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    Subject[3/7] Xen VMM #3: runtime disable of VT console
    Date
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    This patch enables the VT console to be disabled at runtime even if it
    is built into the kernel. Arch xen needs this to avoid trying to
    initialise a VT in virtual machine that doesn't have access to the
    console hardware.

    Signed-off-by: ian.pratt@cl.cam.ac.uk

    ---


    diff -Nurp pristine-linux-2.6.10-rc2/drivers/char/tty_io.c tmp-linux-2.6.10-rc2-xen.patch/drivers/char/tty_io.c
    --- pristine-linux-2.6.10-rc2/drivers/char/tty_io.c 2004-11-30 01:19:44.000000000 +0000
    +++ tmp-linux-2.6.10-rc2-xen.patch/drivers/char/tty_io.c 2004-11-30 00:41:24.000000000 +0000
    @@ -131,6 +131,8 @@ LIST_HEAD(tty_drivers); /* linked list
    vt.c for deeply disgusting hack reasons */
    DECLARE_MUTEX(tty_sem);

    +int console_use_vt = 1;
    +
    #ifdef CONFIG_UNIX98_PTYS
    extern struct tty_driver *ptm_driver; /* Unix98 pty masters; for /dev/ptmx */
    extern int pty_limit; /* Config limit on Unix98 ptys */
    @@ -2964,14 +2966,19 @@ static int __init tty_init(void)
    #endif

    #ifdef CONFIG_VT
    - cdev_init(&vc0_cdev, &console_fops);
    - if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
    - register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
    - panic("Couldn't register /dev/tty0 driver\n");
    - devfs_mk_cdev(MKDEV(TTY_MAJOR, 0), S_IFCHR|S_IRUSR|S_IWUSR, "vc/0");
    - class_simple_device_add(tty_class, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
    + if (console_use_vt) {
    + cdev_init(&vc0_cdev, &console_fops);
    + if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
    + register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1,
    + "/dev/vc/0") < 0)
    + panic("Couldn't register /dev/tty0 driver\n");
    + devfs_mk_cdev(MKDEV(TTY_MAJOR, 0), S_IFCHR|S_IRUSR|S_IWUSR,
    + "vc/0");
    + class_simple_device_add(tty_class, MKDEV(TTY_MAJOR, 0), NULL,
    + "tty0");

    - vty_init();
    + vty_init();
    + }
    #endif
    return 0;
    }
    -
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