[Xen-changelog] The perdomain mapping area in Xen space requires more than

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID c640c0c7f821a202fecda775811184d1cf851cbe
# Parent  9da47130ff421727defa26bd91c22bec1125a87f
The perdomain mapping area in Xen space requires more than
one level-1 pagetable page on PAE and x86/64. Generalise
the existing code to allocate and map an appropriate number
of level-1 pagetable pages.

Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 9da47130ff42 -r c640c0c7f821 xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c     Thu Nov 17 11:12:57 2005
+++ b/xen/arch/x86/domain.c     Thu Nov 17 11:52:42 2005
@@ -240,7 +240,10 @@
 
 void free_perdomain_pt(struct domain *d)
 {
-    free_xenheap_page(d->arch.mm_perdomain_pt);
+    free_xenheap_pages(
+        d->arch.mm_perdomain_pt,
+        get_order_from_bytes(PDPT_L1_ENTRIES * sizeof(l1_pgentry_t)));
+
 #ifdef __x86_64__
     free_xenheap_page(d->arch.mm_perdomain_l2);
     free_xenheap_page(d->arch.mm_perdomain_l3);
@@ -251,7 +254,7 @@
 {
     struct domain *d = v->domain;
     l1_pgentry_t gdt_l1e;
-    int vcpuid;
+    int vcpuid, pdpt_order;
 
     if ( is_idle_task(d) )
         return;
@@ -263,13 +266,10 @@
     v->vcpu_info = &d->shared_info->vcpu_data[v->vcpu_id];
     v->cpumap = CPUMAP_RUNANYWHERE;
     SHARE_PFN_WITH_DOMAIN(virt_to_page(d->shared_info), d);
-    set_pfn_from_mfn(virt_to_phys(d->shared_info) >> PAGE_SHIFT,
-            INVALID_M2P_ENTRY);
-
-    d->arch.mm_perdomain_pt = alloc_xenheap_page();
-    memset(d->arch.mm_perdomain_pt, 0, PAGE_SIZE);
-    set_pfn_from_mfn(virt_to_phys(d->arch.mm_perdomain_pt) >> PAGE_SHIFT,
-            INVALID_M2P_ENTRY);
+
+    pdpt_order = get_order_from_bytes(PDPT_L1_ENTRIES * sizeof(l1_pgentry_t));
+    d->arch.mm_perdomain_pt = alloc_xenheap_pages(pdpt_order);
+    memset(d->arch.mm_perdomain_pt, 0, PAGE_SIZE << pdpt_order);
     v->arch.perdomain_ptes = d->arch.mm_perdomain_pt;
 
     /*
@@ -293,9 +293,11 @@
 
     d->arch.mm_perdomain_l2 = alloc_xenheap_page();
     memset(d->arch.mm_perdomain_l2, 0, PAGE_SIZE);
-    d->arch.mm_perdomain_l2[l2_table_offset(PERDOMAIN_VIRT_START)] =
-        l2e_from_page(virt_to_page(d->arch.mm_perdomain_pt),
-                        __PAGE_HYPERVISOR);
+    for ( i = 0; i < (1 << pdpt_order); i++ )
+        d->arch.mm_perdomain_l2[l2_table_offset(PERDOMAIN_VIRT_START)+i] =
+            l2e_from_page(virt_to_page(d->arch.mm_perdomain_pt)+i,
+                          __PAGE_HYPERVISOR);
+
     d->arch.mm_perdomain_l3 = alloc_xenheap_page();
     memset(d->arch.mm_perdomain_l3, 0, PAGE_SIZE);
     d->arch.mm_perdomain_l3[l3_table_offset(PERDOMAIN_VIRT_START)] =
diff -r 9da47130ff42 -r c640c0c7f821 xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Thu Nov 17 11:12:57 2005
+++ b/xen/arch/x86/mm.c Thu Nov 17 11:52:42 2005
@@ -738,7 +738,7 @@
     memcpy(&pl2e[L2_PAGETABLE_FIRST_XEN_SLOT & (L2_PAGETABLE_ENTRIES-1)],
            &idle_pg_table_l2[L2_PAGETABLE_FIRST_XEN_SLOT],
            L2_PAGETABLE_XEN_SLOTS * sizeof(l2_pgentry_t));
-    for ( i = 0; i < (PERDOMAIN_MBYTES >> (L2_PAGETABLE_SHIFT - 20)); i++ )
+    for ( i = 0; i < PDPT_L2_ENTRIES; i++ )
         pl2e[l2_table_offset(PERDOMAIN_VIRT_START) + i] =
             l2e_from_page(
                 virt_to_page(page_get_owner(page)->arch.mm_perdomain_pt) + i,
diff -r 9da47130ff42 -r c640c0c7f821 xen/arch/x86/shadow.c
--- a/xen/arch/x86/shadow.c     Thu Nov 17 11:12:57 2005
+++ b/xen/arch/x86/shadow.c     Thu Nov 17 11:52:42 2005
@@ -2710,7 +2710,7 @@
            &idle_pg_table_l2[L2_PAGETABLE_FIRST_XEN_SLOT],
            L2_PAGETABLE_XEN_SLOTS * sizeof(l2_pgentry_t));       
 
-        for ( i = 0; i < (PERDOMAIN_MBYTES >> (L2_PAGETABLE_SHIFT - 20)); i++ )
+        for ( i = 0; i < PDPT_L2_ENTRIES; i++ )
             spl2e[l2_table_offset(PERDOMAIN_VIRT_START) + i] =
                 l2e_from_page(
                     
virt_to_page(page_get_owner(&frame_table[gmfn])->arch.mm_perdomain_pt) + i, 
diff -r 9da47130ff42 -r c640c0c7f821 xen/include/asm-x86/config.h
--- a/xen/include/asm-x86/config.h      Thu Nov 17 11:12:57 2005
+++ b/xen/include/asm-x86/config.h      Thu Nov 17 11:52:42 2005
@@ -291,6 +291,9 @@
 
 #define PDPT_VCPU_SHIFT       5
 #define PDPT_VCPU_VA_SHIFT    (PDPT_VCPU_SHIFT + PAGE_SHIFT)
+#define PDPT_L1_ENTRIES       (MAX_VIRT_CPUS << PDPT_VCPU_SHIFT)
+#define PDPT_L2_ENTRIES       \
+    ((PDPT_L1_ENTRIES + (1 << PAGETABLE_ORDER) - 1) >> PAGETABLE_ORDER)
 
 #if defined(__x86_64__)
 #define ELFSIZE 64

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