On 12.05.21 10:50, 'Joerg Roedel' wrote:
> On Wed, May 12, 2021 at 10:16:12AM +0200, Juergen Gross wrote:
>> You want something like xen_safe_[read|write]_ulong().
> 
>  From a first glance I can't see it, what is the difference between the
> xen_safe_*_ulong() functions and __get_user()/__put_user()? The only
> difference I can see is that __get/__put_user() support different access
> sizes, but neither of those disables page-faults by itself, for example.
> 
> Couldn't these xen-specific functions not also be replaces by
> __get_user()/__put_user()?

No, those were used before, but commit 9da3f2b7405440 broke Xen's use
case. That is why I did commit 1457d8cf7664f.


Juergen