Re: [Xen-devel] [PATCH v2 1/2] x86/mm: fix a potential race condition in map_pages_to_xen().

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi,

On 11/13/2017 11:06 AM, Jan Beulich wrote:
> > > > On 13.11.17 at 11:34, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:
> > Our debug showed the concerned page->count_info was already(and
> > unexpectedly)
> > cleared in free_xenheap_pages(), and the call trace should be like this:
> >
> > free_xenheap_pages()
> >       ^
> >       |
> > free_xen_pagetable()
> >       ^
> >       |
> > map_pages_to_xen()
> >       ^
> >       |
> > update_xen_mappings()
> >       ^
> >       |
> > get_page_from_l1e()
> >       ^
> >       |
> > mod_l1_entry()
> >       ^
> >       |
> > do_mmu_update()
> This ...
>
> > Is above description convincing enough? :-)
> ... is indeed enough for me to suggest to Julien that we take both
> patches (once they're ready). But it's his decision in the end.
I will wait the series to be ready before giving my release-ack.

Cheers,


> Jan
>
>
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