Working with our developers for SABLE, we branched a build of SABLE for one purpose - to NOT run the AMD skinit instruction before handing off boot to NOVA/Genode. Using this build of SABLE we are able to get a successful boot to the demo.
At this stage, it seems that something fundamental changed within Genode and/or NOVA (and I have also seen this with Genode/seL4 demo) that causes the memory fault to occur on AMD platforms ONLY when the skinit instruction is performed prior to boot hand-off. Is this a point where we can dig a little deeper to understand where this problem is occurring?
Chris Rothrock
On Wed, May 23, 2018 at 2:36 PM, Chris Rothrock cgrothrock@gmail.com wrote:
I have tried this also with the 32 bit with the same results.
On Wed, May 23, 2018 at 2:16 PM, Christian Helmuth < christian.helmuth@genode-labs.com> wrote:
Hello Chris,
On Tue, May 22, 2018 at 02:22:33PM -0400, Chris Rothrock wrote:
########################################################## ### Without SABLE Boot Module ### ##########################################################
NOVA Microhypervisor v7-ef4b287 (x86_32): May 10 2018 10:39:11 [gcc
6.3.0] [...]
########################################################## ### With SABLE Boot Module ### ##########################################################
NOVA Microhypervisor v7-ef4b287 (x86_64): Feb 9 2018 14:02:24 [gcc
6.3.0]
Additionally to using SABLE in the second boot you also run NOVA x86_64 unlike the SABLE-less boot of NOVA x86_32. Did you also check the two remaining combinations - no SABLE x86_64 and SABLE with x86_32?
Beside this difference I can't see anything leaping to the eye. Do other (more simple tests like run/log) also fail with a page fault that early?
Greets
Christian Helmuth Genode Labs
https://www.genode-labs.com/ · https://genode.org/ https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/
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Thank You,
Chris Rothrock Senior System Administrator (315) 308-1637