On 07/14/16 at 05:51pm, Baoquan He wrote:
> On 07/14/16 at 04:45pm, Lee, Chun-Yi wrote:
> > This patch adds a new "--fallback-kexec" option to give a chance to
> > fallback to old kexec syscall when file based kexec syscall operation
> > failed.
> >
> > This option works with --kexec-file-syscall to provide more flexible
> > way to adapt to different kernels that those kernels built with
> > different kexec syscall config or have different verification policy.
>
> Usually distribuition system uses script to build a framework to
~ I mean distro here.
> connect the kexec/kdump, makedumpfile utility chain. This can make user
> execute a very simple script command to implement kexec load or kexec
> jumping job. In this case script can do what you are trying to do.
>
> Besides, have you actually met that kexec-file failed but old kexec
> syscall works? I mean how did you test it? I am wondering when it will
> happen.
>
> Thanks
> Baoquan
>
> >
> > Cc: Simon Horman <[email protected]>
> > Cc: Petr Tesarik <[email protected]>
> > Cc: Vivek Goyal <[email protected]>
> > Signed-off-by: Lee, Chun-Yi <[email protected]>
> > ---
> > kexec/kexec.c | 13 +++++++++++++
> > kexec/kexec.h | 4 +++-
> > 2 files changed, 16 insertions(+), 1 deletion(-)
> >
> > diff --git a/kexec/kexec.c b/kexec/kexec.c
> > index 500e5a9..e05b43f 100644
> > --- a/kexec/kexec.c
> > +++ b/kexec/kexec.c
> > @@ -969,6 +969,7 @@ void usage(void)
> > " preserve context)\n"
> > " to original kernel.\n"
> > " -s, --kexec-file-syscall Use file based syscall for kexec
> > operation\n"
> > + " --fallback-kexec Fallback to old kexec when file based
> > syscall failed\n"
> > " -d, --debug Enable debugging to help spot a
> > failure.\n"
> > "\n"
> > "Supported kernel file types and options: \n");
> > @@ -1204,6 +1205,7 @@ int main(int argc, char *argv[])
> > int do_unload = 0;
> > int do_reuse_initrd = 0;
> > int do_kexec_file_syscall = 0;
> > + int do_fallback_kexec_syscall = 0;
> > void *entry = 0;
> > char *type = 0;
> > char *endptr;
> > @@ -1226,9 +1228,13 @@ int main(int argc, char *argv[])
> > case OPT_KEXEC_FILE_SYSCALL:
> > do_kexec_file_syscall = 1;
> > break;
> > + case OPT_FALLBACK_KEXEC:
> > + do_fallback_kexec_syscall = 1;
> > + break;
> > }
> > }
> >
> > +fallback:
> > /* Reset getopt for the next pass. */
> > opterr = 1;
> > optind = 1;
> > @@ -1407,6 +1413,13 @@ int main(int argc, char *argv[])
> > result = my_load(type, fileind, argc, argv,
> > kexec_flags, entry);
> > }
> > + /* fallback to old kexec syscall */
> > + if (do_kexec_file_syscall && result != 0 && do_fallback_kexec_syscall) {
> > + fprintf(stderr, "Fallback to kexec syscall\n");
> > + do_kexec_file_syscall = 0;
> > + do_fallback_kexec_syscall = 0;
> > + goto fallback;
> > + }
> > /* Don't shutdown unless there is something to reboot to! */
> > if ((result == 0) && (do_shutdown || do_exec) && !kexec_loaded()) {
> > die("Nothing has been loaded!\n");
> > diff --git a/kexec/kexec.h b/kexec/kexec.h
> > index 9194f1c..65dbd56 100644
> > --- a/kexec/kexec.h
> > +++ b/kexec/kexec.h
> > @@ -225,7 +225,8 @@ extern int file_types;
> > #define OPT_LOAD_PRESERVE_CONTEXT 259
> > #define OPT_LOAD_JUMP_BACK_HELPER 260
> > #define OPT_ENTRY 261
> > -#define OPT_MAX 262
> > +#define OPT_FALLBACK_KEXEC 262
> > +#define OPT_MAX 263
> > #define KEXEC_OPTIONS \
> > { "help", 0, 0, OPT_HELP }, \
> > { "version", 0, 0, OPT_VERSION }, \
> > @@ -244,6 +245,7 @@ extern int file_types;
> > { "mem-max", 1, 0, OPT_MEM_MAX }, \
> > { "reuseinitrd", 0, 0, OPT_REUSE_INITRD }, \
> > { "kexec-file-syscall", 0, 0, OPT_KEXEC_FILE_SYSCALL }, \
> > + { "fallback-kexec", 0, 0, OPT_FALLBACK_KEXEC }, \
> > { "debug", 0, 0, OPT_DEBUG }, \
> >
> > #define KEXEC_OPT_STR "h?vdfxyluet:ps"
> > --
> > 2.6.6
> >
> >
> > _______________________________________________
> > kexec mailing list
> > [email protected]
> > http://lists.infradead.org/mailman/listinfo/kexec
>
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