[xen staging] xen/arm: mem_access: Conditionally compile mem_access.c

[patchbot@xxxxxxx]

commit 9e58da32cc844b3fb7612fc35ece3a96f8cbf744
Author:     Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>
AuthorDate: Fri May 10 14:32:11 2024 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Thu May 23 13:36:41 2024 +0100

    xen/arm: mem_access: Conditionally compile mem_access.c
    
    Commit 634cfc8beb ("Make MEM_ACCESS configurable") intended to make
    MEM_ACCESS configurable on Arm to reduce the code size when the user
    doesn't need it.
    
    However, this didn't cover the arch specific code. None of the code
    in arm/mem_access.c is necessary when MEM_ACCESS=n, so it can be
    compiled out. This will require to provide some stub for functions
    called by the common code.
    
    Signed-off-by: Alessandro Zucchelli <alessandro.zucchelli@xxxxxxxxxxx>
    Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
    Release-acked-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/arm/Makefile                 |  2 +-
 xen/arch/arm/include/asm/mem_access.h | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 7b1350e2ef..45dc29ea53 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -37,7 +37,7 @@ obj-$(CONFIG_IOREQ_SERVER) += ioreq.o
 obj-y += irq.o
 obj-y += kernel.init.o
 obj-$(CONFIG_LIVEPATCH) += livepatch.o
-obj-y += mem_access.o
+obj-$(CONFIG_MEM_ACCESS) += mem_access.o
 obj-y += mm.o
 obj-y += monitor.o
 obj-y += p2m.o
diff --git a/xen/arch/arm/include/asm/mem_access.h 
b/xen/arch/arm/include/asm/mem_access.h
index 35ed0ad154..abac8032fc 100644
--- a/xen/arch/arm/include/asm/mem_access.h
+++ b/xen/arch/arm/include/asm/mem_access.h
@@ -17,6 +17,8 @@
 #ifndef _ASM_ARM_MEM_ACCESS_H
 #define _ASM_ARM_MEM_ACCESS_H
 
+#include <xen/types.h>
+
 static inline
 bool p2m_mem_access_emulate_check(struct vcpu *v,
                                   const struct vm_event_st *rsp)
@@ -35,12 +37,28 @@ static inline bool p2m_mem_access_sanity_check(struct 
domain *d)
  * Send mem event based on the access. Boolean return value indicates if trap
  * needs to be injected into guest.
  */
+#ifdef CONFIG_MEM_ACCESS
 bool p2m_mem_access_check(paddr_t gpa, vaddr_t gla, const struct npfec npfec);
 
 struct page_info*
 p2m_mem_access_check_and_get_page(vaddr_t gva, unsigned long flag,
                                   const struct vcpu *v);
+#else
+
+static inline bool
+p2m_mem_access_check(paddr_t gpa, vaddr_t gla, const struct npfec npfec)
+{
+    return false;
+}
+
+static inline struct page_info*
+p2m_mem_access_check_and_get_page(vaddr_t gva, unsigned long flag,
+                                  const struct vcpu *v)
+{
+    return NULL;
+}
 
+#endif /*CONFIG_MEM_ACCESS*/
 #endif /* _ASM_ARM_MEM_ACCESS_H */
 
 /*
--
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