[PATCH v4 10/15] arm64: Force device mappings to be non-secure shared

Steven Price
2024-07-01T09:55:54Z

From: Suzuki K Poulose <suzuki.poulose@arm.com>

Device mappings (currently) need to be emulated by the VMM so must be
mapped shared with the host.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
Changes from v3:
* Make use of pgprot_decrypted() in the definition of pgprot_device()
---
arch/arm64/include/asm/pgtable.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index f5d5f416d47d..a625738ed855 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -648,8 +648,9 @@ static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
#define pgprot_writecombine(prot) \
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
-#define pgprot_device(prot) \
+#define __pgprot_device(prot) \
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN)
+#define pgprot_device(prot) __pgprot_device(pgprot_decrypted(prot))
#define pgprot_tagged(prot) \
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_TAGGED))
#define pgprot_mhp pgprot_tagged
--
2.34.1