[riscv-port-jdk11u:riscv-port] RFR: 8297697: RISC-V: Add support for SATP mode detection

[Fei Yang]

On Tue, 9 Apr 2024 08:33:22 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

>> Hi,
>> Please review this backport to riscv-port-jdk11u.
>> Backport of [JDK-8297697](https://bugs.openjdk.org/browse/JDK-8297697), and [JDK-8301067](https://bugs.openjdk.org/browse/JDK-8301067). JDK-8301067 only modifies the log description information introduced by JDK-8297697.
>> 
>> After this patch, If it is an unsupported satp.mode , the message will be as follows:
>> 
>> root at qemuriscv64:~/jdk/bin# ./java -version
>> Error occurred during initialization of VM
>> Unsupported satp mode: sv57
>> 
>> root at qemuriscv64:~/jdk/bin# cat /proc/cpuinfo
>> processor       : 0
>> hart            : 0
>> isa             : rv64imafdch_zicbom_zicboz_zicntr_zicsr_zifencei_zihintpause_zihpm_zba_zbb_zbs_sstc
>> mmu             : sv57
>> mvendorid       : 0x0
>> marchid         : 0x0
>> mimpid          : 0x0
>> 
>> 
>> Testing:
>> 
>> - [ ] Run tier1 tests on SOPHON SG2042 (release)
>
> src/hotspot/cpu/riscv/vm_version_riscv.cpp line 44:
> 
>> 42:   // check if satp.mode is supported, currently supports up to SV48(RV64)
>> 43:   if (get_satp_mode() > VM_SV48) {
>> 44:     vm_exit_during_initialization(err_msg("Unsupported satp mode: %s", _vm_mode));
> 
> Looks like [JDK-8301067](https://bugs.openjdk.org/browse/JDK-8301067) was missed?

Good catch!

-------------

PR Review Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/19#discussion_r1557228603