Re: KVM-PR no longer works when compiled with new GCC compilers

From	Segher Boessenkool <segher@kernel.crashing.org>
Newsgroups	linux.debian.ports.powerpc
Subject	Re: KVM-PR no longer works when compiled with new GCC compilers
Date	2026-04-25 05:30 +0200
Message-ID	<MNBSp-cM9-1@gated-at.bofh.it> (permalink)
References	(1 earlier) <MN5IS-hqCU-7@gated-at.bofh.it> <MN6bT-hqOK-1@gated-at.bofh.it> <MN6lz-hqSP-3@gated-at.bofh.it> <MNq0V-4DW-15@gated-at.bofh.it> <MNqWZ-5hh-1@gated-at.bofh.it>
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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

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Thread

KVM-PR no longer works when compiled with new GCC compilers Christian Zigotzky <chzigotzky@xenosoft.de> - 2025-10-02 08:40 +0200
  Re: KVM-PR no longer works when compiled with new GCC compilers Christophe Leroy <christophe.leroy@csgroup.eu> - 2025-10-02 10:40 +0200
  KVM-PR no longer works when compiled with new GCC compilers Christian Zigotzky <chzigotzky@xenosoft.de> - 2026-04-23 19:10 +0200
    Re: KVM-PR no longer works when compiled with new GCC compilers John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2026-04-23 19:40 +0200
      Re: KVM-PR no longer works when compiled with new GCC compilers Christian Zigotzky <chzigotzky@xenosoft.de> - 2026-04-23 19:50 +0200
        Re: KVM-PR no longer works when compiled with new GCC compilers Christian Zigotzky <chzigotzky@xenosoft.de> - 2026-04-24 16:50 +0200
          Re: KVM-PR no longer works when compiled with new GCC compilers John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2026-04-24 17:50 +0200
            Re: KVM-PR no longer works when compiled with new GCC compilers Segher Boessenkool <segher@kernel.crashing.org> - 2026-04-25 05:30 +0200

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