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

[Feilong Jiang]

On Mon, 8 Apr 2024 17:15:28 GMT, Gui Cao <gcao 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?

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PR Review Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/19#discussion_r1557214205