Oleksandr Tyshchenko 5e1cdb8ee5 arm/xen: Switch to use gnttab_setup_auto_xlat_frames() for DT ... Read the start address of the grant table space from DT (region 0). This patch mostly restores behaviour before commit 3cf4095d74 ("arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table") but trying not to break the ACPI support added after that commit. So the patch touches DT part only and leaves the ACPI part with xen_xlate_map_ballooned_pages(). Also in order to make a code more resilient use a fallback to xen_xlate_map_ballooned_pages() if grant table region wasn't found. This is a preparation for using Xen extended region feature where unused regions of guest physical address space (provided by the hypervisor) will be used to create grant/foreign/whatever mappings instead of wasting real RAM pages from the domain memory for establishing these mappings. The immediate benefit of this change: - Avoid superpage shattering in Xen P2M when establishing stage-2 mapping (GFN <-> MFN) for the grant table space - Avoid wasting real RAM pages (reducing the amount of memory usuable) for mapping grant table space - The grant table space is always mapped at the exact same place (region 0 is reserved for the grant table) Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/1639080336-26573-3-git-send-email-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>		2022-01-06 09:53:31 +01:00
..
enlighten.c	arm/xen: Switch to use gnttab_setup_auto_xlat_frames() for DT	2022-01-06 09:53:31 +01:00
grant-table.c	xen: re-introduce support for grant v2 interface	2017-11-06 15:50:17 -05:00
hypercall.S	xen: allow pv-only hypercalls only with CONFIG_XEN_PV	2021-11-02 08:11:01 -05:00
Makefile	xen/efi: have a common runtime setup function	2019-10-02 10:31:07 -04:00
mm.c	xen/swiotlb: check if the swiotlb has already been initialized	2021-05-14 15:52:11 +02:00
p2m.c	Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF}	2021-03-10 16:39:29 -06:00