libxc: add p2m_size to xc_dom_image

Add a new field p2m_size to keep track of the number of pages covered by
p2m.  Change total_pages to p2m_size in functions which in fact need
the size of p2m.

This is needed because we are going to ditch the assumption that PV x86
has only one contiguous ram region. Originally the p2m size was always
equal to total_pages, but we will soon change that in later patch.

This patch doesn't change the behaviour of libxc.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Dario Faggioli <dario.faggioli@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index 07d7224b76c6a2bdcfbf84b5b5253ec35cf6060f..6b8ddf41a11d3e530ebf0a5689e8e0c31e4d6dbd 100644 (file)
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -129,6 +129,7 @@ struct xc_dom_image {
      */
     xen_pfn_t rambase_pfn;
     xen_pfn_t total_pages;
+    xen_pfn_t p2m_size;         /* number of pfns covered by p2m */
     struct xc_dom_phys *phys_pages;
     int realmodearea_log;
 #if defined (__arm__) || defined(__aarch64__)

diff --git a/tools/libxc/xc_dom_arm.c b/tools/libxc/xc_dom_arm.c
index c7feca73e14d666b2904941ea2917dd9b8490fbe..b9fa66daa0bc7c2915bc3d081e231b0546745e57 100644 (file)
--- a/tools/libxc/xc_dom_arm.c
+++ b/tools/libxc/xc_dom_arm.c
@@ -449,6 +449,7 @@ int arch_setup_meminit(struct xc_dom_image *dom)
     assert(dom->rambank_size[0] != 0);
     assert(ramsize == 0); /* Too much RAM is rejected above */
 
+    dom->p2m_size = p2m_size;
     dom->p2m_host = xc_dom_malloc(dom, sizeof(xen_pfn_t) * p2m_size);
     if ( dom->p2m_host == NULL )
         return -EINVAL;

diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
index ecbf981988c9f644bd17a4cd44e7512eb2758a9d..b100ce197000a339b64dce8aadc5c9182653f44d 100644 (file)
--- a/tools/libxc/xc_dom_core.c
+++ b/tools/libxc/xc_dom_core.c
@@ -931,9 +931,9 @@ int xc_dom_update_guest_p2m(struct xc_dom_image *dom)
     {
     case 4:
         DOMPRINTF("%s: dst 32bit, pages 0x%" PRIpfn "",
-                  __FUNCTION__, dom->total_pages);
+                  __FUNCTION__, dom->p2m_size);
         p2m_32 = dom->p2m_guest;
-        for ( i = 0; i < dom->total_pages; i++ )
+        for ( i = 0; i < dom->p2m_size; i++ )
             if ( dom->p2m_host[i] != INVALID_P2M_ENTRY )
                 p2m_32[i] = dom->p2m_host[i];
             else
@@ -941,9 +941,9 @@ int xc_dom_update_guest_p2m(struct xc_dom_image *dom)
         break;
     case 8:
         DOMPRINTF("%s: dst 64bit, pages 0x%" PRIpfn "",
-                  __FUNCTION__, dom->total_pages);
+                  __FUNCTION__, dom->p2m_size);
         p2m_64 = dom->p2m_guest;
-        for ( i = 0; i < dom->total_pages; i++ )
+        for ( i = 0; i < dom->p2m_size; i++ )
             if ( dom->p2m_host[i] != INVALID_P2M_ENTRY )
                 p2m_64[i] = dom->p2m_host[i];
             else

diff --git a/tools/libxc/xc_dom_x86.c b/tools/libxc/xc_dom_x86.c
index 9dbaedb51abf64b060e441a96862267c84bc967f..bea54f2bd2dfc33d68f35c71a933af0822c9cfd7 100644 (file)
--- a/tools/libxc/xc_dom_x86.c
+++ b/tools/libxc/xc_dom_x86.c
@@ -122,11 +122,11 @@ static int count_pgtables(struct xc_dom_image *dom, int pae,
 
         try_pfn_end = (try_virt_end - dom->parms.virt_base) >> PAGE_SHIFT_X86;
 
-        if ( try_pfn_end > dom->total_pages )
+        if ( try_pfn_end > dom->p2m_size )
         {
             xc_dom_panic(dom->xch, XC_OUT_OF_MEMORY,
                          "%s: not enough memory for initial mapping (%#"PRIpfn" > %#"PRIpfn")",
-                         __FUNCTION__, try_pfn_end, dom->total_pages);
+                         __FUNCTION__, try_pfn_end, dom->p2m_size);
             return -ENOMEM;
         }
 
@@ -440,10 +440,11 @@ pfn_error:
 
 static int alloc_magic_pages(struct xc_dom_image *dom)
 {
-    size_t p2m_size = dom->total_pages * dom->arch_hooks->sizeof_pfn;
+    size_t p2m_alloc_size = dom->p2m_size * dom->arch_hooks->sizeof_pfn;
 
     /* allocate phys2mach table */
-    if ( xc_dom_alloc_segment(dom, &dom->p2m_seg, "phys2mach", 0, p2m_size) )
+    if ( xc_dom_alloc_segment(dom, &dom->p2m_seg, "phys2mach",
+                              0, p2m_alloc_size) )
         return -1;
     dom->p2m_guest = xc_dom_seg_to_ptr(dom, &dom->p2m_seg);
     if ( dom->p2m_guest == NULL )
@@ -777,8 +778,9 @@ int arch_setup_meminit(struct xc_dom_image *dom)
         int count = dom->total_pages >> SUPERPAGE_PFN_SHIFT;
         xen_pfn_t extents[count];
 
+        dom->p2m_size = dom->total_pages;
         dom->p2m_host = xc_dom_malloc(dom, sizeof(xen_pfn_t) *
-                                      dom->total_pages);
+                                      dom->p2m_size);
         if ( dom->p2m_host == NULL )
             return -EINVAL;
 
@@ -810,8 +812,9 @@ int arch_setup_meminit(struct xc_dom_image *dom)
                 return rc;
         }
         /* setup initial p2m */
+        dom->p2m_size = dom->total_pages;
         dom->p2m_host = xc_dom_malloc(dom, sizeof(xen_pfn_t) *
-                                      dom->total_pages);
+                                      dom->p2m_size);
         if ( dom->p2m_host == NULL )
             return -EINVAL;
         for ( pfn = 0; pfn < dom->total_pages; pfn++ )
@@ -860,7 +863,7 @@ static int map_grant_table_frames(struct xc_dom_image *dom)
     {
         rc = xc_domain_add_to_physmap(dom->xch, dom->guest_domid,
                                       XENMAPSPACE_grant_table,
-                                      i, dom->total_pages + i);
+                                      i, dom->p2m_size + i);
         if ( rc != 0 )
         {
             if ( (i > 0) && (errno == EINVAL) )
@@ -870,7 +873,7 @@ static int map_grant_table_frames(struct xc_dom_image *dom)
             }
             xc_dom_panic(dom->xch, XC_INTERNAL_ERROR,
                          "%s: mapping grant tables failed " "(pfn=0x%" PRIpfn
-                         ", rc=%d)", __FUNCTION__, dom->total_pages + i, rc);
+                         ", rc=%d)", __FUNCTION__, dom->p2m_size + i, rc);
             return rc;
         }
     }