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/* libguestfs
* Copyright (C) 2009-2019 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* The appliance kernel command line.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include "c-ctype.h"
#include "guestfs.h"
#include "guestfs-internal.h"
/**
* Check that the $TERM environment variable is reasonable before
* we pass it through to the appliance.
*/
#define VALID_TERM(term) \
guestfs_int_string_is_valid ((term), 1, 16, \
VALID_FLAG_ALPHA|VALID_FLAG_DIGIT, "-_")
#if defined(__powerpc64__)
#define SERIAL_CONSOLE "console=hvc0 console=ttyS0"
#elif defined(__arm__) || defined(__aarch64__)
#define SERIAL_CONSOLE "console=ttyAMA0"
#elif defined(__s390x__)
#define SERIAL_CONSOLE "console=ttysclp0"
#else
#define SERIAL_CONSOLE "console=ttyS0"
#endif
#if defined(__aarch64__)
#define EARLYPRINTK "earlyprintk=pl011,0x9000000"
#endif
/**
* Construct the Linux command line passed to the appliance. This is
* used by the C<direct> and C<libvirt> backends, and is simply
* located in this file because it's a convenient place for this
* common code.
*
* The C<appliance_dev> parameter must be the full device name of the
* appliance disk and must have already been adjusted to take into
* account virtio-blk or virtio-scsi; eg C</dev/sdb>.
*
* The C<flags> parameter can contain the following flags logically
* or'd together (or 0):
*
* =over 4
*
* =item C<APPLIANCE_COMMAND_LINE_IS_TCG>
*
* If we are launching a qemu TCG guest (ie. KVM is known to be
* disabled or unavailable). If you don't know, don't pass this flag.
*
* =back
*
* Note that this function returns a newly allocated buffer which must
* be freed by the caller.
*/
char *
guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,
int flags)
{
CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (argv);
char *term = getenv ("TERM");
bool tcg = flags & APPLIANCE_COMMAND_LINE_IS_TCG;
char *ret;
/* We assemble the kernel command line by simply joining the final
* list of strings with spaces. This means (a) the strings are not
* quoted (it's not clear if the kernel can handle quoting in any
* case), and (b) we can append multiple parameters in a single
* argument, as we must do for the g->append parameter.
*/
/* Force kernel to panic if daemon exits. */
guestfs_int_add_string (g, &argv, "panic=1");
#ifdef __arm__
guestfs_int_add_sprintf (g, &argv, "mem=%dM", g->memsize);
#endif
#ifdef __i386__
/* Workaround for RHBZ#857026. */
guestfs_int_add_string (g, &argv, "noapic");
#endif
/* Serial console. */
guestfs_int_add_string (g, &argv, SERIAL_CONSOLE);
#ifdef EARLYPRINTK
/* Get messages from early boot. */
guestfs_int_add_string (g, &argv, EARLYPRINTK);
#endif
#ifdef __aarch64__
guestfs_int_add_string (g, &argv, "ignore_loglevel");
/* This option turns off the EFI RTC device. QEMU VMs don't
* currently provide EFI, and if the device is compiled in it
* will try to call the EFI function GetTime unconditionally
* (causing a call to NULL). However this option requires a
* non-upstream patch.
*/
guestfs_int_add_string (g, &argv, "efi-rtc=noprobe");
#endif
/* RHBZ#1404287 */
guestfs_int_add_string (g, &argv, "edd=off");
/* For slow systems (RHBZ#480319, RHBZ#1096579). */
guestfs_int_add_string (g, &argv, "udevtimeout=6000");
/* Same as above, for newer udevd. */
guestfs_int_add_string (g, &argv, "udev.event-timeout=6000");
/* Fix for RHBZ#502058. */
guestfs_int_add_string (g, &argv, "no_timer_check");
if (tcg) {
const int lpj = guestfs_int_get_lpj (g);
if (lpj > 0)
guestfs_int_add_sprintf (g, &argv, "lpj=%d", lpj);
}
/* Display timestamp before kernel messages. */
guestfs_int_add_string (g, &argv, "printk.time=1");
/* Saves us about 5 MB of RAM. */
guestfs_int_add_string (g, &argv, "cgroup_disable=memory");
/* Disable USB, only saves about 1ms. */
guestfs_int_add_string (g, &argv, "usbcore.nousb");
/* Disable crypto tests, saves 28ms. */
guestfs_int_add_string (g, &argv, "cryptomgr.notests");
/* Don't synch TSCs when using SMP. Saves 21ms for each secondary vCPU. */
guestfs_int_add_string (g, &argv, "tsc=reliable");
/* Don't scan all 8250 UARTS. */
guestfs_int_add_string (g, &argv, "8250.nr_uarts=1");
/* Tell supermin about the appliance device. */
if (appliance_dev)
guestfs_int_add_sprintf (g, &argv, "root=%s", appliance_dev);
/* SELinux - deprecated setting, never worked and should not be enabled. */
if (g->selinux)
guestfs_int_add_string (g, &argv, "selinux=1 enforcing=0");
else
guestfs_int_add_string (g, &argv, "selinux=0");
/* Quiet/verbose. */
if (g->verbose)
guestfs_int_add_string (g, &argv, "guestfs_verbose=1");
else
guestfs_int_add_string (g, &argv, "quiet");
/* Network. */
if (g->enable_network)
guestfs_int_add_string (g, &argv, "guestfs_network=1");
/* TERM environment variable. */
if (term && VALID_TERM (term))
guestfs_int_add_sprintf (g, &argv, "TERM=%s", term);
else
guestfs_int_add_string (g, &argv, "TERM=linux");
/* Handle identifier. */
if (STRNEQ (g->identifier, ""))
guestfs_int_add_sprintf (g, &argv, "guestfs_identifier=%s", g->identifier);
/* Append extra arguments. */
if (g->append)
guestfs_int_add_string (g, &argv, g->append);
guestfs_int_end_stringsbuf (g, &argv);
/* Caller frees. */
ret = guestfs_int_join_strings (" ", argv.argv);
if (ret == NULL)
g->abort_cb ();
return ret;
}
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