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kvm tools: Embed init and init_stage2 into lkvm binary

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We generate guest init and init_stage2 on the fly and put them in

   ~/.lkvm/$guest/virt/init
   ~/.lkvm/$guest/virt/init_stage2
.

This makes 'lkvm run' no longer depending on guest/{int, init_stage2}.

Further, we can merge init and init_stage2 since there is no need to
split the init function into two stages any more.

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Asias He
2012-08-22 20:48:14 +08:00
committed by Will Deacon
parent a67da3beff
commit afc2c7c0ba
2 changed files with 43 additions and 18 deletions
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Makefile
+8 -5
View File
@@ -286,14 +286,15 @@ KVMTOOLS-VERSION-FILE:
# $(OTHEROBJS) are things that do not get substituted like this.
#
STATIC_OBJS = $(patsubst %.o,%.static.o,$(OBJS) $(OBJS_STATOPT))
GUEST_OBJS = guest/guest_init.o guest/guest_init_stage2.o
$(PROGRAM)-static: $(DEPS) $(STATIC_OBJS) $(OTHEROBJS)
$(PROGRAM)-static: $(DEPS) $(STATIC_OBJS) $(OTHEROBJS) $(GUEST_INIT) $(GUEST_INIT_S2)
$(E) " LINK " $@
$(Q) $(CC) -static $(CFLAGS) $(STATIC_OBJS) $(OTHEROBJS) $(LIBS) $(LIBS_STATOPT) -o $@
$(Q) $(CC) -static $(CFLAGS) $(STATIC_OBJS) $(OTHEROBJS) $(GUEST_OBJS) $(LIBS) $(LIBS_STATOPT) -o $@
$(PROGRAM): $(DEPS) $(OBJS) $(OBJS_DYNOPT) $(OTHEROBJS)
$(PROGRAM): $(DEPS) $(OBJS) $(OBJS_DYNOPT) $(OTHEROBJS) $(GUEST_INIT) $(GUEST_INIT_S2)
$(E) " LINK " $@
$(Q) $(CC) $(CFLAGS) $(OBJS) $(OBJS_DYNOPT) $(OTHEROBJS) $(LIBS) $(LIBS_DYNOPT) -o $@
$(Q) $(CC) $(CFLAGS) $(OBJS) $(OBJS_DYNOPT) $(OTHEROBJS) $(GUEST_OBJS) $(LIBS) $(LIBS_DYNOPT) -o $@
$(PROGRAM_ALIAS): $(PROGRAM)
$(E) " LN " $@
@@ -302,10 +303,12 @@ $(PROGRAM_ALIAS): $(PROGRAM)
$(GUEST_INIT): guest/init.c
$(E) " LINK " $@
$(Q) $(CC) -static guest/init.c -o $@
$(Q) ld -r -b binary -o guest/guest_init.o $(GUEST_INIT)
$(GUEST_INIT_S2): guest/init_stage2.c
$(E) " LINK " $@
$(Q) $(CC) -static guest/init_stage2.c -o $@
$(Q) ld -r -b binary -o guest/guest_init_stage2.o $(GUEST_INIT_S2)
$(DEPS):
@@ -403,7 +406,7 @@ clean:
$(Q) rm -f x86/bios/bios-rom.h
$(Q) rm -f tests/boot/boot_test.iso
$(Q) rm -rf tests/boot/rootfs/
$(Q) rm -f $(DEPS) $(OBJS) $(OTHEROBJS) $(OBJS_DYNOPT) $(STATIC_OBJS) $(PROGRAM) $(PROGRAM_ALIAS) $(PROGRAM)-static $(GUEST_INIT) $(GUEST_INIT_S2)
$(Q) rm -f $(DEPS) $(OBJS) $(OTHEROBJS) $(OBJS_DYNOPT) $(STATIC_OBJS) $(PROGRAM) $(PROGRAM_ALIAS) $(PROGRAM)-static $(GUEST_INIT) $(GUEST_INIT_S2) $(GUEST_OBJS)
$(Q) rm -f cscope.*
$(Q) rm -f tags
$(Q) rm -f TAGS
builtin-run.c
+35 -13
View File
@@ -111,6 +111,11 @@ bool do_debug_print = false;
static int nrcpus;
static int vidmode = -1;
extern char _binary_guest_init_stage2_start;
extern char _binary_guest_init_stage2_size;
extern char _binary_guest_init_start;
extern char _binary_guest_init_size;
static const char * const run_usage[] = {
"lkvm run [<options>] [<kernel image>]",
NULL
@@ -803,24 +808,41 @@ void kvm_run_help(void)
usage_with_options(run_usage, options);
}
static int kvm_custom_stage2(void)
static int kvm_setup_guest_init(void)
{
char tmp[PATH_MAX], dst[PATH_MAX], *src;
const char *rootfs = custom_rootfs_name;
int r;
char tmp[PATH_MAX];
size_t size;
int fd, ret;
char *data;
src = realpath("guest/init_stage2", NULL);
if (src == NULL)
return -ENOMEM;
/* Setup /virt/init */
size = (size_t)&_binary_guest_init_size;
data = (char *)&_binary_guest_init_start;
snprintf(tmp, PATH_MAX, "%s%s/virt/init", kvm__get_dir(), rootfs);
remove(tmp);
fd = open(tmp, O_CREAT | O_WRONLY, 0755);
if (fd < 0)
die("Fail to setup %s", tmp);
ret = xwrite(fd, data, size);
if (ret < 0)
die("Fail to setup %s", tmp);
close(fd);
/* Setup /virt/init_stage2 */
size = (size_t)&_binary_guest_init_stage2_size;
data = (char *)&_binary_guest_init_stage2_start;
snprintf(tmp, PATH_MAX, "%s%s/virt/init_stage2", kvm__get_dir(), rootfs);
remove(tmp);
fd = open(tmp, O_CREAT | O_WRONLY, 0755);
if (fd < 0)
die("Fail to setup %s", tmp);
ret = xwrite(fd, data, size);
if (ret < 0)
die("Fail to setup %s", tmp);
close(fd);
snprintf(dst, PATH_MAX, "/host/%s", src);
r = symlink(dst, tmp);
free(src);
return r;
return 0;
}
static int kvm_run_set_sandbox(void)
@@ -1147,8 +1169,8 @@ static int kvm_cmd_run_init(int argc, const char **argv)
if (!no_dhcp)
strcat(real_cmdline, " ip=dhcp");
if (kvm_custom_stage2())
die("Failed linking stage 2 of init.");
if (kvm_setup_guest_init())
die("Failed to setup init for guest.");
}
} else if (!strstr(real_cmdline, "root=")) {
strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline));