[RFC PATCH 12/14] efi: arm64: Map Device with Prot Shared

Steven Price
2023-01-27T11:30:45Z

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 fab05de2e12d..03a876707fc5 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -31,7 +31,7 @@ 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