Hello All,
I have question on code of rmap_add
Here is the code of the function
613 static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
614 {
624 rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
625 if (!*rmapp) {
626 rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte);
627 *rmapp = (unsigned long)spte;
628 } else if (!(*rmapp & 1)) {
629 rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte);
630 desc = mmu_alloc_rmap_desc(vcpu);
631 desc->sptes[0] = (u64 *)*rmapp;
632 desc->sptes[1] = spte;
633 *rmapp = (unsigned long)desc | 1;
634 ++count;
635 } else {
The line 628 checks whether the last bit of the rmapp is 1.
If it is one then line 633 assigns a new value to rmapp with and sets
the last bit to 1.
But the line 633 is the only place that sets rmapp's last bit is set
to 1. IMHO the condition on line 628 would never be true.
Please let me know if I am wrong.
Thanks and Regards,
Prasad
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