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, 12 insertions, 0 deletions

diff --git a/tools/libxc/xc_linux.c b/tools/libxc/xc_linux.c
index 9acf27573e..5504df6cba 100644
--- a/tools/libxc/xc_linux.c
+++ b/tools/libxc/xc_linux.c
@@ -55,6 +55,18 @@ void discard_file_cache(xc_interface *xch, int fd, int flush)
     errno = saved_errno;
 }
 
+void *xc_memalign(xc_interface *xch, size_t alignment, size_t size)
+{
+    int ret;
+    void *ptr;
+
+    ret = posix_memalign(&ptr, alignment, size);
+    if (ret != 0 || !ptr)
+        return NULL;
+
+    return ptr;
+}
+
 /*
  * Local variables:
  * mode: C