[Bug 1888971] Re: SMI trigger causes hang with multiple cores

[Laszlo Ersek (Red Hat)]

Does coreboot do anything to set up an SMI handler? Does it relocate
SMBASE for all processors?

Misbehavior upon raising an SMI is fully expected, unless the guest
(usually the guest firmware) sets up SMI handling properly.

The bug report currently includes only two bits of information about
guest actions, namely "coreboot.rom" and "writing 0x00 in IO port 0xB2".
Thus far a guest crash looks entirely reasonable to me.

Did you intend to attach "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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