account for start offset on largepage aligned-sized memslots

Account for the case where memslot size is largepage aligned, but does not start on largepage aligned offset.

Otherwise it allocates one lpage_info struct less than what the memslot spans, possibly resulting in memory corruption.

index 3396a5f..93ed78b 100644
@@ -347,6 +347,9 @@ int __kvm_set_memory_region(struct kvm *kvm,
 		int largepages = npages / KVM_PAGES_PER_HPAGE;
 		if (npages % KVM_PAGES_PER_HPAGE)
 			largepages++;
+		if (base_gfn % KVM_PAGES_PER_HPAGE)
+			largepages++;
+
 		new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
 
 		if (!new.lpage_info)

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Applied, thanks.

Any sufficiently difficult bug is indistinguishable from a feature.


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