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diff --git a/usr.sbin/bhyve/pci_passthru.h b/usr.sbin/bhyve/pci_passthru.h
--- a/usr.sbin/bhyve/pci_passthru.h
+++ b/usr.sbin/bhyve/pci_passthru.h
@@ -53,3 +53,6 @@
struct pcisel *passthru_get_sel(struct passthru_softc *sc);
int set_pcir_handler(struct passthru_softc *sc, int reg, int len,
cfgread_handler rhandler, cfgwrite_handler whandler);
+int passthru_set_bar_handler(struct passthru_softc *sc, int baridx,
+ uint64_t off, uint64_t size, passthru_read_handler rhandler,
+ passthru_write_handler whandler);
diff --git a/usr.sbin/bhyve/pci_passthru.c b/usr.sbin/bhyve/pci_passthru.c
--- a/usr.sbin/bhyve/pci_passthru.c
+++ b/usr.sbin/bhyve/pci_passthru.c
@@ -752,6 +752,45 @@
return (0);
}
+int
+passthru_set_bar_handler(struct passthru_softc *sc, int baridx, uint64_t off,
+ uint64_t size, passthru_read_handler rhandler,
+ passthru_write_handler whandler)
+{
+ struct passthru_bar_handler *handler_new;
+ struct passthru_bar_handler *handler;
+
+ assert(sc->psc_bar[baridx].type == PCIBAR_IO ||
+ sc->psc_bar[baridx].type == PCIBAR_MEM32 ||
+ sc->psc_bar[baridx].type == PCIBAR_MEM64);
+ assert(sc->psc_bar[baridx].size >= off + size);
+ assert(off < off + size);
+
+ handler_new = malloc(sizeof(struct passthru_bar_handler));
+ if (handler_new == NULL) {
+ return (ENOMEM);
+ }
+
+ handler_new->off = off;
+ handler_new->size = size;
+ handler_new->read = rhandler;
+ handler_new->write = whandler;
+
+ TAILQ_FOREACH(handler, &sc->psc_bar_handler[baridx], chain) {
+ if (handler->off < handler_new->off) {
+ assert(handler->off + handler->size < handler_new->off);
+ continue;
+ }
+ assert(handler->off > handler_new->off + handler_new->size);
+ TAILQ_INSERT_BEFORE(handler, handler_new, chain);
+ return (0);
+ }
+
+ TAILQ_INSERT_TAIL(&sc->psc_bar_handler[baridx], handler_new, chain);
+
+ return (0);
+}
+
static int
passthru_legacy_config(nvlist_t *nvl, const char *opts)
{

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