Messages in this thread | | | Date | Tue, 16 Jul 2013 12:40:12 -0700 | Subject | Re: [PATCH v2 1/3] x86, boot: add mmio serial during compressed boot | From | Kees Cook <> |
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On Tue, Jul 16, 2013 at 12:36 PM, H. Peter Anvin <hpa@zytor.com> 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
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