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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230127112758.37891-13-steven.price@arm.com>
Date:   Fri, 27 Jan 2023 11:27:56 +0000
From:   Steven Price <steven.price@....com>
To:     kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Cc:     Steven Price <steven.price@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        James Morse <james.morse@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Zenghui Yu <yuzenghui@...wei.com>,
        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
Subject: [RFC PATCH 12/14] 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 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