[Bug 205549] bhyve pci passthru stops working after guest is restarted

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205549

--- Comment #6 from arkadyi <ark at dudevich.dn.ua> ---
Hmm....I don't see in the file usr.sbin/bhyve/pci_passthru.c (origin) bellow
strings
642     pci_set_cfgdata16(pi, PCIR_COMMAND, read_config(&sc->psc_sel,
643         PCIR_COMMAND, 2));

# patch < D20623.diff 
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Index: usr.sbin/bhyve/pci_passthru.c
|===================================================================
|--- usr.sbin/bhyve/pci_passthru.c
|+++ usr.sbin/bhyve/pci_passthru.c
--------------------------
Patching file pci_passthru.c using Plan A...
Hunk #1 succeeded at 615 (offset -3 lines).
Hunk #2 succeeded at 625 (offset -3 lines).
Hunk #3 failed at 648.
1 out of 3 hunks failed--saving rejects to pci_passthru.c.rej
done

cat /usr/src/usr.sbin/bhyve/pci_passthru.c.rej
@@ -636,8 +648,13 @@
                goto done;
        }

-       pci_set_cfgdata16(pi, PCIR_COMMAND, read_config(&sc->psc_sel,
-           PCIR_COMMAND, 2));
+       /*
+        * Fetch the updated virtual command register and write it to
+        * the device if needed.
+        */
+       cmd = pci_get_cfgdata16(pi, PCIR_COMMAND);
+       if (cmd != orig_cmd)
+               write_config(&sc->psc_sel, PCIR_COMMAND, 2, cmd);

        error = 0;                              /* success */
 done:

uname -srv
FreeBSD 12.0-RELEASE-p5 FreeBSD 12.0-RELEASE-p5 r349013

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