> I am not following the recent development of all those kernels, so I > think it's best to directly consult the individual developers/teams for > statements (like the one from Stefan above). > > For my part, I can tell you that the NOVA microhypervisor (at least the > official version) does not map physical RAM into the kernel virtual address > space, other than the RAM in which microhypervisor itself resides. NOVA maps > certain devices (like APIC, IOMMU), but those can't be speculatively > accessed anyway. I cannot comment on modified NOVA versions.
I for my part, can confirm that the slightly, cough, modified NOVA version [1], as used by Genode, kept the original behavior of the official NOVA version [0] in that regard. > Some commercial kernels and L4/Fiasco certainly used to map as much physical > memory as can fit into the kernel address space. Not sure if Fiasco.OC > retains that behavior. Check for Physmem in class Mem_layout. > > Also any kernel that performs certain things like long IPC via a lazily > flushed IPC window may have transient mappings of memory belonging > to other user processes. Thanks for the insights, Alex. [0] https://github.com/udosteinberg/NOVA [1] https://github.com/alex-ab/NOVA/tree/r9 -- Alexander Boettcher Genode Labs http://www.genode-labs.com - http://www.genode.org Genode Labs GmbH - Amtsgericht Dresden - HRB 28424 - Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
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