On Tue, 2 Aug 2011 21:46:29 +0300, Sasha Levin <levinsasha928@xxxxxxxxx> wrote: > 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 <levinsasha928@xxxxxxxxx> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > --- > 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
