hang/resets with below commands:
  qemu-system-x86_64 -M pc-q35-bionic -smp 2 -bios build/coreboot.rom  -serial 
stdio -hda ../linux.img  -m 2048 | tee 1.txt

  sudo qemu-system-x86_64 -M pc-q35-bionic,accel=kvm -smp 1 -bios
  build/coreboot.rom  -serial stdio -hda ../linux.img  -m 2048 | tee
  1.txt

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