Hi Laurent, On Thu, 17 Nov 2016 21:22:33 +0100 Laurent Vivier <lviv...@redhat.com> wrote:
> On 16/11/2016 15:17, Greg Kurz wrote: > > On Wed, 16 Nov 2016 14:17:47 +0100 > > Thomas Huth <th...@redhat.com> wrote: > > > >> On 16.11.2016 13:37, Greg Kurz wrote: > >>> On Wed, 16 Nov 2016 12:24:50 +0000 > >>> "Dr. David Alan Gilbert" <dgilb...@redhat.com> wrote: > >>> > >>>> * Greg Kurz (gr...@kaod.org) wrote: > >>>>> On Wed, 16 Nov 2016 09:39:31 +0100 > >>>>> Thomas Huth <th...@redhat.com> wrote: > >>>>> > >>>>>> The ppc64 postcopy test does not work with KVM-PR, and it is also > >>>>>> causing annoying warning messages when run on a x86 host. So let's > >>>>>> use KVM here only if we know that we're running with KVM-HV (which > >>>>>> automatically also means that we're running on a ppc64 host), and > >>>>>> fall back to TCG otherwise. > >>>>>> > [..] > > The changes to the code look ok and I prefer to spend time chasing the > > KVM PR issue rather than arguing on a comment... > > For the problem itself, it seems to appear only after a > BOOK3S_INTERRUPT_SYSCALL interrupt for an KVM_EXIT_PAPR_HCALL > (H_PUT_TERM_CHAR). In this case, KVM has to exit to QEMU to manage the > output. The following interrupt is always an BOOK3S_INTERRUPT_PROGRAM > with an emulation failure. > Which specific problem are you referring to ? On my side, when running postcopy-test in a nested guest, I hit either one of the three following issues (in decreasing order of probability of occurence): 1) "Memory content inconsistency at ..." like Stefan 2) "Unexpected 32 on dest_serial serial" accompanied by the following in dmesg [131613.428616] Couldn't emulate instruction 0x00000000 (op 0 xop 0) [131613.503515] kvmppc_handle_exit_pr: emulation at d8 failed (00000000) 3) hang because the destination QEMU is looping on: ioctl(19, KVM_RUN, 0) = 2 (RESUME_HOST) Host runs OpenPower HostOS (kernel 4.9, QEMU 2.7) and guest runs fedora25. Cheers. -- Greg > Laurent
