Re: [Xen-devel] [PATCH for-next v2 01/10] x86/mm: make free_perdomain_mappings idempotent

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 25/04/17 14:52, Wei Liu wrote:
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

> ---
> Cc: Tim Deegan <tim@xxxxxxx>
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
>  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


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