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Re: [Xen-devel] [PATCH V3 3/3] x86/altp2m: fix display frozen when switching to a new view early

On Mon, Oct 29, 2018 at 6:41 AM Razvan Cojocaru
<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;
> * modifies p2m_change_entry_type_global(), p2m_memory_type_changed
>   and p2m_change_type_range() to propagate their changes to all
>   valid altp2ms.
> Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> Suggested-by: George Dunlap <george.dunlap@xxxxxxxxxx>

Tested-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>

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