5 files changed, 8 insertions, 0 deletions

diff --git a/usr.sbin/bhyve/pci_virtio_block.c b/usr.sbin/bhyve/pci_virtio_block.c
index cf1c65557015d..394b116b3028e 100644
--- a/usr.sbin/bhyve/pci_virtio_block.c
+++ b/usr.sbin/bhyve/pci_virtio_block.c
@@ -133,6 +133,7 @@ static struct virtio_consts vtblk_vi_consts = {
 	pci_vtblk_notify,	/* device-wide qnotify */
 	pci_vtblk_cfgread,	/* read PCI config */
 	pci_vtblk_cfgwrite,	/* write PCI config */
+	NULL,			/* apply negotiated features */
 	VTBLK_S_HOSTCAPS,	/* our capabilities */
 };
 
diff --git a/usr.sbin/bhyve/pci_virtio_net.c b/usr.sbin/bhyve/pci_virtio_net.c
index c3b8690bb6e01..c9ab972fa443b 100644
--- a/usr.sbin/bhyve/pci_virtio_net.c
+++ b/usr.sbin/bhyve/pci_virtio_net.c
@@ -160,6 +160,7 @@ static struct virtio_consts vtnet_vi_consts = {
 	NULL,			/* device-wide qnotify -- not used */
 	pci_vtnet_cfgread,	/* read PCI config */
 	pci_vtnet_cfgwrite,	/* write PCI config */
+	NULL,			/* apply negotiated features */
 	VTNET_S_HOSTCAPS,	/* our capabilities */
 };
 
diff --git a/usr.sbin/bhyve/pci_virtio_rnd.c b/usr.sbin/bhyve/pci_virtio_rnd.c
index 4d531834cbe2d..0a31080114c00 100644
--- a/usr.sbin/bhyve/pci_virtio_rnd.c
+++ b/usr.sbin/bhyve/pci_virtio_rnd.c
@@ -80,6 +80,7 @@ static struct virtio_consts vtrnd_vi_consts = {
 	pci_vtrnd_notify,	/* device-wide qnotify */
 	NULL,			/* read virtio config */
 	NULL,			/* write virtio config */
+	NULL,			/* apply negotiated features */
 	0,			/* our capabilities */
 };
 
diff --git a/usr.sbin/bhyve/virtio.c b/usr.sbin/bhyve/virtio.c
index 2f04b90ab44fe..19c0d4710d281 100644
--- a/usr.sbin/bhyve/virtio.c
+++ b/usr.sbin/bhyve/virtio.c
@@ -698,6 +698,9 @@ bad:
 	switch (offset) {
 	case VTCFG_R_GUESTCAP:
 		vs->vs_negotiated_caps = value & vc->vc_hv_caps;
+		if (vc->vc_apply_features)
+			(*vc->vc_apply_features)(DEV_SOFTC(vs),
+			    vs->vs_negotiated_caps);
 		break;
 	case VTCFG_R_PFN:
 		if (vs->vs_curq >= vc->vc_nvq)
diff --git a/usr.sbin/bhyve/virtio.h b/usr.sbin/bhyve/virtio.h
index 1f29dfa8ef734..6f655f3f79800 100644
--- a/usr.sbin/bhyve/virtio.h
+++ b/usr.sbin/bhyve/virtio.h
@@ -352,6 +352,8 @@ struct virtio_consts {
 					/* called to read config regs */
 	int	(*vc_cfgwrite)(void *, int, int, uint32_t);
 					/* called to write config regs */
+	void    (*vc_apply_features)(void *, uint64_t);
+				/* called to apply negotiated features */
 	uint64_t vc_hv_caps;		/* hypervisor-provided capabilities */
 };