[PATCH v4 11/15] efi: arm64: Map Device with Prot Shared

Steven Price
2024-07-01T09:55:59Z

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

Device mappings need to be emualted 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>
---
arch/arm64/kernel/efi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 4a92096db34e..ae1ccc8852a4 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -34,7 +34,7 @@ static __init pteval_t create_mapping_protection(efi_memory_desc_t *md)
u32 type = md->type;

if (type == EFI_MEMORY_MAPPED_IO)
- return PROT_DEVICE_nGnRE;
+ return PROT_NS_SHARED | PROT_DEVICE_nGnRE;

if (region_is_misaligned(md)) {
static bool __initdata code_is_misaligned;
--
2.34.1