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usr.sbin/bhyve/mmio/mmio_virtio_console.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2016 iXsystems Inc.
* All rights reserved.
*
* This software was developed by Jakub Klama <jceel@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>
#ifndef WITHOUT_CAPSICUM
#include <sys/capsicum.h>
#endif
#include <sys/linker_set.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <dev/pci/pcireg.h>
#ifndef WITHOUT_CAPSICUM
#include <capsicum_helpers.h>
#endif
#include <err.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 <sysexits.h>
#include "bhyverun.h"
#include "debug.h"
#include "mmio_emul.h"
#include "mmio_virtio.h"
#include "mevent.h"
#include "sockstream.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) PRINTLN params
#define WPRINTF(params) PRINTLN 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;
bool vsp_open;
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;
bool vsc_ready;
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!"));
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;
char *pathcopy;
int s = -1, fd = -1, error = 0;
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
#endif
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;
}
pathcopy = strdup(path);
if (pathcopy == NULL) {
error = -1;
goto out;
}
fd = open(dirname(pathcopy), O_RDONLY | O_DIRECTORY);
if (fd < 0) {
free(pathcopy);
error = -1;
goto out;
}
sun.sun_family = AF_UNIX;
sun.sun_len = sizeof(struct sockaddr_un);
strcpy(pathcopy, path);
strlcpy(sun.sun_path, basename(pathcopy), sizeof(sun.sun_path));
free(pathcopy);
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;
}
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_ACCEPT, CAP_EVENT, CAP_READ, CAP_WRITE);
if (caph_rights_limit(s, &rights) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
#endif
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) {
if (s != -1)
close(s);
free(sock);
}
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_retchains(vq, 1);
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 i, ret;
sock = (struct pci_vtcon_sock *)arg;
if (sock->vss_conn_fd == -1)
return;
for (i = 0; i < niov; i++) {
ret = stream_write(sock->vss_conn_fd, iov[i].iov_base,
iov[i].iov_len);
if (ret <= 0)
break;
}
if (ret <= 0) {
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:
sc->vsc_ready = true;
/* 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);
if (tmp->vsp_open)
pci_vtcon_open_port(tmp, true);
}
break;
case VTCON_PORT_READY:
if (ctrl->id >= sc->vsc_nports) {
WPRINTF(("VTCON_PORT_READY event for unknown port %d",
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;
if (!port->vsp_sc->vsc_ready) {
port->vsp_open = true;
return;
}
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);
assert(n >= 1);
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_kick_disable(vq);
}
}
static int
pci_vtcon_init(struct vmctx *ctx, struct mmio_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 */
vi_devemu_init(pi, VIRTIO_TYPE_CONSOLE);
if (vi_intr_init(&sc->vsc_vs, 1, fbsdrun_virtio_msix()))
return (1);
vi_set_io_res(&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 = opt;
/* create port */
if (pci_vtcon_sock_add(sc, portname, portpath) < 0) {
EPRINTLN("cannot create port %s: %s",
portname, strerror(errno));
return (1);
}
}
return (0);
}
struct mmio_devemu pci_de_vcon = {
.de_emu = "virtio-console",
.de_init = pci_vtcon_init,
.de_write = vi_mmio_write,
.de_read = vi_mmio_read
};
MMIO_EMUL_SET(pci_de_vcon);