Juergen Gross ae0e082687 xen: replace xen_remap() with memremap() ... commit 41925b105e upstream. xen_remap() is used to establish mappings for frames not under direct control of the kernel: for Xenstore and console ring pages, and for grant pages of non-PV guests. Today xen_remap() is defined to use ioremap() on x86 (doing uncached mappings), and ioremap_cache() on Arm (doing cached mappings). Uncached mappings for those use cases are bad for performance, so they should be avoided if possible. As all use cases of xen_remap() don't require uncached mappings (the mapped area is always physical RAM), a mapping using the standard WB cache mode is fine. As sparse is flagging some of the xen_remap() use cases to be not appropriate for iomem(), as the result is not annotated with the __iomem modifier, eliminate xen_remap() completely and replace all use cases with memremap() specifying the MEMREMAP_WB caching mode. xen_unmap() can be replaced with memunmap(). Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/20220530082634.6339-1-jgross@suse.com Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Teddy Astie <teddy.astie@vates.tech> [backport to 5.15.y] Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-07-17 18:30:48 +02:00
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arm	xen: replace xen_remap() with memremap()	2025-07-17 18:30:48 +02:00
interface	xen/mcelog: Add __nonstring annotations for unterminated strings	2025-05-02 07:43:53 +02:00
acpi.h	xen: Remove support for PV ACPI cpu/memory hotplug	2021-04-23 09:31:50 +02:00
balloon.h	xen/balloon: add header guard	2020-09-04 09:59:53 +02:00
events.h	xen/console: harden hvc_xen against event channel storms	2021-12-22 09:32:52 +01:00
features.h
grant_table.h	xen/gnttab: fix gnttab_end_foreign_access() without page specified	2022-03-11 12:22:37 +01:00
hvc-console.h
hvm.h
mem-reservation.h
page.h
platform_pci.h
swiotlb-xen.h	Merge branch 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb	2021-05-04 10:58:49 -07:00
xen-front-pgdir-shbuf.h
xen-ops.h	xen/privcmd: drop "pages" parameter from xen_remap_pfn()	2021-10-05 08:20:27 +02:00
xen.h	ACPI: processor: Fix evaluating _PDC method when running as Xen dom0	2023-05-11 23:00:22 +09:00
xenbus_dev.h
xenbus.h	Xen/gnttab: introduce common INVALID_GRANT_{HANDLE,REF}	2021-03-10 16:39:29 -06:00