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[RFC,0/3] x86: fix cpu hotplug with secure boot

Message ID 20200710161704.309824-1-imammedo@redhat.com
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Series x86: fix cpu hotplug with secure boot | expand

Message

Igor Mammedov July 10, 2020, 4:17 p.m. UTC 
CPU hotplug with Secure Boot was not really supported and firmware wasn't aware
of hotplugged CPUs (which might lead to guest crashes). During 4.2 we introduced
locked SMI handler RAM arrea to make sure that guest OS wasn't able to inject
its own SMI handler and OVMF added initial CPU hotplug support.

This series is QEMU part of that support [1] which lets QMVF tell QEMU that
CPU hotplug with SMI broadcast enabled is supported so that QEMU would be able
to prevent hotplug in case it's not supported and trigger SMI on hotplug when
it's necessary. 

1) CPU hotplug negotiation part was introduced later so it might not be
in upstream OVMF yet or I might have missed the patch on edk2-devel
(Laszlo will point out to it/post formal patch)

Igor Mammedov (3):
  x86: lpc9: let firmware negotiate CPU hotplug SMI feature
  x86: cphp: prevent guest crash on CPU hotplug when broadcast SMI is in
    use
  x68: acpi: trigger SMI before scanning for hotplugged CPUs

 include/hw/acpi/cpu.h  |  1 +
 include/hw/i386/ich9.h |  1 +
 hw/acpi/cpu.c          |  6 ++++++
 hw/acpi/ich9.c         | 12 +++++++++++-
 hw/i386/acpi-build.c   | 33 ++++++++++++++++++++++++++++++++-
 hw/i386/pc.c           | 15 ++++++++++++++-
 hw/isa/lpc_ich9.c      | 10 ++++++++++
 7 files changed, 75 insertions(+), 3 deletions(-)