[PATCH RFC 1/2] xen: remove CONFIG_PAGING_ASSISTANCE

[Wei Liu <wei.liu2@citrix.com>]

Arm should always set it, while on x86 xen can't build with it set to
0, which means people haven't used it for years.

Remove it and simplify xen/paging.h.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Julien Grall <julien.grall@arm.com>
---
 xen/include/asm-arm/config.h |  2 --
 xen/include/asm-x86/config.h |  1 -
 xen/include/xen/paging.h     | 19 -------------------
 3 files changed, 22 deletions(-)

diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index 7da94698e1..210c9f858b 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -24,8 +24,6 @@
 /* xen_ulong_t is always 64 bits */
 #define BITS_PER_XEN_ULONG 64
 
-#define CONFIG_PAGING_ASSISTANCE 1
-
 #define CONFIG_PAGING_LEVELS 3
 
 #define CONFIG_ARM 1
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index 0130ac864f..f63a9cb952 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -19,7 +19,6 @@
 
 #define BITS_PER_XEN_ULONG BITS_PER_LONG
 
-#define CONFIG_PAGING_ASSISTANCE 1
 #define CONFIG_X86_PM_TIMER 1
 #define CONFIG_HPET_TIMER 1
 #define CONFIG_X86_MCE_THERMAL 1
diff --git a/xen/include/xen/paging.h b/xen/include/xen/paging.h
index 214bde5576..a126c9bf58 100644
--- a/xen/include/xen/paging.h
+++ b/xen/include/xen/paging.h
@@ -1,26 +1,7 @@
-
 #ifndef __XEN_PAGING_H__
 #define __XEN_PAGING_H__
 
-#if defined CONFIG_PAGING_ASSISTANCE
-
 #include <asm/paging.h>
 #include <asm/p2m.h>
 
-#elif defined CONFIG_SHADOW_PAGING
-
-#include <asm/shadow.h>
-
-#define paging_mode_translate(d)  shadow_mode_translate(d)
-#define paging_mode_external(d)   (0)
-
-#else
-
-#define paging_mode_translate(d)              (0)
-#define paging_mode_external(d)               (0)
-#define guest_physmap_add_page(d, p, m, o)    ((void)0)
-#define guest_physmap_remove_page(d, p, m, o) ((void)0)
-
-#endif
-
 #endif /* __XEN_PAGING_H__ */
-- 
2.11.0


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