* Ingo Molnar <mi...@kernel.org> wrote:
> Assuming this does not fix the regression, could you apply the
> minimal patch below - which reverts the old_rsp handling change.
Assuming this solves the regression (it really should, it's now
equivalent to a full revert minus comments):
> @@ -395,6 +398,8 @@ __switch_to(struct task_struct *prev_p, struct
> task_struct *next_p)
> /*
> * Switch the PDA and FPU contexts.
> */
> + prev->usersp = this_cpu_read(old_rsp);
> + this_cpu_write(old_rsp, next->usersp);
> this_cpu_write(current_task, next_p);
>
> /*
can you confirm that your guest (sometimes) uses SYSENTER to do
syscalls?
If yes then my theory is that we broke SYSENTER (or SYSEXIT) support -
and that this would not be visible in our normal tests of KVM because
SYSCALL is used most of the time.
Thanks,
Ingo
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