[Xen-changelog] [xen-unstable] hvm svm: Bug fix for page allocation when HAP is being used

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

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1175012474 -3600
# Node ID c1bfe329f7ffd46a69264d10b790f2998345bb7b
# Parent  d4ddaff75afd0231e5d832d591196b32f8a7ecc7
hvm svm: Bug fix for page allocation when HAP is being used

Initialise count_info of newly allocated hap page with 0, and removes
unnecessary page deallcation when destroying monitor table. Without
this patch, destroying hap domain will fail.

Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
---
 xen/arch/x86/mm/hap/hap.c |   18 +++---------------
 1 files changed, 3 insertions(+), 15 deletions(-)

diff -r d4ddaff75afd -r c1bfe329f7ff xen/arch/x86/mm/hap/hap.c
--- a/xen/arch/x86/mm/hap/hap.c Tue Mar 27 16:56:20 2007 +0100
+++ b/xen/arch/x86/mm/hap/hap.c Tue Mar 27 17:21:14 2007 +0100
@@ -135,6 +135,7 @@ void hap_free_p2m_page(struct domain *d,
         HAP_ERROR("Odd p2m page count c=%#x t=%"PRtype_info"\n",
                   pg->count_info, pg->u.inuse.type_info);
     }
+    pg->count_info = 0;
     /* Free should not decrement domain's total allocation, since 
      * these pages were allocated without an owner. */
     page_set_owner(pg, NULL); 
@@ -182,6 +183,7 @@ hap_set_allocation(struct domain *d, uns
             list_del(&sp->list);
             d->arch.paging.hap.free_pages -= 1;
             d->arch.paging.hap.total_pages -= 1;
+            sp->count_info = 0;
             free_domheap_pages(sp, 0);
         }
         
@@ -367,17 +369,7 @@ void hap_destroy_monitor_table(struct vc
 {
     struct domain *d = v->domain;
 
-#if CONFIG_PAGING_LEVELS == 4
-    /* Need to destroy the l3 monitor page in slot 0 too */
-    {
-        mfn_t m3mfn;
-        l4_pgentry_t *l4e = hap_map_domain_page(mmfn);
-        ASSERT(l4e_get_flags(l4e[0]) & _PAGE_PRESENT);
-        m3mfn = _mfn(l4e_get_pfn(l4e[0]));
-        hap_free(d, m3mfn);
-        hap_unmap_domain_page(l4e);
-    }
-#elif CONFIG_PAGING_LEVELS == 3
+#if CONFIG_PAGING_LEVELS == 3
     /* Need to destroy the l2 monitor page in slot 4 too */
     {
         l3_pgentry_t *l3e = hap_map_domain_page(mmfn);
@@ -632,10 +624,6 @@ void hap_update_paging_modes(struct vcpu
 
     v->arch.paging.translate_enabled = !!hvm_paging_enabled(v);    
 
-    /* use p2m map */
-    v->arch.guest_table =
-        pagetable_from_pfn(pagetable_get_pfn(d->arch.phys_table));
-
     if ( pagetable_is_null(v->arch.monitor_table) ) {
         mfn_t mmfn = hap_make_monitor_table(v);
         v->arch.monitor_table = pagetable_from_mfn(mmfn);

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