diff mbox series

[v5,08/19] fixmap: Allow architecture overriding set_fixmap_io

Message ID 20240819131924.372366-9-steven.price@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Support for running as a guest in Arm CCA | expand

Commit Message

Steven Price Aug. 19, 2024, 1:19 p.m. UTC 
From: Suzuki K Poulose <suzuki.poulose@arm.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@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
New patch for v5
---
 include/asm-generic/fixmap.h | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 29cab7947980..9b75fe2bd8fd 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
 
 #endif /* __ASSEMBLY__ */
 #endif /* __ASM_GENERIC_FIXMAP_H */