[PATCH 2/2] efi_loader: Reset system after CapsuleUpdate on disk

[Masami Hiramatsu]

Hi Grant,

2022年1月31日(月) 20:20 Grant Likely <grant.likely at arm.com>:
>
> On 31/01/2022 09:19, Masami Hiramatsu wrote:
> > Add a config option to reset system soon after processing capsule update
> > on disk. This is required in UEFI specification 2.9 Section 8.5.5
> >   "Delivery of Capsules via file on Mass Storage device" as;
> >
> >      In all cases that a capsule is identified for processing the system is
> >      restarted after capsule processing is completed.
> >
> > Signed-off-by: Masami Hiramatsu <masami.hiramatsu at linaro.org>
>
> Is there known use cases for making this an option? Feels a bit like
> option creep that is too easy to choose the wrong setting.

No, I just guessed that it may be helpful for porting FWU, because
we can check whether the metadata is updated correctly before reboot.
(anyway, while developing we can just comment out the code too.)

Thank you,

>
> Otherwise, this looks good to me.
>
> g.
>
> > ---
> >   lib/efi_loader/Kconfig       |   10 ++++++++++
> >   lib/efi_loader/efi_capsule.c |    9 +++++++++
> >   2 files changed, 19 insertions(+)
> >
> > diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
> > index 24f9a2bb75..db05c3ad90 100644
> > --- a/lib/efi_loader/Kconfig
> > +++ b/lib/efi_loader/Kconfig
> > @@ -146,6 +146,16 @@ config EFI_IGNORE_OSINDICATIONS
> >         without setting the EFI_OS_INDICATIONS_FILE_CAPSULE_DELIVERY_SUPPORTED
> >         flag in variable OsIndications.
> >
> > +config EFI_RESET_AFTER_CAPSULE_ON_DISK
> > +     bool "Reset right after CapsuleUpdate on-disk"
> > +     depends on EFI_CAPSULE_ON_DISK
> > +     default y
> > +     help
> > +       UEFI specification requests the system to be restarted after capsule
> > +       processing is complete. This implements that, but for some reason,
> > +       if you want to keep the (old) system running after the capsule update
> > +       on-disk, you can say 'n' here.
> > +
> >   config EFI_CAPSULE_ON_DISK_EARLY
> >       bool "Initiate capsule-on-disk at U-Boot boottime"
> >       depends on EFI_CAPSULE_ON_DISK
> > diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
> > index 98dab1c6f5..44d4fa2f82 100644
> > --- a/lib/efi_loader/efi_capsule.c
> > +++ b/lib/efi_loader/efi_capsule.c
> > @@ -1142,6 +1142,15 @@ efi_status_t efi_launch_capsules(void)
> >               free(files[i]);
> >       free(files);
> >
> > +     /*
> > +      * UEFI spec requires to reset system after complete processing capsule
> > +      * update on the storage.
> > +      */
> > +     if (IS_ENABLED(CONFIG_EFI_RESET_AFTER_CAPSULE_ON_DISK)) {
> > +             log_info("Restarting the system to boot the updated firmware.\n");
> > +             do_reset(NULL, 0, 0, NULL);
> > +     }
> > +
> >       if (IS_ENABLED(CONFIG_EFI_ESRT)) {
> >               /* Rebuild the ESRT to reflect any updated FW images. */
> >               ret = efi_esrt_populate();
> >
>
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-- 
Masami Hiramatsu