[Bug 256422] bhyve and Centos/Rocky 8.4 no boot after install

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256422

--- Comment #10 from Chuck Tuffli <chuck@FreeBSD.org> ---
I think nvme_write_read_blockif() has a bug:

 }

 static void
@@ -1978,7 +1984,7 @@ nvme_write_read_blockif(struct pci_nvme_softc *sc,
                /* PRP2 is pointer to a physical region page list */
                while (bytes) {
                        /* Last entry in list points to the next list */
-                       if (prp_list == last) {
+                       if ((prp_list == last) && (bytes > PAGE_SIZE)) {
                                uint64_t prp = *prp_list;

                                prp_list = paddr_guest2host(vmctx, prp,

Note that I cleaned up some additional things and your line numbers won't quite
match up. But I believe this is the crux of the fix necessary.

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