[uml-devel] FPU patches broke UML on i7-7700 CPU

[Natale P. <nat...@gm...>]

Hello,

as I've reported here [1], by changing the work station I've got the
same UML guest not working anymore. I investigated and the problem root
is in the code added in this patchset [2] (add extended processor state
save/restore support). In particular, the ptrace returns < 0 and the
errno is set to 14. Reverting the code to use the functions
*_i387_registers () makes everything to work correctly.

There is something I can do for further debugging the issue? Or should I
live with a modified kernel tree with a reverse patch applied ?

Thank you


[1] https://sourceforge.net/p/user-mode-linux/mailman/message/35663374/
[2] https://sourceforge.net/p/user-mode-linux/mailman/message/34911221/