n Thu, Feb 06, 2003 at 02:52:03PM -0500, Daniel Jarboe wrote: > Adam Thornton wrote: > > None. A plain old system will run just fine under VM. All the > > VM-specific patches are optimizations you can apply if you happen to > > know you're running under VM. But VM does virtualize the > > machine, so if > > it will run on the iron, it will run under VM. > > Just checking in, I assume the converse is not true? The VM-specific > patches/optimizations out there tend to break LPAR/Iron installations?
The only one I can think of that might would be the notimer patch; I have no idea how, or if, it runs on the iron rather than under VM. The rest of them....well, obviously if your kernel has a VM Reader IPL record burned in and you have no reader (would it work with a real card deck?) that's not going to work very well, although I don't know if it would really matter if it IPLed from DASD anyway. As far as support for DIAG reserved minidisks, well, you just won't use that subsystem, so it bloats the kernel uselessly a little, but it doesn't really hurt. Likewise, if you compiled the cpint kernel module it would be spectacularly useless, but it wouldn't hurt anybody. I probably won't get a chance anytime soon, but it might be fun to take the notimer-Linux guest from a VM-under-Herc setup (perfectly legal--Hercules is running on the H70 that we have z/VM licensed to), dump his minidisks to Herc emulated volumes, and see if I can IPL Herc from those disks. Adam
