Add support for superpages (hugepages) in PV domain

This patch adds the option "superpages" to the domain configuration
file. If it is set, the domain is populated using 2M pages.

This code does not support fallback to small pages.  If the domain can
not be created with 2M pages, the  create will fail.

The patch also includes support for saving and restoring domains with
the superpage flag set.  However, if a domain has freed small pages
within its physical page array and then extended the array, the
restore will fill in those freed pages.  It will then attempt to
allocate more than its memory limit and will fail.  This is
significant because apparently Linux does this during boot, thus a
freshly booted Linux image can not be saved and restored successfully.

Signed-off-by: Dave McCracken <dcm@mccr.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/libxc/xc_dom.h b/tools/libxc/xc_dom.h
index ca03ba5db4..3d6d9164bd 100644
--- a/tools/libxc/xc_dom.h
+++ b/tools/libxc/xc_dom.h
@@ -174,7 +174,7 @@ int xc_dom_build_image(struct xc_dom_image *dom);
 int xc_dom_update_guest_p2m(struct xc_dom_image *dom);
 
 int xc_dom_boot_xen_init(struct xc_dom_image *dom, int xc, domid_t domid);
-int xc_dom_boot_mem_init(struct xc_dom_image *dom);
+int xc_dom_boot_mem_init(struct xc_dom_image *dom, int superpages);
 void *xc_dom_boot_domU_map(struct xc_dom_image *dom, xen_pfn_t pfn,
                            xen_pfn_t count);
 int xc_dom_boot_image(struct xc_dom_image *dom);
@@ -260,7 +260,7 @@ static inline xen_pfn_t xc_dom_p2m_guest(struct xc_dom_image *dom,
 
 /* --- arch bits --------------------------------------------------- */
 
-int arch_setup_meminit(struct xc_dom_image *dom);
+int arch_setup_meminit(struct xc_dom_image *dom, int superpages);
 int arch_setup_bootearly(struct xc_dom_image *dom);
 int arch_setup_bootlate(struct xc_dom_image *dom);