Allow bhyve and bhyveload to attach to tty devices.
bhyveload: introduce the -c <device> parameter to select a tty for output (or "stdio") bhyve: allow the puc and lpc-com backends to accept a tty in addition to "stdio" When used in conjunction with the null-modem device, nmdm(4), this allows attach/detach to the guest console and multiple concurrent serial ports. kgdb on a serial port is now functional. Reviewed by: neel Requested by: Almost everyone that has used bhyve MFC after: 10.0
This commit is contained in:
Peter Grehan
parent
0d8dc7cc39
commit
6380102c7f
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=258668
@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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#include <stdbool.h>
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@ -67,6 +68,7 @@ __FBSDID("$FreeBSD$");
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#define FIFOSZ 16
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static bool uart_stdio; /* stdio in use for i/o */
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static struct termios tio_stdio_orig;
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static struct {
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int baseaddr;
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@ -87,6 +89,12 @@ struct fifo {
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int size; /* size of the fifo */
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};
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struct ttyfd {
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bool opened;
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int fd; /* tty device file descriptor */
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struct termios tio_orig, tio_new; /* I/O Terminals */
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};
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struct uart_softc {
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pthread_mutex_t mtx; /* protects all softc elements */
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uint8_t data; /* Data register (R/W) */
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@ -103,8 +111,7 @@ struct uart_softc {
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struct fifo rxfifo;
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bool opened;
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bool stdio;
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struct ttyfd tty;
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bool thre_int_pending; /* THRE interrupt pending */
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void *arg;
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@ -114,38 +121,41 @@ struct uart_softc {
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static void uart_drain(int fd, enum ev_type ev, void *arg);
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static struct termios tio_orig, tio_new; /* I/O Terminals */
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static void
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ttyclose(void)
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{
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tcsetattr(STDIN_FILENO, TCSANOW, &tio_orig);
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tcsetattr(STDIN_FILENO, TCSANOW, &tio_stdio_orig);
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}
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static void
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ttyopen(void)
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ttyopen(struct ttyfd *tf)
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{
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tcgetattr(STDIN_FILENO, &tio_orig);
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tcgetattr(tf->fd, &tf->tio_orig);
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cfmakeraw(&tio_new);
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tcsetattr(STDIN_FILENO, TCSANOW, &tio_new);
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tf->tio_new = tf->tio_orig;
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cfmakeraw(&tf->tio_new);
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tf->tio_new.c_cflag |= CLOCAL;
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tcsetattr(tf->fd, TCSANOW, &tf->tio_new);
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atexit(ttyclose);
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if (tf->fd == STDIN_FILENO) {
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tio_stdio_orig = tf->tio_orig;
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atexit(ttyclose);
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}
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}
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static bool
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tty_char_available(void)
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tty_char_available(struct ttyfd *tf)
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{
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fd_set rfds;
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struct timeval tv;
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FD_ZERO(&rfds);
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FD_SET(STDIN_FILENO, &rfds);
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FD_SET(tf->fd, &rfds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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if (select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv) > 0 ) {
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if (select(tf->fd + 1, &rfds, NULL, NULL, &tv) > 0 ) {
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return (true);
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} else {
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return (false);
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@ -153,12 +163,12 @@ tty_char_available(void)
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}
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static int
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ttyread(void)
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ttyread(struct ttyfd *tf)
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{
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char rb;
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if (tty_char_available()) {
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read(STDIN_FILENO, &rb, 1);
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if (tty_char_available(tf)) {
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read(tf->fd, &rb, 1);
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return (rb & 0xff);
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} else {
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return (-1);
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@ -166,10 +176,10 @@ ttyread(void)
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}
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static void
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ttywrite(unsigned char wb)
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ttywrite(struct ttyfd *tf, unsigned char wb)
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{
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(void)write(STDIN_FILENO, &wb, 1);
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(void)write(tf->fd, &wb, 1);
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}
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static void
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@ -226,10 +236,8 @@ uart_opentty(struct uart_softc *sc)
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{
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struct mevent *mev;
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assert(!sc->opened && sc->stdio);
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ttyopen();
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mev = mevent_add(STDIN_FILENO, EVF_READ, uart_drain, sc);
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ttyopen(&sc->tty);
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mev = mevent_add(sc->tty.fd, EVF_READ, uart_drain, sc);
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assert(mev);
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}
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@ -294,7 +302,7 @@ uart_drain(int fd, enum ev_type ev, void *arg)
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sc = arg;
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assert(fd == STDIN_FILENO);
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assert(fd == sc->tty.fd);
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assert(ev == EVF_READ);
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/*
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@ -305,10 +313,10 @@ uart_drain(int fd, enum ev_type ev, void *arg)
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pthread_mutex_lock(&sc->mtx);
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if ((sc->mcr & MCR_LOOPBACK) != 0) {
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(void) ttyread();
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(void) ttyread(&sc->tty);
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} else {
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while (fifo_available(&sc->rxfifo) &&
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((ch = ttyread()) != -1)) {
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((ch = ttyread(&sc->tty)) != -1)) {
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fifo_putchar(&sc->rxfifo, ch);
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}
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uart_toggle_intr(sc);
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@ -323,12 +331,6 @@ uart_write(struct uart_softc *sc, int offset, uint8_t value)
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int fifosz;
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uint8_t msr;
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/* Open terminal */
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if (!sc->opened && sc->stdio) {
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uart_opentty(sc);
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sc->opened = true;
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}
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pthread_mutex_lock(&sc->mtx);
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/*
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@ -351,8 +353,8 @@ uart_write(struct uart_softc *sc, int offset, uint8_t value)
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if (sc->mcr & MCR_LOOPBACK) {
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if (fifo_putchar(&sc->rxfifo, value) != 0)
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sc->lsr |= LSR_OE;
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} else if (sc->stdio) {
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ttywrite(value);
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} else if (sc->tty.opened) {
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ttywrite(&sc->tty, value);
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} /* else drop on floor */
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sc->thre_int_pending = true;
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break;
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@ -459,12 +461,6 @@ uart_read(struct uart_softc *sc, int offset)
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{
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uint8_t iir, intr_reason, reg;
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/* Open terminal */
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if (!sc->opened && sc->stdio) {
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uart_opentty(sc);
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sc->opened = true;
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}
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pthread_mutex_lock(&sc->mtx);
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/*
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@ -581,19 +577,47 @@ uart_init(uart_intr_func_t intr_assert, uart_intr_func_t intr_deassert,
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return (sc);
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}
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static int
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uart_tty_backend(struct uart_softc *sc, const char *opts)
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{
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int fd;
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int retval;
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retval = -1;
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fd = open(opts, O_RDWR);
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if (fd > 0 && isatty(fd)) {
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sc->tty.fd = fd;
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sc->tty.opened = true;
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retval = 0;
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}
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return (retval);
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}
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int
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uart_set_backend(struct uart_softc *sc, const char *opts)
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{
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/*
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* XXX one stdio backend supported at this time.
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*/
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int retval;
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retval = -1;
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if (opts == NULL)
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return (0);
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if (strcmp("stdio", opts) == 0 && !uart_stdio) {
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sc->stdio = true;
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uart_stdio = true;
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return (0);
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} else
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return (-1);
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if (strcmp("stdio", opts) == 0) {
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if (!uart_stdio) {
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sc->tty.fd = STDIN_FILENO;
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sc->tty.opened = true;
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uart_stdio = true;
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retval = 0;
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}
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} else if (uart_tty_backend(sc, opts) == 0) {
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retval = 0;
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}
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if (retval == 0)
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uart_opentty(sc);
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return (retval);
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}
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@ -39,6 +39,7 @@ guest inside a bhyve virtual machine
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.Op Fl d Ar disk-path
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.Op Fl h Ar host-path
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.Op Fl e Ar name=value
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.Op Fl c Ar cons-dev
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.Ar vmname
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.Sh DESCRIPTION
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.Nm
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@ -100,6 +101,16 @@ to
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.Pp
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The option may be used more than once to set more than one environment
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variable.
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.It Fl c Ar cons-dev
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.Ar cons-dev
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is a
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.Xr tty 4
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device to use for
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.Nm
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terminal I/O.
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.Pp
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The text string "stdio" is also accepted and selects the use of
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unbuffered standard I/O. This is the default value.
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.El
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.Sh EXAMPLES
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To create a virtual machine named
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@ -109,10 +120,23 @@ that boots off the ISO image
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and has 1GB memory allocated to it:
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.Pp
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.Dl "bhyveload -m 1G -d /freebsd/release.iso freebsd-vm"
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.Pp
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To create a virtual machine named
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.Ar test-vm
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with 256MB of memory allocated, the guest root filesystem under the host
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directory
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.Pa /user/images/test
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and terminal I/O sent to the
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.Xr nmdm 4
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device
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.Pa /dev/nmdm1B
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.Pp
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.Dl "bhyveload -m 256MB -h /usr/images/test -c /dev/nmdm1B test-vm
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.Sh SEE ALSO
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.Xr bhyve 4 ,
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.Xr bhyve 8 ,
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.Xr loader 8 ,
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.Xr nmdm 4,
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.Xr vmm 4
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.Sh HISTORY
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.Nm
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@ -91,6 +91,7 @@ __FBSDID("$FreeBSD$");
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static char *host_base = "/";
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static struct termios term, oldterm;
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static int disk_fd = -1;
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static int consin_fd, consout_fd;
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static char *vmname, *progname;
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static struct vmctx *ctx;
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@ -108,7 +109,7 @@ cb_putc(void *arg, int ch)
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{
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char c = ch;
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write(1, &c, 1);
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(void) write(consout_fd, &c, 1);
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}
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static int
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@ -116,7 +117,7 @@ cb_getc(void *arg)
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{
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char c;
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if (read(0, &c, 1) == 1)
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if (read(consin_fd, &c, 1) == 1)
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return (c);
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return (-1);
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}
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@ -126,7 +127,7 @@ cb_poll(void *arg)
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{
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int n;
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if (ioctl(0, FIONREAD, &n) >= 0)
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if (ioctl(consin_fd, FIONREAD, &n) >= 0)
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return (n > 0);
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return (0);
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}
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@ -488,7 +489,7 @@ static void
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cb_exit(void *arg, int v)
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{
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tcsetattr(0, TCSAFLUSH, &oldterm);
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tcsetattr(consout_fd, TCSAFLUSH, &oldterm);
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exit(v);
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}
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@ -564,13 +565,45 @@ static struct loader_callbacks cb = {
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.getenv = cb_getenv,
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};
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static int
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altcons_open(char *path)
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{
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struct stat sb;
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int err;
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int fd;
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/*
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* Allow stdio to be passed in so that the same string
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* can be used for the bhyveload console and bhyve com-port
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* parameters
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*/
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if (!strcmp(path, "stdio"))
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return (0);
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err = stat(path, &sb);
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if (err == 0) {
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if (!S_ISCHR(sb.st_mode))
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err = ENOTSUP;
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else {
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fd = open(path, O_RDWR | O_NONBLOCK);
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if (fd < 0)
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err = errno;
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else
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consin_fd = consout_fd = fd;
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}
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}
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return (err);
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: %s [-m mem-size] [-d <disk-path>] [-h <host-path>]\n"
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" %*s [-e <name=value>] <vmname>\n", progname,
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" %*s [-e <name=value>] [-c <console-device>] <vmname>\n",
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progname,
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(int)strlen(progname), "");
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exit(1);
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}
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@ -589,8 +622,16 @@ main(int argc, char** argv)
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mem_size = 256 * MB;
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disk_image = NULL;
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while ((opt = getopt(argc, argv, "d:e:h:m:")) != -1) {
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consin_fd = STDIN_FILENO;
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consout_fd = STDOUT_FILENO;
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while ((opt = getopt(argc, argv, "c:d:e:h:m:")) != -1) {
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switch (opt) {
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case 'c':
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error = altcons_open(optarg);
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if (error != 0)
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errx(EX_USAGE, "Could not open '%s'", optarg);
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break;
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case 'd':
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disk_image = optarg;
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break;
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@ -640,11 +681,13 @@ main(int argc, char** argv)
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exit(1);
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}
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tcgetattr(0, &term);
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tcgetattr(consout_fd, &term);
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oldterm = term;
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term.c_lflag &= ~(ICANON|ECHO);
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term.c_iflag &= ~ICRNL;
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tcsetattr(0, TCSAFLUSH, &term);
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cfmakeraw(&term);
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term.c_cflag |= CLOCAL;
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tcsetattr(consout_fd, TCSAFLUSH, &term);
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h = dlopen("/boot/userboot.so", RTLD_LOCAL);
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if (!h) {
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printf("%s\n", dlerror());
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