Resynchronize the guest RTC via vmmci(4) on host resume from zzz/ZZZ

(kernel part)

This feature is for OpenBSD guests only.

ok reyk, kettenis

diff --git a/sys/dev/pv/vmmci.c b/sys/dev/pv/vmmci.c
index ee9c7c1..ac44e54 100644 (file)
--- a/sys/dev/pv/vmmci.c
+++ b/sys/dev/pv/vmmci.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: vmmci.c,v 1.2 2017/03/15 18:06:18 reyk Exp $  */
+/*     $OpenBSD: vmmci.c,v 1.3 2017/05/02 09:50:38 mlarkin Exp $       */
 
 /*
  * Copyright (c) 2017 Reyk Floeter <reyk@openbsd.org>
@@ -37,6 +37,7 @@ enum vmmci_cmd {
        VMMCI_NONE = 0,
        VMMCI_SHUTDOWN,
        VMMCI_REBOOT,
+       VMMCI_SYNCRTC,
 };
 
 struct vmmci_softc {
@@ -73,6 +74,7 @@ struct cfattach vmmci_ca = {
 /* Feature bits */
 #define VMMCI_F_TIMESYNC       (1<<0)
 #define VMMCI_F_ACK            (1<<1)
+#define VMMCI_F_SYNCRTC                (1<<2)
 
 struct cfdriver vmmci_cd = {
        NULL, "vmmci", DV_DULL
@@ -103,7 +105,7 @@ vmmci_attach(struct device *parent, struct device *self, void *aux)
        vsc->sc_ipl = IPL_NET;
        sc->sc_virtio = vsc;
 
-       features = VMMCI_F_TIMESYNC|VMMCI_F_ACK;
+       features = VMMCI_F_TIMESYNC | VMMCI_F_ACK | VMMCI_F_SYNCRTC;
        features = virtio_negotiate_features(vsc, features, NULL);
 
        if (features & VMMCI_F_TIMESYNC) {
@@ -171,6 +173,10 @@ vmmci_config_change(struct virtio_softc *vsc)
        case VMMCI_REBOOT:
                pvbus_reboot(&sc->sc_dev);
                break;
+       case VMMCI_SYNCRTC:
+               inittodr(time_second);
+               sc->sc_cmd = VMMCI_NONE;
+               break;  
        default:
                printf("%s: invalid command %d\n", sc->sc_dev.dv_xname, cmd);
                cmd = VMMCI_NONE;