Re: [Xen-devel] [PATCH 2/3 Xen-4.9] x86/dom0: Fix shadowing of PV guests with 2M superpages

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.11.18 at 16:26, <andrew.cooper3@xxxxxxxxxx> wrote:
> This is a straight backport of c/s 28d9a9a2d41759b9e5163037b759ac557aea767c
> but with a different justification.
> 
> Dom0 may have superpages (e.g. initial P2M), and may be shadowed
> (e.g. PV-L1TF).  Because of this incorrect check, when PV superpages are
> disallowed (which is the security supported configuration), attempting to
> shadow the P2M with its superpages still intact will fail.  A #PF will be
> handed back to the kernel, rather than the superpage being splintered and
> shadowed.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

It being a straight backport, tags from the original commit should
perhaps be retained?

Jan



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