[PATCH v2 04/14] arm64: Mark all I/O as non-secure shared

Steven Price
2024-04-12T08:42:31Z

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@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/include/asm/io.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 8d825522c55c..f283c764ea20 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -145,12 +145,12 @@ extern void __memset_io(volatile void __iomem *, int, size_t);

#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
--
2.34.1