mirror of
https://github.com/clearlinux/kvmtool.git
synced 2026-06-16 02:15:47 +00:00
Oleg Nesterov
5614f9d933
Add the tiny x86/init.S which just mounts /host and execs /virt/init. NOTE: of course, the usage of CONFIG_GUEST_PRE_INIT is ugly, we need to cleanup this code. But I'd prefer to do this on top of this minimal/simple change. And I think this needs cleanups in any case, for example I think lkvm shouldn't abuse the "init=" kernel parameter at all. Acked-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
/*
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* This is a simple init for shared rootfs guests. This part should be limited
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* to doing mounts and running stage 2 of the init process.
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*/
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#include <sys/mount.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/reboot.h>
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static int run_process(char *filename)
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{
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char *new_argv[] = { filename, NULL };
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char *new_env[] = { "TERM=linux", "DISPLAY=192.168.33.1:0",
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"HOME=/virt/home", NULL };
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return execve(filename, new_argv, new_env);
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}
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static int run_process_sandbox(char *filename)
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{
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char *new_argv[] = { filename, "/virt/sandbox.sh", NULL };
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char *new_env[] = { "TERM=linux", "HOME=/virt/home", NULL };
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return execve(filename, new_argv, new_env);
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}
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static void do_mounts(void)
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{
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#ifndef CONFIG_GUEST_PRE_INIT
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mount("hostfs", "/host", "9p", MS_RDONLY, "trans=virtio,version=9p2000.L");
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#endif
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mount("", "/sys", "sysfs", 0, NULL);
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mount("proc", "/proc", "proc", 0, NULL);
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mount("devtmpfs", "/dev", "devtmpfs", 0, NULL);
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mkdir("/dev/pts", 0755);
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mount("devpts", "/dev/pts", "devpts", 0, NULL);
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}
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int main(int argc, char *argv[])
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{
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pid_t child;
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int status;
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puts("Mounting...");
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do_mounts();
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/* get session leader */
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setsid();
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/* set controlling terminal */
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ioctl(0, TIOCSCTTY, 1);
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child = fork();
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if (child < 0) {
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printf("Fatal: fork() failed with %d\n", child);
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return 0;
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} else if (child == 0) {
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if (access("/virt/sandbox.sh", R_OK) == 0)
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run_process_sandbox("/bin/sh");
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else
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run_process("/bin/sh");
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} else {
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pid_t corpse;
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do {
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corpse = waitpid(-1, &status, 0);
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} while (corpse != child);
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}
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reboot(RB_AUTOBOOT);
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printf("Init failed: %s\n", strerror(errno));
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return 0;
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}
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