On Fri, Nov 02, 2007 at 05:23:59PM +0100, Jocelyn Mayer wrote: > No, it's not accidental. An application accessing priviledged SPR, > including the PVR, is likely to be buggy. I checked in the kernel > (2.6.23), trapping the mfpvr instruction is a huge bug because it breaks > the virtualisation features of the PowerPC architecture. Application > like mol will suffer of this, not being able to pretend the virtualized > CPU is not the same as the host CPU. The PowerPC architecture has been > designed to be fully virtualisable but the vanilla Linux kernel breaks > this useful feature. The bug is then to be fixed in the kernel (and the > glibc if it really uses mfpvr).
I suggest you take this up with the PowerPC kernel maintainers, which might work, instead of making QEMU noisy about it; the people using QEMU don't care, and they'll just disable the warning. It wasn't an accidental decision on the kernel maintainers' part either. I don't see the PVR read in current glibc, but I thought it was there; I don't remember exactly what happened. -- Daniel Jacobowitz CodeSourcery
