On Tue, May 24, 2016 at 09:35:54AM -0400, Dave Anderson wrote: > > > ----- Original Message ----- > > > > > > > > Now that PHYS_OFFSET is defined as "memstart_addr", we can get the > > > > value > > > > if we can access this symbol (on a live system). > > > > > > When PHYS_OFFSET/memstart_addr is bumped up from the actual base of > > > physical > > > memory, is the physical memory below it no longer used/accessible? > > > > Yes, it is! That is what Ard has managed to do in his series of > > KASLR-related patches. > > How is it accessed via a kernel virtual address? Or is only accessible when > mapped into a vmalloc() or user-space address?
Through a linear(unity) mapping above PAGE_OFFSET. -Takahiro AKASHI > Dave > > -- > Crash-utility mailing list > Crash-utility@redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility -- Crash-utility mailing list Crash-utility@redhat.com https://www.redhat.com/mailman/listinfo/crash-utility
