On 22/11/2019 11:22, Durrant, Paul wrote:
>> @@ -1144,27 +1140,22 @@ map_grant_ref(
>> if ( need_iommu )
>> {
>> unsigned int kind;
>> -int err = 0;
>>
>> double_gt_lock(lgt, rgt);
>>
>> -/* We're not translated, so we know that gmfns and mfns are
>> -
; Ian Jackson
> Subject: [Xen-devel] [PATCH] gnttab: make sure grant map operations don't
> skip their IOMMU part
>
> Two almost simultaneous mapping requests need to make sure that at the
> completion of the earlier one IOMMU mappings (established explicitly
> here in t
Two almost simultaneous mapping requests need to make sure that at the
completion of the earlier one IOMMU mappings (established explicitly
here in the PV case) have been put in place. Forever since the splitting
of the grant table lock a violation of this has been possible (using
simplified pin co
