[Xen-changelog] Clear all shadow caches when return to real mode from protect mode.

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 37cafca1539e429495e0bd639aa874576e3bd8b6
# Parent  7e419ba80326589db4c43c30faa6f51f113ecd5b
Clear all shadow caches when return to real mode from protect mode.
So that, if OS modify some page tables in real mode and then
return to protect mode, no outdated shadow table be used because
out of sync machanism do not work in real mode.

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@xxxxxxxxx>

diff -r 7e419ba80326 -r 37cafca1539e xen/arch/x86/shadow32.c
--- a/xen/arch/x86/shadow32.c   Thu Dec 15 19:35:32 2005
+++ b/xen/arch/x86/shadow32.c   Thu Dec 15 19:38:44 2005
@@ -2982,6 +2982,23 @@
     }
 }
 
+void clear_all_shadow_status(struct domain *d)
+{
+    shadow_lock(d);
+    free_shadow_pages(d);
+    free_shadow_ht_entries(d);
+    d->arch.shadow_ht = 
+        xmalloc_array(struct shadow_status, shadow_ht_buckets);
+    if ( d->arch.shadow_ht == NULL ) {
+        printk("clear all shadow status:xmalloc fail\n");
+        domain_crash_synchronous();
+    }
+    memset(d->arch.shadow_ht, 0,
+           shadow_ht_buckets * sizeof(struct shadow_status));
+
+    free_out_of_sync_entries(d);
+    shadow_unlock(d);
+}
 
 /************************************************************************/
 /************************************************************************/
diff -r 7e419ba80326 -r 37cafca1539e xen/arch/x86/shadow_public.c
--- a/xen/arch/x86/shadow_public.c      Thu Dec 15 19:35:32 2005
+++ b/xen/arch/x86/shadow_public.c      Thu Dec 15 19:38:44 2005
@@ -1747,6 +1747,24 @@
     shadow_unlock(d);
 }
 
+void clear_all_shadow_status(struct domain *d)
+{
+    shadow_lock(d);
+    free_shadow_pages(d);
+    free_shadow_ht_entries(d);
+    d->arch.shadow_ht = 
+        xmalloc_array(struct shadow_status, shadow_ht_buckets);
+    if ( d->arch.shadow_ht == NULL ) {
+        printk("clear all shadow status:xmalloc fail\n");
+        domain_crash_synchronous();
+    }
+    memset(d->arch.shadow_ht, 0,
+           shadow_ht_buckets * sizeof(struct shadow_status));
+
+    free_out_of_sync_entries(d);
+    shadow_unlock(d);
+}
+
 /*
  * Local variables:
  * mode: C
diff -r 7e419ba80326 -r 37cafca1539e xen/arch/x86/vmx.c
--- a/xen/arch/x86/vmx.c        Thu Dec 15 19:35:32 2005
+++ b/xen/arch/x86/vmx.c        Thu Dec 15 19:38:44 2005
@@ -1223,6 +1223,7 @@
             }
         }
 
+        clear_all_shadow_status(v->domain);
         if (vmx_assist(v, VMX_ASSIST_INVOKE)) {
             set_bit(VMX_CPU_STATE_ASSIST_ENABLED, &v->arch.arch_vmx.cpu_state);
             __vmread(GUEST_RIP, &eip);
diff -r 7e419ba80326 -r 37cafca1539e xen/include/asm-x86/shadow.h
--- a/xen/include/asm-x86/shadow.h      Thu Dec 15 19:35:32 2005
+++ b/xen/include/asm-x86/shadow.h      Thu Dec 15 19:38:44 2005
@@ -1707,6 +1707,8 @@
     }
 }
 
+void clear_all_shadow_status(struct domain *d);
+
 #if SHADOW_DEBUG
 extern int _check_pagetable(struct vcpu *v, char *s);
 extern int _check_all_pagetables(struct vcpu *v, char *s);

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