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authorCatalin Marinas <catalin.marinas@arm.com>2021-03-09 15:26:01 +0300
committerWill Deacon <will@kernel.org>2021-03-10 13:56:46 +0300
commitd15dfd31384ba3cb93150e5f87661a76fa419f74 (patch)
tree47e8605dd564587b36979ec5d65ee1d78bbb7197 /include/linux/pgtable.h
parent86c83365ab76e4b43cedd3ce07a07d32a4dc79ba (diff)
downloadlinux-d15dfd31384ba3cb93150e5f87661a76fa419f74.tar.xz
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: 0178dc761368 ("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>
Diffstat (limited to 'include/linux/pgtable.h')
-rw-r--r--include/linux/pgtable.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index cdfc4e9f253e..5e772392a379 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -904,6 +904,10 @@ static inline void ptep_modify_prot_commit(struct vm_area_struct *vma,
#define pgprot_device pgprot_noncached
#endif
+#ifndef pgprot_mhp
+#define pgprot_mhp(prot) (prot)
+#endif
+
#ifdef CONFIG_MMU
#ifndef pgprot_modify
#define pgprot_modify pgprot_modify