This patch adds 2 new flags: --rootfs [path] - Specifies a path to use as rootfs. The path will be mounted using virtio-9p and booted from. Easiest way to test it is to mount the sample image we recommend with kvm tool (http://wiki.qemu.org/download/linux-0.2.img.bz2) and mounting it somewhere. *PLEASE DO NOT TRY BOOTING FROM YOUR REAL ROOT AKA '/', EVEN WITH READ ONLY SET* - Lets make sure the code is bulletproof before we delete your rootfs :)
--binsh - This flag will boot into simple /bin/sh shell instead of going through /sbin/init. This is usefull for more complex distribution rootfs where we have to deal with /etc/fstab and such. Signed-off-by: Sasha Levin <[email protected]> --- tools/kvm/builtin-run.c | 18 +++++++++++++++++- 1 files changed, 17 insertions(+), 1 deletions(-) diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c index 2e04265..78680ec 100644 --- a/tools/kvm/builtin-run.c +++ b/tools/kvm/builtin-run.c @@ -76,11 +76,13 @@ static const char *guest_mac; static const char *host_mac; static const char *script; static const char *guest_name; +static const char *rootfs; static bool single_step; static bool readonly_image[MAX_DISK_IMAGES]; static bool vnc; static bool sdl; static bool balloon; +static bool bin_sh; extern bool ioport_debug; extern int active_console; extern int debug_iodelay; @@ -156,6 +158,8 @@ static const struct option options[] = { OPT_BOOLEAN('\0', "balloon", &balloon, "Enable virtio balloon"), OPT_BOOLEAN('\0', "vnc", &vnc, "Enable VNC framebuffer"), OPT_BOOLEAN('\0', "sdl", &sdl, "Enable SDL framebuffer"), + OPT_STRING('\0', "rootfs", &rootfs, "path", "Use path as rootfs"), + OPT_BOOLEAN('\0', "binsh", &bin_sh, "Boot rootfs to /bin/sh instead of /sbin/init"), OPT_GROUP("Kernel options:"), OPT_STRING('k', "kernel", &kernel_filename, "kernel", @@ -615,7 +619,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix) strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline)); hi = NULL; - if (!image_filename[0]) { + if (!rootfs && !image_filename[0]) { hi = host_image(real_cmdline, sizeof(real_cmdline)); if (hi) { image_filename[0] = hi; @@ -627,6 +631,18 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix) if (!strstr(real_cmdline, "root=")) strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline)); + if (rootfs) { + char tmp[PATH_MAX]; + + if (realpath(rootfs, tmp) == 0 || + virtio_9p__init(kvm, tmp, "/dev/root") < 0) + die("Unable to initialize virtio 9p"); + strcat(real_cmdline, " root=/dev/root rootflags=rw,trans=virtio,version=9p2000.u rootfstype=9p"); + + if (bin_sh) + strcat(real_cmdline, " init=/bin/sh"); + } + if (image_count) { kvm->nr_disks = image_count; kvm->disks = disk_image__open_all(image_filename, readonly_image, image_count); -- 1.7.6 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
