[PATCH v4 05/15] arm64: Mark all I/O as non-secure shared

[Steven Price <steven.price@xxxxxxx>]

All I/O is by default considered non-secure for realms. As such
mark them as shared with the host.

Co-developed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
Changes since v3:
 * Add PROT_NS_SHARED to FIXMAP_PAGE_IO rather than overriding
   set_fixmap_io() with a custom function.
 * Modify ioreamp_cache() to specify PROT_NS_SHARED too.
---
 arch/arm64/include/asm/fixmap.h | 2 +-
 arch/arm64/include/asm/io.h     | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
index 87e307804b99..f2c5e653562e 100644
--- a/arch/arm64/include/asm/fixmap.h
+++ b/arch/arm64/include/asm/fixmap.h
@@ -98,7 +98,7 @@ enum fixed_addresses {
 #define FIXADDR_TOT_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
 #define FIXADDR_TOT_START	(FIXADDR_TOP - FIXADDR_TOT_SIZE)
 
-#define FIXMAP_PAGE_IO     __pgprot(PROT_DEVICE_nGnRE)
+#define FIXMAP_PAGE_IO     __pgprot(PROT_DEVICE_nGnRE | PROT_NS_SHARED)
 
 void __init early_fixmap_init(void);
 
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 4ff0ae3f6d66..07fc1801c6ad 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -277,12 +277,12 @@ static inline void __const_iowrite64_copy(void __iomem *to, const void *from,
 
 #define ioremap_prot ioremap_prot
 
-#define _PAGE_IOREMAP PROT_DEVICE_nGnRE
+#define _PAGE_IOREMAP (PROT_DEVICE_nGnRE | PROT_NS_SHARED)
 
 #define ioremap_wc(addr, size)	\
-	ioremap_prot((addr), (size), PROT_NORMAL_NC)
+	ioremap_prot((addr), (size), (PROT_NORMAL_NC | PROT_NS_SHARED))
 #define ioremap_np(addr, size)	\
-	ioremap_prot((addr), (size), PROT_DEVICE_nGnRnE)
+	ioremap_prot((addr), (size), (PROT_DEVICE_nGnRnE | PROT_NS_SHARED))
 
 /*
  * io{read,write}{16,32,64}be() macros
@@ -303,7 +303,7 @@ static inline void __iomem *ioremap_cache(phys_addr_t addr, size_t size)
 	if (pfn_is_map_memory(__phys_to_pfn(addr)))
 		return (void __iomem *)__phys_to_virt(addr);
 
-	return ioremap_prot(addr, size, PROT_NORMAL);
+	return ioremap_prot(addr, size, PROT_NORMAL | PROT_NS_SHARED);
 }
 
 /*
-- 
2.34.1