Hello,
I'm trying to track down a bug I'm observing in a branched version of
kvm I'm using for research. I'm hoping someone might be able to point
me int to the right direction as I haven't had any luck with it on my
own. Here are the details:
I have made some changes to kvm that enable guest user applications to
use duplicate shadow pages to do interesting things (essentially I
duplicate the shadow page table tree for a process multiple times, once
for each thread). During my tests, my guest application enables this
new feature, completes correctly, and then disables it. Unfortunately,
after the test application completes, random programs begin segfaulting
for unknown reasons. This is despite the fact that my changes to KVM no
longer get executed (verified with a kgdb). At first I thought that I
corrupted the shadow pages tables somehow, however, calling
kvm_mmu_zap_all does not solve the problem. Thus, I figured I corrupted
the guest OS somehow, however, the problem persists even if I reboot the
guest OS.
So my question is this: Are there any other data structures that survive
both a call to kvm_mmu_zap and a guest reboot?
Thanks!
Marek
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