On 25/04/17 14:52, Wei Liu wrote:
> 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
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
