[Xen-changelog] [xen master] memguard: drop memguard_init() entirely

[patchbot@xxxxxxx]

commit a3d7fa00d16831b60ec83e51a8f55e7e6b55781f
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Feb 25 13:05:33 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 25 13:05:33 2016 +0100

    memguard: drop memguard_init() entirely
    
    The use of MAP_SMALL_PAGES causes shattering of the superpages making up the
    Xen virtual region, and is counter to the purpose of this series.
    Furthermore, it is not required for the memguard infrastructure to function
    (which itself uses map_pages_to_xen() for creating holes).
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <JBeulich@xxxxxxxx>
    Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
---
 xen/arch/x86/mm.c        | 16 ----------------
 xen/arch/x86/setup.c     |  2 --
 xen/include/asm-arm/mm.h |  1 -
 xen/include/asm-x86/mm.h |  2 --
 4 files changed, 21 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index d6aaed8..ed8ab02 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -6346,22 +6346,6 @@ void free_perdomain_mappings(struct domain *d)
 
 #ifdef MEMORY_GUARD
 
-void memguard_init(void)
-{
-    unsigned long start = max_t(unsigned long, xen_phys_start, 1UL << 20);
-    map_pages_to_xen(
-        (unsigned long)__va(start),
-        start >> PAGE_SHIFT,
-        (__pa(&_end) + PAGE_SIZE - 1 - start) >> PAGE_SHIFT,
-        __PAGE_HYPERVISOR_RW|MAP_SMALL_PAGES);
-    BUG_ON(start != xen_phys_start);
-    map_pages_to_xen(
-        XEN_VIRT_START,
-        start >> PAGE_SHIFT,
-        (__pa(&_end) + PAGE_SIZE - 1 - start) >> PAGE_SHIFT,
-        __PAGE_HYPERVISOR|MAP_SMALL_PAGES);
-}
-
 static void __memguard_change_range(void *p, unsigned long l, int guard)
 {
     unsigned long _p = (unsigned long)p;
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index b8a28d7..cddf954 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1146,8 +1146,6 @@ void __init noreturn __start_xen(unsigned long mbi_p)
                    ~((1UL << L2_PAGETABLE_SHIFT) - 1);
     destroy_xen_mappings(xen_virt_end, XEN_VIRT_START + BOOTSTRAP_MAP_BASE);
 
-    memguard_init();
-
     nr_pages = 0;
     for ( i = 0; i < e820.nr_map; i++ )
         if ( e820.map[i].type == E820_RAM )
diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index 2e9d0b2..68cf203 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -331,7 +331,6 @@ unsigned long domain_get_maximum_gpfn(struct domain *d);
 
 extern struct domain *dom_xen, *dom_io, *dom_cow;
 
-#define memguard_init(_s)              (_s)
 #define memguard_guard_stack(_p)       ((void)0)
 #define memguard_guard_range(_p,_l)    ((void)0)
 #define memguard_unguard_range(_p,_l)  ((void)0)
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index a097382..23a4092 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -479,11 +479,9 @@ extern struct rangeset *mmio_ro_ranges;
 #define compat_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 
20))
 
 #ifdef MEMORY_GUARD
-void memguard_init(void);
 void memguard_guard_range(void *p, unsigned long l);
 void memguard_unguard_range(void *p, unsigned long l);
 #else
-#define memguard_init()                ((void)0)
 #define memguard_guard_range(_p,_l)    ((void)0)
 #define memguard_unguard_range(_p,_l)  ((void)0)
 #endif
--
generated by git-patchbot for /home/xen/git/xen.git#master

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