/** * 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; }
/** * 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) { char root[64] = ""; char *term = getenv ("TERM"); char *ret; bool tcg = flags & APPLIANCE_COMMAND_LINE_IS_TCG; char lpj_s[64] = ""; if (appliance_dev) snprintf (root, sizeof root, " root=%s", appliance_dev); if (tcg) { int lpj = guestfs_int_get_lpj (g); if (lpj > 0) snprintf (lpj_s, sizeof lpj_s, " lpj=%d", lpj); } ret = safe_asprintf (g, "panic=1" /* force kernel to panic if daemon exits */ #ifdef __arm__ " mem=%dM" #endif #ifdef __i386__ " noapic" /* workaround for RHBZ#857026 */ #endif " " SERIAL_CONSOLE /* serial console */ EARLYPRINTK /* get messages from early boot */ #ifdef __aarch64__ " 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. */ " efi-rtc=noprobe" #endif " udevtimeout=6000"/* for slow systems (RHBZ#480319, RHBZ#1096579) */ " udev.event-timeout=6000" /* for newer udevd */ " no_timer_check" /* fix for RHBZ#502058 */ "%s" /* lpj */ " printk.time=1" /* display timestamp before kernel messages */ " cgroup_disable=memory" /* saves us about 5 MB of RAM */ " usbcore.nousb" /* disable USB, only saves about 1ms */ " cryptomgr.notests" /* disable crypto tests, saves 28ms */ " tsc=reliable" /* don't synch TSCs when using SMP, saves 21ms for each secondary vCPU */ " 8250.nr_uarts=1" /* don't scan all 8250 UARTS */ "%s" /* root=appliance_dev */ " %s" /* selinux */ " %s" /* quiet/verbose */ "%s" /* network */ " TERM=%s" /* TERM environment variable */ "%s%s" /* handle identifier */ "%s%s", /* append */ #ifdef __arm__ g->memsize, #endif lpj_s, root, g->selinux ? "selinux=1 enforcing=0" : "selinux=0", g->verbose ? "guestfs_verbose=1" : "quiet", g->enable_network ? " guestfs_network=1" : "", term ? term : "linux", STRNEQ (g->identifier, "") ? " guestfs_identifier=" : "", g->identifier, g->append ? " " : "", g->append ? g->append : ""); return ret; }