linux-kernel - [PATCH v2 04/14] arm64: Mark all I/O as non-secure shared

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Date: Fri, 12 Apr 2024 09:42:03 +0100
From: Steven Price <steven.price@....com>
To: kvm@...r.kernel.org,
	kvmarm@...ts.linux.dev
Cc: Steven Price <steven.price@....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>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	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>
Subject: [PATCH v2 04/14] arm64: Mark all I/O as non-secure shared

All I/O is by default considered non-secure for realms. As such
mark them as shared with the host.

Co-developed-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/arm64/include/asm/io.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 8d825522c55c..f283c764ea20 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -145,12 +145,12 @@ extern void __memset_io(volatile void __iomem *, int, size_t);
 
 #define ioremap_prot ioremap_prot
 
-#define _PAGE_IOREMAP PROT_DEVICE_nGnRE
+#define _PAGE_IOREMAP (PROT_DEVICE_nGnRE | PROT_NS_SHARED)
 
 #define ioremap_wc(addr, size)	\
-	ioremap_prot((addr), (size), PROT_NORMAL_NC)
+	ioremap_prot((addr), (size), (PROT_NORMAL_NC | PROT_NS_SHARED))
 #define ioremap_np(addr, size)	\
-	ioremap_prot((addr), (size), PROT_DEVICE_nGnRnE)
+	ioremap_prot((addr), (size), (PROT_DEVICE_nGnRnE | PROT_NS_SHARED))
 
 /*
  * io{read,write}{16,32,64}be() macros
-- 
2.34.1