On Wed, 18 Oct 2017 14:29:24 -0700 Ram Pai <linux...@us.ibm.com> wrote:
> 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? > No, I don't understand why gup (called from driver context, probably) should worry about permissions and keys? Balbir Singh.
