[PATCH v5 4/9] libxc: introduce domain builder architecture specific data

[Juergen Gross <jgross@suse.com>]

Reorganize struct xc_dom_image to contain a pointer to domain builder
architecture specific private data. This will abstract the architecture
or domain type specific data from the general used data.

The new area is allocated as soon as the domain type is known.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
 stubdom/grub/kexec.c         |  6 +++++-
 tools/libxc/include/xc_dom.h |  6 +++++-
 tools/libxc/xc_dom_core.c    | 27 +++++++++++++++++++--------
 3 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/stubdom/grub/kexec.c b/stubdom/grub/kexec.c
index 2300318..8fd9ff9 100644
--- a/stubdom/grub/kexec.c
+++ b/stubdom/grub/kexec.c
@@ -272,7 +272,11 @@ void kexec(void *kernel, long kernel_size, void *module, long module_size, char
 #endif
 
     /* equivalent of xc_dom_mem_init */
-    dom->arch_hooks = xc_dom_find_arch_hooks(xc_handle, dom->guest_type);
+    if (xc_dom_set_arch_hooks(dom)) {
+        grub_printf("xc_dom_set_arch_hooks failed\n");
+        errnum = ERR_EXEC_FORMAT;
+        goto out;
+    }
     dom->total_pages = start_info.nr_pages;
 
     /* equivalent of arch_setup_meminit */
diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index 19d45f4..09f73cd 100644
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -175,6 +175,9 @@ struct xc_dom_image {
     unsigned int *vnode_to_pnode;
     unsigned int nr_vnodes;
 
+    /* domain type/architecture specific data */
+    void *arch_private;
+
     /* kernel loader */
     struct xc_dom_arch *arch_hooks;
     /* allocate up to pfn_alloc_end */
@@ -237,6 +240,7 @@ struct xc_dom_arch {
     char *native_protocol;
     int page_shift;
     int sizeof_pfn;
+    int arch_private_size;
 
     struct xc_dom_arch *next;
 };
@@ -290,7 +294,7 @@ int xc_dom_devicetree_mem(struct xc_dom_image *dom, const void *mem,
                           size_t memsize);
 
 int xc_dom_parse_image(struct xc_dom_image *dom);
-struct xc_dom_arch *xc_dom_find_arch_hooks(xc_interface *xch, char *guest_type);
+int xc_dom_set_arch_hooks(struct xc_dom_image *dom);
 int xc_dom_build_image(struct xc_dom_image *dom);
 int xc_dom_update_guest_p2m(struct xc_dom_image *dom);
 
diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
index 74de3c3..3a31222 100644
--- a/tools/libxc/xc_dom_core.c
+++ b/tools/libxc/xc_dom_core.c
@@ -710,19 +710,30 @@ void xc_dom_register_arch_hooks(struct xc_dom_arch *hooks)
     first_hook = hooks;
 }
 
-struct xc_dom_arch *xc_dom_find_arch_hooks(xc_interface *xch, char *guest_type)
+int xc_dom_set_arch_hooks(struct xc_dom_image *dom)
 {
     struct xc_dom_arch *hooks = first_hook;
 
     while (  hooks != NULL )
     {
-        if ( !strcmp(hooks->guest_type, guest_type))
-            return hooks;
+        if ( !strcmp(hooks->guest_type, dom->guest_type) )
+        {
+            if ( hooks->arch_private_size )
+            {
+                dom->arch_private = malloc(hooks->arch_private_size);
+                if ( dom->arch_private == NULL )
+                    return -1;
+                memset(dom->arch_private, 0, hooks->arch_private_size);
+                dom->alloc_malloc += hooks->arch_private_size;
+            }
+            dom->arch_hooks = hooks;
+            return 0;
+        }
         hooks = hooks->next;
     }
-    xc_dom_panic(xch, XC_INVALID_KERNEL,
-                 "%s: not found (type %s)", __FUNCTION__, guest_type);
-    return NULL;
+    xc_dom_panic(dom->xch, XC_INVALID_KERNEL,
+                 "%s: not found (type %s)", __FUNCTION__, dom->guest_type);
+    return -1;
 }
 
 /* ------------------------------------------------------------------------ */
@@ -734,6 +745,7 @@ void xc_dom_release(struct xc_dom_image *dom)
     if ( dom->phys_pages )
         xc_dom_unmap_all(dom);
     xc_dom_free_all(dom);
+    free(dom->arch_private);
     free(dom);
 }
 
@@ -924,8 +936,7 @@ int xc_dom_mem_init(struct xc_dom_image *dom, unsigned int mem_mb)
     unsigned int page_shift;
     xen_pfn_t nr_pages;
 
-    dom->arch_hooks = xc_dom_find_arch_hooks(dom->xch, dom->guest_type);
-    if ( dom->arch_hooks == NULL )
+    if ( xc_dom_set_arch_hooks(dom) )
     {
         xc_dom_panic(dom->xch, XC_INTERNAL_ERROR, "%s: arch hooks not set",
                      __FUNCTION__);
-- 
2.6.2