tools/libxc: introduce xc_memalign in xc_{minios,linux,solaris,netbsd}.c

Move (page aligned) buffer allocations in {os}_privcmd_alloc_hypercall_buffer
into a global function xc_memalign. This API is also used by Remus
compression code to allocate compression caches that need to be page aligned.

Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Brendan Cully <brendan@cs.ubc.ca>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/tools/libxc/xc_minios.c b/tools/libxc/xc_minios.c
index ff9c0d8d19..8bbfd186d5 100644
--- a/tools/libxc/xc_minios.c
+++ b/tools/libxc/xc_minios.c
@@ -73,7 +73,7 @@ void minios_interface_close_fd(int fd)
 
 static void *minios_privcmd_alloc_hypercall_buffer(xc_interface *xch, xc_osdep_handle h, int npages)
 {
-    return memalign(PAGE_SIZE, npages * PAGE_SIZE);
+    return xc_memalign(xch, PAGE_SIZE, npages * PAGE_SIZE);
 }
 
 static void minios_privcmd_free_hypercall_buffer(xc_interface *xch, xc_osdep_handle h, void *ptr, int npages)
@@ -437,6 +437,11 @@ void discard_file_cache(xc_interface *xch, int fd, int flush)
         fsync(fd);
 }
 
+void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
+{
+    return memalign(alignment, size);
+}
+
 static xc_osdep_handle minios_gnttab_open(xc_gnttab *xcg)
 {
     int fd = alloc_fd(FTYPE_GNTMAP);