On Fri, Apr 24, 2026 at 05:48:37PM +0200, John Paul Adrian Glaubitz wrote: > On Fri, 2026-04-24 at 16:47 +0200, Christian Zigotzky wrote: > > I compiled it with "mtune=power4" today but without any success. > > > > Error messages: > > > > [ 800.274759] Couldn't emulate instruction 0x00000000 (op 0 xop 0) > > [ 800.274767] kvmppc_exit_pr_progint: emulation at 100 failed (00000000) > > What exactly are you running inside the KVM? 0x00000000 doesn't seem like > a valid instruction and a quick Google research reveals that this triggers > a SIGLL trap.
By definition anything with primary op 0 (the first six bits 0) is invalid. It isn't super unusual to (accidentally) try to execute a zero as an instruction ;-) Segher
