Re: [Xen-devel] [PATCH RFC] x86/altp2m: fix display frozen when switching to a new view early

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.09.18 at 10:25, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> When an new altp2m view is created very early on guest boot, the
> display will freeze (although the guest will run normally). This
> may also happen on resizing the display. The reason is the way
> Xen currently (mis)handles logdirty VGA: it intentionally
> misconfigures VGA pages so that they will fault.
> 
> The problem is that it only does this in the host p2m. Once we
> switch to a new altp2m, the misconfigured entries will no longer
> fault, so the display will not be updated.
> 
> This patch:
> 
> * updates ept_handle_misconfig() to use the active altp2m instead
>   of the hostp2m;

Wouldn't you, as a prereq to this, first need to make sure global
changes leading to EPT misconfig exits get mirrored to all altp2m-s?
The prime example is p2m_memory_type_changed(), which only
acts on the hostp2m as well.

Jan



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