On Thu, Oct 19, 2017 at 06:57:32AM +1100, Balbir Singh wrote: > On Fri, 8 Sep 2017 15:45:06 -0700 > Ram Pai <linux...@us.ibm.com> wrote: > > > Make sure that the kernel does not access user pages without > > checking their key-protection. > > > > Why? This makes the routines AMR/thread specific? Looks like > x86 does this as well
Yes. the memkey semantics implemented by x86, assumes that the keys and their access-permission are per thread. In other words, a key which is enabled in the context of one thread, will not be enabled in the context of another thread. > but these routines are used by GUP from > the kernel. See a problem? RP
