> On Sat, Oct 31, 2009 at 05:50:57PM -0600, Theo de Raadt wrote: > > > OpenBSD 4.5+ works if "mpbios" is disabled, more info here: > > > http://scie.nti.st/2009/10/4/running-openbsd-4-5-in-kvm-on-ubuntu-linux-9-04 > > > > OpenBSD 4.5 works on 99.9% of PCs out there with mpbios enabled, > > so KVM must have a really stupid bug. > > > > Something about the mpbios implementation on OpenBSD does not seem
Wait. We don't implement MPBIOS. It is a table provided by a machine. That machine is KVM. On all real machines machine, we don't crash. Get it? > right as disabling with 'bsd -c' does not have the same result as > building a kernel with mpbios0 disabled in the config. That and > your 99.9% comment lead me to believe there is a bug in OpenBSD. > Given > 1) Per mpbios.c ACPI and a useable MPBIOS appear to be mutually exclusive That would be false. > 2) New PCs are shipping with ACPI instead of APM What is your point? > 3) GENERIC with mpbios enabled breaks on 0.1% of PCs. No, that is not true. The result we get with KVM does not happen on *any real machine*. > I'm at a bit of a loss as to why mpbios is still enabled in GENERIC. To make you cry, obviously. There couldn't be *any other explanation* could there? > My memory of the brief discussion on the KVM mailing list was that > KVM/QEMU emulation of one of the instructions executed by going through > the mpbios code was mishandled. If you'd like me to find the relevant > thread and forward it on to the mpbios maintainer, I'll gladly do so. MPBIOS is a table given by the hardware. KVM is trying to act as if it is "hardware", but compared to even QEMU, it sucks. > Now to pragmatic considerations. > I understand and appreciate your mistrust of running OpenBSD under > a virtual machine emulator. > But there are folks like me that find it useful to be able to > hold a dog and pony show for a network and cluster design on a > laptop rather than an anvil case of laptops, switches, and routers. That is not what is going on here.
