arm64: mte: Map hotplugged memory as Normal Tagged
In a system supporting MTE, the linear map must allow reading/writing allocation tags by setting the memory type as Normal Tagged. Currently, this is only handled for memory present at boot. Hotplugged memory uses Normal non-Tagged memory. Introduce pgprot_mhp() for hotplugged memory and use it in add_memory_resource(). The arm64 code maps pgprot_mhp() to pgprot_tagged(). Note that ZONE_DEVICE memory should not be mapped as Tagged and therefore setting the memory type in arch_add_memory() is not feasible. Signed-off-by:Catalin Marinas <catalin.marinas@arm.com> Fixes: 0178dc76 ("arm64: mte: Use Normal Tagged attributes for the linear map") Reported-by:
Patrick Daly <pdaly@codeaurora.org> Tested-by:
Patrick Daly <pdaly@codeaurora.org> Link: https://lore.kernel.org/r/1614745263-27827-1-git-send-email-pdaly@codeaurora.org Cc: <stable@vger.kernel.org> # 5.10.x Cc: Will Deacon <will@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: David Hildenbrand <david@redhat.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Reviewed-by:
Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by:
Anshuman Khandual <anshuman.khandual@arm.com> Link: https://lore.kernel.org/r/20210309122601.5543-1-catalin.marinas@arm.com Signed-off-by:
Will Deacon <will@kernel.org>
parent
86c83365
Please register or sign in to comment