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

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Date: Mon,  1 Jul 2024 10:55:01 +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>,
	Steven Price <steven.price@....com>
Subject: [PATCH v4 11/15] efi: arm64: Map Device with Prot Shared

From: Suzuki K Poulose <suzuki.poulose@....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@....com>
Signed-off-by: Steven Price <steven.price@....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