Adds a generic --reuseinitrd option and performs some sanity checks on
it. Can be used with the retain_initrd kernel option.
Signed-off-by: Michael Neuling <mikey at neuling.org>
---
This series reserves the memory region so kexec doesn't
attempt to use it for something else. Noticed by Milton.
---
kexec/kexec.c | 33 +++++++++++++++++++++++++++++++++
kexec/kexec.h | 2 ++
2 files changed, 35 insertions(+)
Index: kexec-tools-testing/kexec/kexec.c
===================================================================
--- kexec-tools-testing.orig/kexec/kexec.c
+++ kexec-tools-testing/kexec/kexec.c
@@ -748,6 +748,7 @@ void usage(void)
" load code into.\n"
" --mem-max=<addr> Specify the highest memory address to\n"
" load code into.\n"
+ " --reuseinird Reuse initrd from first boot.\n"
"\n"
"Supported kernel file types and options: \n");
for (i = 0; i < file_types; i++) {
@@ -772,6 +773,29 @@ static int kexec_loaded(void)
return ret;
}
+/* check we retained the initrd */
+void check_reuse_initrd(void)
+{
+ FILE * fp;
+ char * line = NULL;
+ size_t len = 0;
+ ssize_t read;
+
+ fp = fopen("/proc/cmdline", "r");
+ if (fp == NULL)
+ die("unable to open /proc/cmdline\n");
+ read = getline(&line, &len, fp);
+ if (strstr(line, "retain_initrd") == NULL)
+ die("unrecoverable error: current boot didn't "
+ "retain the initrd for reuse.\n");
+}
+
+/* Arch hook for reuse_initrd */
+void __attribute__((weak)) arch_reuse_initrd(void)
+{
+ die("--reuseinitrd not implemented on this architecture\n");
+}
+
int main(int argc, char *argv[])
{
int do_load = 1;
@@ -780,6 +804,7 @@ int main(int argc, char *argv[])
int do_sync = 1;
int do_ifdown = 0;
int do_unload = 0;
+ int do_reuse_initrd = 0;
unsigned long kexec_flags = 0;
char *type = 0;
char *endptr;
@@ -860,6 +885,9 @@ int main(int argc, char *argv[])
return 1;
}
break;
+ case OPT_REUSE_INITRD:
+ do_reuse_initrd = 1;
+ break;
default:
break;
}
@@ -890,6 +918,11 @@ int main(int argc, char *argv[])
}
}
+ if (do_reuse_initrd){
+ check_reuse_initrd();
+ arch_reuse_initrd();
+ }
+
if (do_unload) {
result = k_unload(kexec_flags);
}
Index: kexec-tools-testing/kexec/kexec.h
===================================================================
--- kexec-tools-testing.orig/kexec/kexec.h
+++ kexec-tools-testing/kexec/kexec.h
@@ -163,6 +163,7 @@ extern int file_types;
#define OPT_MEM_MIN 256
#define OPT_MEM_MAX 257
#define OPT_MAX 258
+#define OPT_REUSE_INITRD 259
#define KEXEC_OPTIONS \
{ "help", 0, 0, OPT_HELP }, \
{ "version", 0, 0, OPT_VERSION }, \
@@ -175,6 +176,7 @@ extern int file_types;
{ "load-panic", 0, 0, OPT_PANIC }, \
{ "mem-min", 1, 0, OPT_MEM_MIN }, \
{ "mem-max", 1, 0, OPT_MEM_MAX }, \
+ { "reuseinitrd", 0, 0, OPT_REUSE_INITRD }, \
#define KEXEC_OPT_STR "hvdfxluet:p"
