linux-kernel - [PATCH v2 05/14] fixmap: Allow architecture overriding set_fixmap

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Date: Fri, 12 Apr 2024 09:42:04 +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 v2 05/14] fixmap: Allow architecture overriding set_fixmap_io

From: Suzuki K Poulose <suzuki.poulose@....com>

For a realm guest it will be necessary to ensure IO mappings are shared
so that the VMM can emulate the device. The following patch will provide
an implementation of set_fixmap_io for arm64 setting the shared bit (if
in a realm).

Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Steven Price <steven.price@....com>
---
 include/asm-generic/fixmap.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 8cc7b09c1bc7..c5ce0368c1ee 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -94,8 +94,10 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
 /*
  * Some fixmaps are for IO
  */
+#ifndef set_fixmap_io
 #define set_fixmap_io(idx, phys) \
 	__set_fixmap(idx, phys, FIXMAP_PAGE_IO)
+#endif
 
 #define set_fixmap_offset_io(idx, phys) \
 	__set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO)
-- 
2.34.1