Bugs item #1952988, was opened at 2008-04-27 18:25
Message generated for change (Comment added) made by mtosatti
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Category: kernel
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Carlo Marcelo Arenas Belon (carenas)
Assigned to: Nobody/Anonymous (nobody)
Summary: in-kernel PIT blocks DragonFlyBSD from booting
Initial Comment:
starting with kvm 64, DragonFlyBSD guests won't be able to boot unless
-no-kvm-pit or -no-kvm-irqchip is used (-no-kvm works as well) :
cpu model: Intel(R) Core(TM)2 CPU
kvm version: kvm 66 (kvm>=64 fails, kvm<=63 works)
host kernel: 2.6.24-gentoo-r4 (SMP)
host arch: x86_64
to replicate, download dragonfly ISO (it is a livecd) and boot from it :
kvm -curses -cdrom dfly-1.12.2_REL.iso -boot d
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Comment By: Marcelo Tosatti (mtosatti)
Date: 2008-04-28 17:30
Message:
Logged In: YES
user_id=2022487
Originator: NO
DragonFlyBSD uses mode 4 of the PIT which the in-kernel emulation
simply ignores.
Mode 4 seems to be similar to one-shot mode, other than the fact
that mode 4 starts counting after the next CLK pulse once programmed,
and mode1 starts counting immediately, so this _should_ be OK:
http://people.redhat.com/~mtosatti/kvm-i8254-mode4.patch
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