[Xen-changelog] [xen master] xen/page_alloc: statically allocate bootmem_region_list

[patchbot@xxxxxxx]

commit c61c1b49430527ee16fbf5b55aca195c325b1a23
Author:     Hongyan Xia <hongyxia@xxxxxxxxxx>
AuthorDate: Tue Dec 17 14:33:19 2019 +0000
Commit:     Julien Grall <julien@xxxxxxx>
CommitDate: Tue Dec 17 16:51:20 2019 +0000

    xen/page_alloc: statically allocate bootmem_region_list
    
    The existing code assumes that the first mfn passed to the boot
    allocator is mapped, which creates problems when, e.g., we do not have
    a direct map, and may create other bootstrapping problems in the
    future. Make it static. The size is kept the same as before (1 page).
    
    Signed-off-by: Hongyan Xia <hongyxia@xxxxxxxxxx>
    Reviewed-by: Julien Grall <julien@xxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/page_alloc.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 7cb1bd368b..919a270587 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -244,9 +244,12 @@ PAGE_LIST_HEAD(page_broken_list);
  */
 mfn_t first_valid_mfn = INVALID_MFN_INITIALIZER;
 
-static struct bootmem_region {
+struct bootmem_region {
     unsigned long s, e; /* MFNs @s through @e-1 inclusive are free */
-} *__initdata bootmem_region_list;
+};
+/* Statically allocate a page for bootmem_region_list. */
+static struct bootmem_region __initdata
+    bootmem_region_list[PAGE_SIZE / sizeof(struct bootmem_region)];
 static unsigned int __initdata nr_bootmem_regions;
 
 struct scrub_region {
@@ -263,9 +266,6 @@ static void __init bootmem_region_add(unsigned long s, 
unsigned long e)
 {
     unsigned int i;
 
-    if ( (bootmem_region_list == NULL) && (s < e) )
-        bootmem_region_list = mfn_to_virt(s++);
-
     if ( s >= e )
         return;
 
@@ -1869,7 +1869,6 @@ void __init end_boot_allocator(void)
             init_heap_pages(mfn_to_page(_mfn(r->s)), r->e - r->s);
     }
     nr_bootmem_regions = 0;
-    init_heap_pages(virt_to_page(bootmem_region_list), 1);
 
     if ( !dma_bitsize && (num_online_nodes() > 1) )
         dma_bitsize = arch_get_dma_bitsize();
--
generated by git-patchbot for /home/xen/git/xen.git#master

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