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Re: [PATCH V5 2/3] libxl/arm: Add handling of extended regions for DomU

To: Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>
From: Ian Jackson <iwj@xxxxxxxxxxxxxx>
Date: Wed, 6 Oct 2021 12:34:38 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
Delivery-date: Wed, 06 Oct 2021 11:34:44 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Oleksandr Tyshchenko writes ("[PATCH V5 2/3] libxl/arm: Add handling of 
extended regions for DomU"):
> The extended region (safe range) is a region of guest physical
> address space which is unused and could be safely used to create
> grant/foreign mappings instead of wasting real RAM pages from
> the domain memory for establishing these mappings.

Please forgive me for asking this question now, but: why is this
ARM-specific ?

Ian.

Follow-Ups:
- Re: [PATCH V5 2/3] libxl/arm: Add handling of extended regions for DomU
  - From: Oleksandr

References:
- [PATCH V5 0/3] Add handling of extended regions (safe ranges) on Arm (Was "xen/memory: Introduce a hypercall to provide unallocated space")
  - From: Oleksandr Tyshchenko
- [PATCH V5 2/3] libxl/arm: Add handling of extended regions for DomU
  - From: Oleksandr Tyshchenko

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