[crac] RFR: 8373027: [CRaC] [CRIU] x86: FPU xsave area present, but host cpu doesn't support it

[Jan Kratochvil]

On Wed, 3 Dec 2025 15:08:08 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> In some cases (such as AWS `t3.nano` -> `m1.small`) CRIU refuses to restore:
> 
> x86: FPU xsave area present, but host cpu doesn't support it
> 
> 
> I think (based on information of @rvansa `xsave` is not needed for the safepoint of JDK checkpoint/restore.

`glibc.cpu.hwcaps` controls only glibc functions (like `memset` etc.). For example `libavutil` (of `ffmpeg`) is using `cpuid` instruction to select its CPU-optimized code, it is common also in other high performance libraries.

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

PR Comment: https://git.openjdk.org/crac/pull/279#issuecomment-3657097651