Re: [Qemu-discuss] s390x user-mode working example

[Thomas Huth]

On 24.11.2017 12:19, Alex Kashchenko wrote:
> Unfortunately, I just found that OpenJDK's JIT requires newer
> instruction set than z900:
> 
> $ ./s390x-linux-user/qemu-s390x
> ~/jdk9/build/linux-s390x-normal-server-release/images/jdk/bin/java -version
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  Internal Error (vm_version_s390.hpp:367), pid=26037, tid=26039
> #  guarantee((_features[0] & GnrlInstrExtFacilityMask) ==
> GnrlInstrExtFacilityMask) failed: We no more support older than z10.

That looks like it is missing the so-called "general instruction
extension facility". You might be lucky - that's one of the extensions
that can already be enabled for testing purposes with the "qemu" CPU:
Try to start QEMU with the "-cpu qemu,ginste=true" parameter.
If it then still complains about missing facilities, try "-cpu help" to
list all recognized feature flags.

The following features can already be enabled with the "qemu" CPU (list
has been copy-n-pasted from the sources, but I hope you'll be able to
map it to the output of "-cpu help", too):

        S390_FEAT_DAT_ENH,
        S390_FEAT_IDTE_SEGMENT,
        S390_FEAT_STFLE,
        S390_FEAT_EXTENDED_IMMEDIATE,
        S390_FEAT_EXTENDED_TRANSLATION_2,
        S390_FEAT_EXTENDED_TRANSLATION_3,
        S390_FEAT_LONG_DISPLACEMENT,
        S390_FEAT_LONG_DISPLACEMENT_FAST,
        S390_FEAT_ETF2_ENH,
        S390_FEAT_STORE_CLOCK_FAST,
        S390_FEAT_MOVE_WITH_OPTIONAL_SPEC,
        S390_FEAT_ETF3_ENH,
        S390_FEAT_COMPARE_AND_SWAP_AND_STORE,
        S390_FEAT_COMPARE_AND_SWAP_AND_STORE_2,
        S390_FEAT_GENERAL_INSTRUCTIONS_EXT,
        S390_FEAT_EXECUTE_EXT,
        S390_FEAT_FLOATING_POINT_SUPPPORT_ENH,
        S390_FEAT_STFLE_45,
        S390_FEAT_STFLE_49,
        S390_FEAT_LOCAL_TLB_CLEARING,
        S390_FEAT_STFLE_53,

 HTH,
  Thomas