[jdk21u-dev] RFR: 8324280: RISC-V: Incorrect implementation in VM_Version::parse_satp_mode

[Gui Cao]

Hi, The same issue also exists in the JDK21U: I can reproduce it locally and use this clean patch can fix that issue, So I would like to backport this to JDK21U. The parse_satp_mode function is used to parse SATP. Use SATP (Supervised Address Translation and Protection) mode at JVM startup and explicitly warn and stop early when sv57 is enabled [1]. Tier1 tested with fastdebug build using qemu systems. This is a risc-v specific change. Backport is clean, risk is low.

[1] https://github.com/openjdk/jdk/pull/11388

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Commit messages:
 - Backport e7fdac9d5ce56d2f589df59a7fd2869e35ba2991

Changes: https://git.openjdk.org/jdk21u-dev/pull/218/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=218&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324280
  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/218.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/218/head:pull/218

PR: https://git.openjdk.org/jdk21u-dev/pull/218