Re: [Xen-devel] [PATCH] mm: fix LLVM code-generation issue

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.11.18 at 12:23, <roger.pau@xxxxxxxxxx> wrote:
> Image an AP reads system_state < SYS_STATE_active, then BSP sets
> system_state = SYS_STATE_active and clears the init mappings, then
> when the AP tries to read an init variable it would get a page fault.

As said before - APs are supposed to be quiescent during this
particular transition of system_state, and the idle scrubbing added
an exception to that rule. I don't see why such an exception may
not involve exceptional treatment on the particular reading path.
Furthermore APs, which may also be brought up at run time, may
never ever touch init mappings of any kind.

Jan



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