git: kernel - Fix KVM implosion by enabling the IOAPIC

[Matthew Dillon]

commit f0ee34376aa227bbd17f5ccbc846ac30c6177693
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri Aug 28 18:32:43 2020 -0700

    kernel - Fix KVM implosion by enabling the IOAPIC
    
    * We were disabling the IOAPIC universally when running under a VM,
      because older VMs sometimes broke when it was enabled.
    
      However, this can actually implode the virtual machine by causing
      interrupt routing to go haywire.
    
      Add a case statement and always enable the IOAPIC on bare hardware
      and KVM guests.
    
    * Change the default to also enable the IOAPIC on all other VMs.
      Cases can be added for specific disablement if necessary.
    
    * Fixes Google Cloud Environment booting.

Summary of changes:
 sys/platform/pc64/x86_64/machdep.c | 112 ++++++++++++++++++++-----------------
 1 file changed, 62 insertions(+), 50 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f0ee34376aa227bbd17f5ccbc846ac30c6177693


-- 
DragonFly BSD source repository