On Tue, Jul 16, 2013 at 12:36 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote: > On 07/16/2013 12:31 PM, Kees Cook wrote: >> >> Could the first step be documenting the limitation? I've found this >> patch extremely useful for my case already, and I imagine there might >> be other people that need the early mmio stuff to. Generally the >> compressed boot serial console stuff is going to be used in the more >> common non-kexec situations at least for a while. >> >> Does this patch create any _problems_? Right now, neither low nor >4G >> kernel can use an mmio serial port. :) This this, we'd at least gain >> it for the low case. >> > > Even documenting the limitation is likely to end up with a bunch of > emails asking why their kernel crashed. > > I think setting up a dynamic #PF handler is the right thing for the > decompressor, we already did for the kernel proper. I'm not sure how to accomplish this yet. I'm still trying to understand how the page tables are arranged. :) -Kees -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
