Joerg Roedel wrote:
This patch adds the necessary data structures to take care of write
protections in place within a second huge page sized page.
+#ifdef KVM_PAGES_PER_LHPAGE
+ if (npages && !new.hpage_info) {
+ int hugepages = npages / KVM_PAGES_PER_LHPAGE;
+ if (npages % KVM_PAGES_PER_LHPAGE)
+ hugepages++;
+ if (base_gfn % KVM_PAGES_PER_LHPAGE)
+ hugepages++;
Consider a slot with base_gfn == 1 and npages == 1. This will have
hugepages == 2, which is wrong.
I think the right calculation is
((base_gfn + npages - 1) / N) - (base_gfn / N) + 1
i.e. index of last page, plus one so we can store it.
The small huge page calculation is off as well.
+
+ new.hpage_info = vmalloc(hugepages * sizeof(*new.hpage_info));
+
+ if (!new.hpage_info)
+ goto out_free;
+
+ memset(new.hpage_info, 0, hugepages * sizeof(*new.hpage_info));
+
+ if (base_gfn % KVM_PAGES_PER_LHPAGE)
+ new.hpage_info[0].write_count = 1;
+ if ((base_gfn+npages) % KVM_PAGES_PER_LHPAGE)
+ new.hpage_info[hugepages-1].write_count = 1;
+ }
+#endif
+
--
error compiling committee.c: too many arguments to function
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