Signed-off-by: Wei Liu <wei.l...@citrix.com>
Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com>
---
Cc: Tim Deegan <t...@xen.org>
Cc: George Dunlap <george.dun...@eu.citrix.com>
Cc: Jan Beulich <jbeul...@suse.com>
Cc: Andrew Cooper <andrew.coop...@citrix.com>
---
xen/arch/x86/mm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index bd68e56dc7..cdef5c49c4 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -6503,9 +6503,14 @@ void destroy_perdomain_mapping(struct domain *d,
unsigned long va,
void free_perdomain_mappings(struct domain *d)
{
- l3_pgentry_t *l3tab = __map_domain_page(d->arch.perdomain_l3_pg);
+ l3_pgentry_t *l3tab;
unsigned int i;
+ if ( !d->arch.perdomain_l3_pg )
+ return;
+
+ l3tab = __map_domain_page(d->arch.perdomain_l3_pg);
+
for ( i = 0; i < PERDOMAIN_SLOTS; ++i)
if ( l3e_get_flags(l3tab[i]) & _PAGE_PRESENT )
{
@@ -6544,6 +6549,7 @@ void free_perdomain_mappings(struct domain *d)
unmap_domain_page(l3tab);
free_domheap_page(d->arch.perdomain_l3_pg);
+ d->arch.perdomain_l3_pg = NULL;
}
#ifdef MEMORY_GUARD
--
2.11.0
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