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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.11.18 at 14:31, <andrew.cooper3@xxxxxxxxxx> wrote:
> I think Julien's point is that without explicitly barriers, CPU0's
> update to system_state may not be visible on CPU1, even though the
> mappings have been shot down.
> 
> Therefore, from the processors point of view, it did everything
> correctly, and hit a real pagefault.

Boot time updates of system_state should be of no interest here,
as at that time the APs are all idling. The only other update is
during S3 suspend/resume, in that case the mappings have been
removed long ago.

Jan



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