[Xen-devel] [PATCH] gnttab/ARM: properly implement gnttab_create_status_page()

["Jan Beulich" <JBeulich@xxxxxxxx>]

Prevent the "BUG_ON(page_get_owner(pg) != d)" in
gnttab_unpopulate_status_frames() from triggering.

Reported-by: 王磊 <lei19.wang@xxxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
It looks to me as if this was the only piece missing to make v2 grant
tables work on ARM, but this was build tested only anyway.

--- a/xen/include/asm-arm/grant_table.h
+++ b/xen/include/asm-arm/grant_table.h
@@ -21,7 +21,6 @@ int create_grant_host_mapping(unsigned l
 int replace_grant_host_mapping(unsigned long gpaddr, mfn_t mfn,
                                unsigned long new_gpaddr, unsigned int flags);
 void gnttab_mark_dirty(struct domain *d, mfn_t mfn);
-#define gnttab_create_status_page(d, t, i) do {} while (0)
 #define gnttab_release_host_mappings(domain) 1
 static inline int replace_grant_supported(void)
 {
@@ -84,6 +83,12 @@ static inline unsigned int gnttab_dom0_m
             virt_to_page((char *)(t)->shared_raw[i]), d, SHARE_rw);      \
     } while ( 0 )
 
+#define gnttab_create_status_page(d, t, i)                               \
+    do {                                                                 \
+        share_xen_page_with_guest(                                       \
+            virt_to_page((char *)(t)->status[i]), d, SHARE_rw);          \
+    } while ( 0 )
+
 #define gnttab_shared_gmfn(d, t, i)                                      \
     gfn_x(((i) >= nr_grant_frames(t)) ? INVALID_GFN : (t)->arch.shared_gfn[i])
 


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