RE: [Xen-devel] [PATCH]fix VMX "xm console" issue

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

>   This patch fixes an issue about VMX "xm console" issue.
> 
>  "xm console" issue is that the serial parameter has not been 
> set, and I add a function to set this parameter. Code is 
> mainly borrowed from Minicom and has been tested both in domU and VMX.

Please expand upon what this issue with the console client is. Why
hasn't the issue been seen with paravirtualized domains?

What behaviour does the tcsetattr alter, and why not just set that
particular bit?

Thanks,
Ian
  
> 
> # HG changeset patch
> # User Ping Yu <ping.y.yu@xxxxxxxxx>
> # Node ID 71111788840f0dd557d7cfc4e919beb511c0237c
> # Parent  8451c65671238604e2678a1f44c2f582ec6ebf96
> Fix an issue for VMX console.
> Add a function to set serial parameter, thus make "xm 
> console" work well
> both in domU and VMX
> 
> Signed-off-by: Ping Yu <ping.y.yu@xxxxxxxxx>
> 
> diff -r 8451c6567123 -r 71111788840f tools/console/client/main.c
> --- a/tools/console/client/main.c       Wed Nov 23 19:37:33 2005
> +++ b/tools/console/client/main.c       Mon Nov 28 15:53:17 2005
> @@ -87,6 +87,92 @@
>       tcsetattr(fd, TCSAFLUSH, &new_term);
>  }
>  
> +/* Code borrowed from Minicom
> + * Set baudrate, parity and number of bits
> + */  
> +static void set_serial_argument(int fd, char *baudr, char *par,
> +             char *bits, char *stopb, int hwf, int swf)
> +{
> +     int spd = -1;
> +     int newbaud;
> +     int bit = bits[0];
> +
> +     struct termios tty;
> +     
> +     tcgetattr(fd, &tty);
> +
> +       /* We generate mark and space parity ourself. */
> +     if (bit == '7' && (par[0] == 'M' || par[0] == 'S'))
> +             bit = '8';
> +
> +      /* Check if 'baudr' is really a number */
> +     if ((newbaud = (atol(baudr) / 100)) == 0 && baudr[0] != '0') 
> +             newbaud = -1;
> +
> +     switch(newbaud) {
> +     case 0:
> +     case 3:         spd = B300;     break;
> +     case 6:         spd = B600;     break;
> +     case 12:        spd = B1200;    break;
> +     case 24:        spd = B2400;    break;
> +     case 48:        spd = B4800;    break;
> +     case 96:        spd = B9600;    break;
> +     case 192:       spd = B19200;   break;
> +     case 384:       spd = B38400;   break;
> +     case 576:       spd = B57600;   break;
> +     case 1152:      spd = B115200;  break;
> +     case 2304:      spd = B230400;  break;
> +     }
> +
> +     if (spd != -1) {
> +             cfsetospeed(&tty, (speed_t)spd);
> +             cfsetispeed(&tty, (speed_t)spd);
> +     }
> +
> +     switch (bit) {
> +     case '5':
> +             tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS5;
> +             break;
> +     case '6':
> +             tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS6;
> +             break;
> +     case '7':
> +             tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS7;
> +             break;
> +     case '8':
> +     default:
> +             tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8;
> +             break;
> +     }
> +
> +       /* Set into raw, no echo mode */
> +     tty.c_iflag =  IGNBRK;
> +     tty.c_lflag = 0;
> +     tty.c_oflag = 0;
> +     tty.c_cflag |= CLOCAL | CREAD;
> +     tty.c_cc[VMIN] = 1;
> +     tty.c_cc[VTIME] = 5;
> +
> +     if (swf)
> +             tty.c_iflag |= IXON | IXOFF;
> +     else
> +             tty.c_iflag &= ~(IXON|IXOFF|IXANY);
> +
> +     tty.c_cflag &= ~(PARENB | PARODD);
> +     if (par[0] == 'E')
> +             tty.c_cflag |= PARENB;
> +     else if (par[0] == 'O')
> +             tty.c_cflag |= (PARENB | PARODD);
> +
> +     if (stopb[0] == '2')
> +             tty.c_cflag |= CSTOPB;
> +     else
> +             tty.c_cflag &= ~CSTOPB;
> +
> +     tcsetattr(fd, TCSANOW, &tty);
> +
> +}
> +
>  static void restore_term(int fd, struct termios *old)
>  {
>       tcsetattr(fd, TCSAFLUSH, old);
> @@ -260,6 +346,7 @@
>       free(path);
>  
>       init_term(STDIN_FILENO, &attr);
> +     set_serial_argument(spty, "115200", "N", "8", "1", 1, 0);
>       console_loop(xc_handle, domid, spty);
>       restore_term(STDIN_FILENO, &attr);
> 
> 
> 
> 
> Sincerely Yours
> 
> Yu Ping
> 
> 
> 

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