This revision was automatically updated to reflect the committed changes.
Closed by commit rS305898: Add virtio-console support to bhyve. (authored by 
jceel).

CHANGED PRIOR TO COMMIT
  https://reviews.freebsd.org/D7185?vs=20401&id=20402#toc

REPOSITORY
  rS FreeBSD src repository

CHANGES SINCE LAST UPDATE
  https://reviews.freebsd.org/D7185?vs=20401&id=20402

REVISION DETAIL
  https://reviews.freebsd.org/D7185

AFFECTED FILES
  head/usr.sbin/bhyve/Makefile
  head/usr.sbin/bhyve/pci_virtio_console.c
  head/usr.sbin/bhyve/virtio.h

EMAIL PREFERENCES
  https://reviews.freebsd.org/settings/panel/emailpreferences/

To: jceel, grehan, trasz
Cc: imp, freebsd-virtualization-list
diff --git a/head/usr.sbin/bhyve/virtio.h b/head/usr.sbin/bhyve/virtio.h
--- a/head/usr.sbin/bhyve/virtio.h
+++ b/head/usr.sbin/bhyve/virtio.h
@@ -210,6 +210,7 @@
 #define	VIRTIO_DEV_NET		0x1000
 #define	VIRTIO_DEV_BLOCK	0x1001
 #define	VIRTIO_DEV_RANDOM	0x1002
+#define	VIRTIO_DEV_CONSOLE	0x1003
 
 /*
  * PCI config space constants.
diff --git a/head/usr.sbin/bhyve/pci_virtio_console.c b/head/usr.sbin/bhyve/pci_virtio_console.c
--- a/head/usr.sbin/bhyve/pci_virtio_console.c
+++ b/head/usr.sbin/bhyve/pci_virtio_console.c
@@ -0,0 +1,631 @@
+/*-
+ * Copyright (c) 2016 iXsystems Inc.
+ * All rights reserved.
+ *
+ * This software was developed by Jakub Klama <jc...@freebsd.org>
+ * under sponsorship from iXsystems Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/linker_set.h>
+#include <sys/uio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+#include <pthread.h>
+#include <libgen.h>
+
+#include "bhyverun.h"
+#include "pci_emul.h"
+#include "virtio.h"
+#include "mevent.h"
+
+#define	VTCON_RINGSZ	64
+#define	VTCON_MAXPORTS	16
+#define	VTCON_MAXQ	(VTCON_MAXPORTS * 2 + 2)
+
+#define	VTCON_DEVICE_READY	0
+#define	VTCON_DEVICE_ADD	1
+#define	VTCON_DEVICE_REMOVE	2
+#define	VTCON_PORT_READY	3
+#define	VTCON_CONSOLE_PORT	4
+#define	VTCON_CONSOLE_RESIZE	5
+#define	VTCON_PORT_OPEN		6
+#define	VTCON_PORT_NAME		7
+
+#define	VTCON_F_SIZE		0
+#define	VTCON_F_MULTIPORT	1
+#define	VTCON_F_EMERG_WRITE	2
+#define	VTCON_S_HOSTCAPS	\
+    (VTCON_F_SIZE | VTCON_F_MULTIPORT | VTCON_F_EMERG_WRITE)
+
+static int pci_vtcon_debug;
+#define DPRINTF(params) if (pci_vtcon_debug) printf params
+#define WPRINTF(params) printf params
+
+struct pci_vtcon_softc;
+struct pci_vtcon_port;
+struct pci_vtcon_config;
+typedef void (pci_vtcon_cb_t)(struct pci_vtcon_port *, void *, struct iovec *,
+    int);
+
+struct pci_vtcon_port {
+	struct pci_vtcon_softc * vsp_sc;
+	int                      vsp_id;
+	const char *             vsp_name;
+	bool                     vsp_enabled;
+	bool                     vsp_console;
+	bool                     vsp_rx_ready;
+	int                      vsp_rxq;
+	int                      vsp_txq;
+	void *                   vsp_arg;
+	pci_vtcon_cb_t *         vsp_cb;
+};
+
+struct pci_vtcon_sock
+{
+	struct pci_vtcon_port *  vss_port;
+	const char *             vss_path;
+	struct mevent *          vss_server_evp;
+	struct mevent *          vss_conn_evp;
+	int                      vss_server_fd;
+	int                      vss_conn_fd;
+	bool                     vss_open;
+};
+
+struct pci_vtcon_softc {
+	struct virtio_softc      vsc_vs;
+	struct vqueue_info       vsc_queues[VTCON_MAXQ];
+	pthread_mutex_t          vsc_mtx;
+	uint64_t                 vsc_cfg;
+	uint64_t                 vsc_features;
+	char *                   vsc_rootdir;
+	int                      vsc_kq;
+	int                      vsc_nports;
+	struct pci_vtcon_port    vsc_control_port;
+ 	struct pci_vtcon_port    vsc_ports[VTCON_MAXPORTS];
+	struct pci_vtcon_config *vsc_config;
+};
+
+struct pci_vtcon_config {
+	uint16_t cols;
+	uint16_t rows;
+	uint32_t max_nr_ports;
+	uint32_t emerg_wr;
+} __attribute__((packed));
+
+struct pci_vtcon_control {
+	uint32_t id;
+	uint16_t event;
+	uint16_t value;
+} __attribute__((packed));
+
+struct pci_vtcon_console_resize {
+	uint16_t cols;
+	uint16_t rows;
+} __attribute__((packed));
+
+static void pci_vtcon_reset(void *);
+static void pci_vtcon_notify_rx(void *, struct vqueue_info *);
+static void pci_vtcon_notify_tx(void *, struct vqueue_info *);
+static int pci_vtcon_cfgread(void *, int, int, uint32_t *);
+static int pci_vtcon_cfgwrite(void *, int, int, uint32_t);
+static void pci_vtcon_neg_features(void *, uint64_t);
+static void pci_vtcon_sock_accept(int, enum ev_type,  void *);
+static void pci_vtcon_sock_rx(int, enum ev_type, void *);
+static void pci_vtcon_sock_tx(struct pci_vtcon_port *, void *, struct iovec *,
+    int);
+static void pci_vtcon_control_send(struct pci_vtcon_softc *,
+    struct pci_vtcon_control *, const void *, size_t);
+static void pci_vtcon_announce_port(struct pci_vtcon_port *);
+static void pci_vtcon_open_port(struct pci_vtcon_port *, bool);
+
+static struct virtio_consts vtcon_vi_consts = {
+	"vtcon",		/* our name */
+	VTCON_MAXQ,		/* we support VTCON_MAXQ virtqueues */
+	sizeof(struct pci_vtcon_config), /* config reg size */
+	pci_vtcon_reset,	/* reset */
+	NULL,			/* device-wide qnotify */
+	pci_vtcon_cfgread,	/* read virtio config */
+	pci_vtcon_cfgwrite,	/* write virtio config */
+	pci_vtcon_neg_features,	/* apply negotiated features */
+	VTCON_S_HOSTCAPS,	/* our capabilities */
+};
+
+
+static void
+pci_vtcon_reset(void *vsc)
+{
+	struct pci_vtcon_softc *sc;
+
+	sc = vsc;
+
+	DPRINTF(("vtcon: device reset requested!\n"));
+	vi_reset_dev(&sc->vsc_vs);
+}
+
+static void
+pci_vtcon_neg_features(void *vsc, uint64_t negotiated_features)
+{
+	struct pci_vtcon_softc *sc = vsc;
+
+	sc->vsc_features = negotiated_features;
+}
+
+static int
+pci_vtcon_cfgread(void *vsc, int offset, int size, uint32_t *retval)
+{
+	struct pci_vtcon_softc *sc = vsc;
+	void *ptr;
+
+	ptr = (uint8_t *)sc->vsc_config + offset;
+	memcpy(retval, ptr, size);
+	return (0);
+}
+
+static int
+pci_vtcon_cfgwrite(void *vsc, int offset, int size, uint32_t val)
+{
+
+	return (0);
+}
+
+static inline struct pci_vtcon_port *
+pci_vtcon_vq_to_port(struct pci_vtcon_softc *sc, struct vqueue_info *vq)
+{
+	uint16_t num = vq->vq_num;
+
+	if (num == 0 || num == 1)
+		return (&sc->vsc_ports[0]);
+
+	if (num == 2 || num == 3)
+		return (&sc->vsc_control_port);
+
+	return (&sc->vsc_ports[(num / 2) - 1]);
+}
+
+static inline struct vqueue_info *
+pci_vtcon_port_to_vq(struct pci_vtcon_port *port, bool tx_queue)
+{
+	int qnum;
+
+	qnum = tx_queue ? port->vsp_txq : port->vsp_rxq;
+	return (&port->vsp_sc->vsc_queues[qnum]);
+}
+
+static struct pci_vtcon_port *
+pci_vtcon_port_add(struct pci_vtcon_softc *sc, const char *name,
+    pci_vtcon_cb_t *cb, void *arg)
+{
+	struct pci_vtcon_port *port;
+
+	if (sc->vsc_nports == VTCON_MAXPORTS) {
+		errno = EBUSY;
+		return (NULL);
+	}
+
+	port = &sc->vsc_ports[sc->vsc_nports++];
+	port->vsp_id = sc->vsc_nports - 1;
+	port->vsp_sc = sc;
+	port->vsp_name = name;
+	port->vsp_cb = cb;
+	port->vsp_arg = arg;
+
+	if (port->vsp_id == 0) {
+		/* port0 */
+		port->vsp_txq = 0;
+		port->vsp_rxq = 1;
+	} else {
+		port->vsp_txq = sc->vsc_nports * 2;
+		port->vsp_rxq = port->vsp_txq + 1;
+	}
+
+	port->vsp_enabled = true;
+	return (port);
+}
+
+static int
+pci_vtcon_sock_add(struct pci_vtcon_softc *sc, const char *name,
+    const char *path)
+{
+	struct pci_vtcon_sock *sock;
+	struct sockaddr_un sun;
+	int s = -1, fd = -1, error = 0;
+
+	sock = calloc(1, sizeof(struct pci_vtcon_sock));
+	if (sock == NULL) {
+		error = -1;
+		goto out;
+	}
+
+	s = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (s < 0) {
+		error = -1;
+		goto out;
+	}
+
+	fd = open(dirname(path), O_RDONLY | O_DIRECTORY);
+	if (fd < 0) {
+		error = -1;
+		goto out;
+	}
+
+	sun.sun_family = AF_UNIX;
+	sun.sun_len = sizeof(struct sockaddr_un);
+	strncpy(sun.sun_path, basename((char *)path), sizeof(sun.sun_path));
+
+	if (bindat(fd, s, (struct sockaddr *)&sun, sun.sun_len) < 0) {
+		error = -1;
+		goto out;
+	}
+
+	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
+		error = -1;
+		goto out;
+	}
+
+	if (listen(s, 1) < 0) {
+		error = -1;
+		goto out;
+	}
+
+
+	sock->vss_port = pci_vtcon_port_add(sc, name, pci_vtcon_sock_tx, sock);
+	if (sock->vss_port == NULL) {
+		error = -1;
+		goto out;
+	}
+
+	sock->vss_open = false;
+	sock->vss_conn_fd = -1;
+	sock->vss_server_fd = s;
+	sock->vss_server_evp = mevent_add(s, EVF_READ, pci_vtcon_sock_accept,
+	    sock);
+
+	if (sock->vss_server_evp == NULL) {
+		error = -1;
+		goto out;
+	}
+
+out:
+	if (fd != -1)
+		close(fd);
+
+	if (error != 0 && s != -1)
+		close(s);
+
+	return (error);
+}
+
+static void
+pci_vtcon_sock_accept(int fd __unused, enum ev_type t __unused, void *arg)
+{
+	struct pci_vtcon_sock *sock = (struct pci_vtcon_sock *)arg;
+	int s;
+
+	s = accept(sock->vss_server_fd, NULL, NULL);
+	if (s < 0)
+		return;
+
+	if (sock->vss_open) {
+		close(s);
+		return;
+	}
+
+	sock->vss_open = true;
+	sock->vss_conn_fd = s;
+	sock->vss_conn_evp = mevent_add(s, EVF_READ, pci_vtcon_sock_rx, sock);
+	pci_vtcon_open_port(sock->vss_port, true);
+}
+
+static void
+pci_vtcon_sock_rx(int fd __unused, enum ev_type t __unused, void *arg)
+{
+	struct pci_vtcon_port *port;
+	struct pci_vtcon_sock *sock = (struct pci_vtcon_sock *)arg;
+	struct vqueue_info *vq;
+	struct iovec iov;
+	static char dummybuf[2048];
+	int len, n;
+	uint16_t idx;
+
+	port = sock->vss_port;
+	vq = pci_vtcon_port_to_vq(port, true);
+
+	if (!sock->vss_open || !port->vsp_rx_ready) {
+		len = read(sock->vss_conn_fd, dummybuf, sizeof(dummybuf));
+		if (len == 0)
+			goto close;
+
+		return;
+	}
+
+	if (!vq_has_descs(vq)) {
+		len = read(sock->vss_conn_fd, dummybuf, sizeof(dummybuf));
+		vq_endchains(vq, 1);
+		if (len == 0)
+			goto close;
+
+		return;
+	}
+
+	do {
+		n = vq_getchain(vq, &idx, &iov, 1, NULL);
+		len = readv(sock->vss_conn_fd, &iov, n);
+
+		if (len == 0 || (len < 0 && errno == EWOULDBLOCK)) {
+			vq_retchain(vq);
+			vq_endchains(vq, 0);
+			if (len == 0)
+				goto close;
+
+			return;
+		}
+
+		vq_relchain(vq, idx, len);
+	} while (vq_has_descs(vq));
+
+	vq_endchains(vq, 1);
+
+close:
+	mevent_delete_close(sock->vss_conn_evp);
+	sock->vss_conn_fd = -1;
+	sock->vss_open = false;
+}
+
+static void
+pci_vtcon_sock_tx(struct pci_vtcon_port *port, void *arg, struct iovec *iov,
+    int niov)
+{
+	struct pci_vtcon_sock *sock;
+	int ret;
+
+	sock = (struct pci_vtcon_sock *)arg;
+
+	if (sock->vss_conn_fd == -1)
+		return;
+
+	ret = writev(sock->vss_conn_fd, iov, niov);
+
+	if (ret < 0 && errno != EWOULDBLOCK) {
+		mevent_delete_close(sock->vss_conn_evp);
+		sock->vss_conn_fd = -1;
+		sock->vss_open = false;
+	}
+}
+
+static void
+pci_vtcon_control_tx(struct pci_vtcon_port *port, void *arg, struct iovec *iov,
+    int niov)
+{
+	struct pci_vtcon_softc *sc;
+	struct pci_vtcon_port *tmp;
+	struct pci_vtcon_control resp, *ctrl;
+	int i;
+
+	assert(niov == 1);
+
+	sc = port->vsp_sc;
+	ctrl = (struct pci_vtcon_control *)iov->iov_base;
+
+	switch (ctrl->event) {
+	case VTCON_DEVICE_READY:
+		/* set port ready events for registered ports */
+		for (i = 0; i < VTCON_MAXPORTS; i++) {
+			tmp = &sc->vsc_ports[i];
+			if (tmp->vsp_enabled)
+				pci_vtcon_announce_port(tmp);
+		}
+		break;
+
+	case VTCON_PORT_READY:
+		if (ctrl->id >= sc->vsc_nports) {
+			WPRINTF(("VTCON_PORT_READY event for unknown port %d\n",
+			    ctrl->id));
+			return;
+		}
+
+		tmp = &sc->vsc_ports[ctrl->id];
+		if (tmp->vsp_console) {
+			resp.event = VTCON_CONSOLE_PORT;
+			resp.id = ctrl->id;
+			resp.value = 1;
+			pci_vtcon_control_send(sc, &resp, NULL, 0);
+		}
+		break;
+	}
+}
+
+static void
+pci_vtcon_announce_port(struct pci_vtcon_port *port)
+{
+	struct pci_vtcon_control event;
+
+	event.id = port->vsp_id;
+	event.event = VTCON_DEVICE_ADD;
+	event.value = 1;
+	pci_vtcon_control_send(port->vsp_sc, &event, NULL, 0);
+
+	event.event = VTCON_PORT_NAME;
+	pci_vtcon_control_send(port->vsp_sc, &event, port->vsp_name,
+	    strlen(port->vsp_name));
+}
+
+static void
+pci_vtcon_open_port(struct pci_vtcon_port *port, bool open)
+{
+	struct pci_vtcon_control event;
+
+	event.id = port->vsp_id;
+	event.event = VTCON_PORT_OPEN;
+	event.value = (int)open;
+	pci_vtcon_control_send(port->vsp_sc, &event, NULL, 0);
+}
+
+static void
+pci_vtcon_control_send(struct pci_vtcon_softc *sc,
+    struct pci_vtcon_control *ctrl, const void *payload, size_t len)
+{
+	struct vqueue_info *vq;
+	struct iovec iov;
+	uint16_t idx;
+	int n;
+
+	vq = pci_vtcon_port_to_vq(&sc->vsc_control_port, true);
+
+	if (!vq_has_descs(vq))
+		return;
+
+	n = vq_getchain(vq, &idx, &iov, 1, NULL);
+
+	assert(n == 1);
+
+	memcpy(iov.iov_base, ctrl, sizeof(struct pci_vtcon_control));
+	if (payload != NULL && len > 0)
+		memcpy(iov.iov_base + sizeof(struct pci_vtcon_control),
+		     payload, len);
+
+	vq_relchain(vq, idx, sizeof(struct pci_vtcon_control) + len);
+	vq_endchains(vq, 1);
+}
+    
+
+static void
+pci_vtcon_notify_tx(void *vsc, struct vqueue_info *vq)
+{
+	struct pci_vtcon_softc *sc;
+	struct pci_vtcon_port *port;
+	struct iovec iov[1];
+	uint16_t idx, n;
+	uint16_t flags[8];
+
+	sc = vsc;
+	port = pci_vtcon_vq_to_port(sc, vq);
+
+	while (vq_has_descs(vq)) {
+		n = vq_getchain(vq, &idx, iov, 1, flags);
+		if (port != NULL)
+			port->vsp_cb(port, port->vsp_arg, iov, 1);
+
+		/*
+		 * Release this chain and handle more
+		 */
+		vq_relchain(vq, idx, 0);
+	}
+	vq_endchains(vq, 1);	/* Generate interrupt if appropriate. */
+}
+
+static void
+pci_vtcon_notify_rx(void *vsc, struct vqueue_info *vq)
+{
+	struct pci_vtcon_softc *sc;
+	struct pci_vtcon_port *port;
+
+	sc = vsc;
+	port = pci_vtcon_vq_to_port(sc, vq);
+
+	if (!port->vsp_rx_ready) {
+		port->vsp_rx_ready = 1;
+		vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
+	}
+}
+
+static int
+pci_vtcon_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
+{
+	struct pci_vtcon_softc *sc;
+	char *portname = NULL;
+	char *portpath = NULL;
+	char *opt;
+	int i;	
+
+	sc = calloc(1, sizeof(struct pci_vtcon_softc));
+	sc->vsc_config = calloc(1, sizeof(struct pci_vtcon_config));
+	sc->vsc_config->max_nr_ports = VTCON_MAXPORTS;
+	sc->vsc_config->cols = 80;
+	sc->vsc_config->rows = 25; 
+
+	vi_softc_linkup(&sc->vsc_vs, &vtcon_vi_consts, sc, pi, sc->vsc_queues);
+	sc->vsc_vs.vs_mtx = &sc->vsc_mtx;
+
+	for (i = 0; i < VTCON_MAXQ; i++) {
+		sc->vsc_queues[i].vq_qsize = VTCON_RINGSZ;
+		sc->vsc_queues[i].vq_notify = i % 2 == 0
+		    ? pci_vtcon_notify_rx
+		    : pci_vtcon_notify_tx;
+	}
+
+	/* initialize config space */
+	pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_CONSOLE);
+	pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
+	pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_SIMPLECOMM);
+	pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_CONSOLE);
+	pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR);
+
+	if (vi_intr_init(&sc->vsc_vs, 1, fbsdrun_virtio_msix()))
+		return (1);
+	vi_set_io_bar(&sc->vsc_vs, 0);
+
+	/* create control port */
+	sc->vsc_control_port.vsp_sc = sc;
+	sc->vsc_control_port.vsp_txq = 2;
+	sc->vsc_control_port.vsp_rxq = 3;
+	sc->vsc_control_port.vsp_cb = pci_vtcon_control_tx;
+	sc->vsc_control_port.vsp_enabled = true;
+
+	while ((opt = strsep(&opts, ",")) != NULL) {
+		portname = strsep(&opt, "=");
+		portpath = strdup(opt);
+
+		/* create port */
+		if (pci_vtcon_sock_add(sc, portname, portpath) < 0) {
+			fprintf(stderr, "cannot create port %s: %s\n",
+			    portname, strerror(errno));
+			return (1);
+		}
+	}
+
+	return (0);
+}
+
+struct pci_devemu pci_de_vcon = {
+	.pe_emu =	"virtio-console",
+	.pe_init =	pci_vtcon_init,
+	.pe_barwrite =	vi_pci_write,
+	.pe_barread =	vi_pci_read
+};
+PCI_EMUL_SET(pci_de_vcon);
diff --git a/head/usr.sbin/bhyve/Makefile b/head/usr.sbin/bhyve/Makefile
--- a/head/usr.sbin/bhyve/Makefile
+++ b/head/usr.sbin/bhyve/Makefile
@@ -36,6 +36,7 @@
 	pci_lpc.c		\
 	pci_passthru.c		\
 	pci_virtio_block.c	\
+	pci_virtio_console.c	\
 	pci_virtio_net.c	\
 	pci_virtio_rnd.c	\
 	pci_uart.c		\

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