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Message-Id: <20241017131434.40935-7-steven.price@arm.com>
Date: Thu, 17 Oct 2024 14:14:29 +0100
From: Steven Price <steven.price@....com>
To: kvm@...r.kernel.org,
kvmarm@...ts.linux.dev
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
Catalin Marinas <catalin.marinas@....com>,
Marc Zyngier <maz@...nel.org>,
Will Deacon <will@...nel.org>,
James Morse <james.morse@....com>,
Oliver Upton <oliver.upton@...ux.dev>,
Zenghui Yu <yuzenghui@...wei.com>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Joey Gouly <joey.gouly@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Christoffer Dall <christoffer.dall@....com>,
Fuad Tabba <tabba@...gle.com>,
linux-coco@...ts.linux.dev,
Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
Gavin Shan <gshan@...hat.com>,
Shanker Donthineni <sdonthineni@...dia.com>,
Alper Gun <alpergun@...gle.com>,
"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
Steven Price <steven.price@....com>
Subject: [PATCH v7 06/11] efi: arm64: Map Device with Prot Shared
From: Suzuki K Poulose <suzuki.poulose@....com>
Device mappings need to be emulated by the VMM so must be mapped shared
with the host.
Reviewed-by: Gavin Shan <gshan@...hat.com>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Steven Price <steven.price@....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..1d25d8899dbf 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_protected_mmio(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
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