Hi there,
I have tried to log EPT construction status at VM startup, that is to
add some codes in function __direct_map (arch/x86/kvm/mmu.c).
__direct_map constructs the EPT paging structure when a guest page
firstly touched, and I can get related gfn and pfn here.
But I tracked a strange address, which is "vcpu 0 pfn
0x8000000000000000 gfn 0xfebf1". Here pfn and gfn are the value of
the params in function __direct_map. How can pfn be
0x8000000000000000? Besides, I searched 0xfebf1 in kvm->memslots and
cannot get it in any memslots, but __direct_map catches this memory
access and build the mapping. Why should this happen?
Thanks ahead,
Arthur
A1. Here's my code in __direct_map:
for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) {
if (iterator.level == level) {
printk(KERN_NOTICE "vcpu %d\tpfn 0x%llx\tgfn 0x%llx\n",
kvm->tm_turn, vcpu->vcpu_id, pfn, gfn);
}
mmu_set_spte(vcpu, iterator.sptep, ACC_ALL,
write, &emulate, level, gfn, pfn,
prefault, map_writable);
direct_pte_prefetch(vcpu, iterator.sptep);
++vcpu->stat.pf_fixed;
break;
}
--
Arthur Chunqi Li
Department of Computer Science
School of EECS
Peking University
Beijing, China
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