Hi everyone,
Recently (in d135f781 [1], between v7.0.0 and v8.0.0), qemu-user default
cpu was updated to "max" instead of qemu32/qemu64.
This change "broke" qemu self emulation if this new default cpu is used.
$ ./qemu-x86_64 ./qemu-x86_64 --version
qemu-x86_64: ../util/cacheflush.c:212: init_cache_info: Assertion
`(isize & (isize - 1)) == 0' failed.
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted
By setting cpu back to qemu64, it works again.
$ ./qemu-x86_64 -cpu qemu64 ./qemu-x86_64 --version
qemu-x86_64 version 8.0.50 (v8.0.0-2317-ge125b08ed6)
Copyright (c) 2003-2023 Fabrice Bellard and the QEMU Project developers
Commenting assert does not work, as qemu aligned malloc fail shortly after.
I'm willing to fix it, but I'm not sure what is the issue with "max" cpu
exactly. Is it missing CPU cache line, or something else?
Any guidance would be welcome.
I know it's not the most important problem on earth, but it's still
surprising to meet this when you try to use qemu to emulate itself.
Regards,
Pierrick
[1]
https://gitlab.com/qemu-project/qemu/-/commit/d135f781405f7c78153aa65e0327b05a4aa72e50
