x86: add and use XEN_DOMCTL_getpageframeinfo3

To support wider than 28-bit MFNs, add XEN_DOMCTL_getpageframeinfo3
(with the type replacing the passed in MFN rather than getting or-ed
into it) to properly back xc_get_pfn_type_batch().

With xc_get_pfn_type_batch() only used internally to libxc, move its
prototype from xenctrl.h to xc_private.h.

This also fixes a couple of bugs in pre-existing code:
- the failure path for init_mem_info() leaked minfo->pfn_type,
- one error path of the XEN_DOMCTL_getpageframeinfo2 handler used
  put_domain() where rcu_unlock_domain() was meant, and
- the XEN_DOMCTL_getpageframeinfo2 handler could call
  xsm_getpageframeinfo() with an invalid struct page_info pointer.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/libxc/xc_private.h b/tools/libxc/xc_private.h
index 4676fe8ea2..dc88add9c8 100644
--- a/tools/libxc/xc_private.h
+++ b/tools/libxc/xc_private.h
@@ -191,6 +191,9 @@ void *xc_map_foreign_ranges(int xc_handle, uint32_t dom,
                             size_t size, int prot, size_t chunksize,
                             privcmd_mmap_entry_t entries[], int nentries);
 
+int xc_get_pfn_type_batch(int xc_handle, uint32_t dom,
+                          unsigned int num, xen_pfn_t *);
+
 void bitmap_64_to_byte(uint8_t *bp, const uint64_t *lp, int nbits);
 void bitmap_byte_to_64(uint64_t *lp, const uint8_t *bp, int nbits);