[Xen-changelog] Free shadows of any pages which are released by a domain back to Xen.

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

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID d102a30417a786d12a933d98e7a2f1be629805c4
# Parent  4c2d101a3228fa27117a771121f00bc38964e89d
Free shadows of any pages which are released by a domain back to Xen.
This should fix the "Assertion '! IS_INVALID_M2P_ENTRY(gpfn)'"-crash in
free_shadow_page on domain destruction.

Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r 4c2d101a3228 -r d102a30417a7 xen/include/asm-x86/shadow.h
--- a/xen/include/asm-x86/shadow.h      Wed Mar 29 15:47:46 2006
+++ b/xen/include/asm-x86/shadow.h      Wed Mar 29 15:50:59 2006
@@ -1506,6 +1506,7 @@
     struct domain *d, unsigned long gpfn, unsigned long mfn)
 {
     struct domain_mmap_cache c1, c2;
+    unsigned long type;
 
     if ( likely(!shadow_mode_translate(d)) )
         return;
@@ -1514,6 +1515,8 @@
     domain_mmap_cache_init(&c2);
     shadow_lock(d);
     shadow_sync_and_drop_references(d, mfn_to_page(mfn));
+    while ( (type = shadow_max_pgtable_type(d, gpfn, NULL)) != PGT_none )
+        free_shadow_page(__shadow_status(d, gpfn, type));
     set_p2m_entry(d, gpfn, -1, &c1, &c2);
     set_gpfn_from_mfn(mfn, INVALID_M2P_ENTRY);
     shadow_unlock(d);

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