linux-kernel - [RFC PATCH 05/14] arm64: Mark all I/O as non-secure shared

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Date:   Fri, 27 Jan 2023 11:27:49 +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 05/14] 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 877495a0fd0c..b1a9c22aed72 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -142,12 +142,12 @@ extern void __memset_io(volatile void __iomem *, int, size_t);
 bool ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot);
 #define ioremap_allowed ioremap_allowed
 
-#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