[PATCH 4/5] libxc: split p2m allocation in domain builder from other magic pages

[Juergen Gross <jgross@suse.com>]

Add an own function to allocate the p2m list in the domain builder in
order to prepare allocating the p2m list outside of the initial kernel
mapping. This will be needed to support loading domains with huge
memory (>512 GB).

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 tools/libxc/include/xc_dom.h |  1 +
 tools/libxc/xc_dom_core.c    |  3 +++
 tools/libxc/xc_dom_x86.c     | 11 ++++++++++-
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index a4ca8a4..43b1eab 100644
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -199,6 +199,7 @@ void xc_dom_register_loader(struct xc_dom_loader *loader);
 struct xc_dom_arch {
     /* pagetable setup */
     int (*alloc_magic_pages) (struct xc_dom_image * dom);
+    int (*alloc_p2m_list) (struct xc_dom_image * dom);
     int (*count_pgtables) (struct xc_dom_image * dom);
     int (*setup_pgtables) (struct xc_dom_image * dom);
 
diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
index bb668b1..81b642e 100644
--- a/tools/libxc/xc_dom_core.c
+++ b/tools/libxc/xc_dom_core.c
@@ -1048,6 +1048,9 @@ int xc_dom_build_image(struct xc_dom_image *dom)
     }
 
     /* allocate other pages */
+    if ( dom->arch_hooks->alloc_p2m_list &&
+         dom->arch_hooks->alloc_p2m_list(dom) != 0 )
+        goto err;
     if ( dom->arch_hooks->alloc_magic_pages(dom) != 0 )
         goto err;
     if ( dom->arch_hooks->count_pgtables )
diff --git a/tools/libxc/xc_dom_x86.c b/tools/libxc/xc_dom_x86.c
index 3d40fa4..91d4e49 100644
--- a/tools/libxc/xc_dom_x86.c
+++ b/tools/libxc/xc_dom_x86.c
@@ -438,7 +438,7 @@ pfn_error:
 
 /* ------------------------------------------------------------------------ */
 
-static int alloc_magic_pages(struct xc_dom_image *dom)
+static int alloc_p2m_list(struct xc_dom_image *dom)
 {
     size_t p2m_alloc_size = dom->p2m_size * dom->arch_hooks->sizeof_pfn;
 
@@ -450,6 +450,13 @@ static int alloc_magic_pages(struct xc_dom_image *dom)
     if ( dom->p2m_guest == NULL )
         return -1;
 
+    return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int alloc_magic_pages(struct xc_dom_image *dom)
+{
     /* allocate special pages */
     dom->start_info_pfn = xc_dom_alloc_page(dom, "start info");
     dom->xenstore_pfn = xc_dom_alloc_page(dom, "xenstore");
@@ -676,6 +683,7 @@ static struct xc_dom_arch xc_dom_32_pae = {
     .page_shift = PAGE_SHIFT_X86,
     .sizeof_pfn = 4,
     .alloc_magic_pages = alloc_magic_pages,
+    .alloc_p2m_list = alloc_p2m_list,
     .count_pgtables = count_pgtables_x86_32_pae,
     .setup_pgtables = setup_pgtables_x86_32_pae,
     .start_info = start_info_x86_32,
@@ -689,6 +697,7 @@ static struct xc_dom_arch xc_dom_64 = {
     .page_shift = PAGE_SHIFT_X86,
     .sizeof_pfn = 8,
     .alloc_magic_pages = alloc_magic_pages,
+    .alloc_p2m_list = alloc_p2m_list,
     .count_pgtables = count_pgtables_x86_64,
     .setup_pgtables = setup_pgtables_x86_64,
     .start_info = start_info_x86_64,
-- 
2.1.4