Hi Marc, Christoffer,
While working on BE patches the following observation occurred
to me. In the same vein as Marc caught my mistake with BUG_ON
in [1] does the code have similar issue in access_vm_reg function?
In this function we have:
BUG_ON(!p->is_write);
My reading of this: if guest will issue read instruction for those
registers before HCR_TVM is cleared it will crash host kernel. Is
it right? I think guest should not crash host kvm kernel in similar
way as userspace KVM ioctl should not crash kernel. Or am I
missing something here?
V7 version of access_vm_reg has the same issue.
Thanks,
Victor
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-May/256069.html
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