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diff --git a/usr.sbin/bhyve/amd64/e820.c b/usr.sbin/bhyve/amd64/e820.c
--- a/usr.sbin/bhyve/amd64/e820.c
+++ b/usr.sbin/bhyve/amd64/e820.c
@@ -210,7 +210,19 @@
(base < element->base || end > element->end))
return (ENOMEM);
- if (base == element->base) {
+ if (base == element->base && end == element->end) {
+ /*
+ * The new entry replaces an existing one.
+ *
+ * Old table:
+ * [ 0x1000, 0x4000] RAM <-- element
+ * New table:
+ * [ 0x1000, 0x4000] Reserved
+ */
+ TAILQ_INSERT_BEFORE(element, new_element, chain);
+ TAILQ_REMOVE(&e820_table, element, chain);
+ free(element);
+ } else if (base == element->base) {
/*
* New element at system memory base boundary. Add new
* element before current and adjust the base of the old

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