[PATCH v5 12/19] efi: arm64: Map Device with Prot Shared
From: Steven Price <steven.price@arm.com>
Date: 2024-08-19 13:20:32
Also in:
kvm, kvmarm, linux-arm-kernel, lkml
Subsystem:
arm64 port (aarch64 architecture), extensible firmware interface (efi), the rest · Maintainers:
Catalin Marinas, Will Deacon, Ard Biesheuvel, Linus Torvalds
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> --- Changes since v4: * Reworked to use arm64_is_iomem_private() to decide whether the memory needs to be decrypted or not. --- arch/arm64/kernel/efi.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 712718aed5dd..95f8e8bf07f8 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c@@ -34,8 +34,16 @@ static __init pteval_t create_mapping_protection(efi_memory_desc_t *md) u64 attr = md->attribute; u32 type = md->type; - if (type == EFI_MEMORY_MAPPED_IO) - return PROT_DEVICE_nGnRE; + if (type == EFI_MEMORY_MAPPED_IO) { + pgprot_t prot = __pgprot(PROT_DEVICE_nGnRE); + + if (arm64_is_iomem_private(md->phys_addr, + md->num_pages << EFI_PAGE_SHIFT)) + prot = pgprot_encrypted(prot); + else + prot = pgprot_decrypted(prot); + return pgprot_val(prot); + } if (region_is_misaligned(md)) { static bool __initdata code_is_misaligned;
--
2.34.1