Re: [qemu-s390x] [PATCH v2] s390/ipl: fix ipl with -no-reboot

[Christian Borntraeger]

On 06/21/2018 06:35 PM, Christian Borntraeger wrote:
> kexec/kdump as well as the bootloader use a subcode of diagnose 308
> that is supposed to reset the subsystem but not comprise a full
> "reboot". With the latest refactoring this is now broken when
> -no-reboot is used. This for example break virt-install from
> iso images.

Its even worse. With this patch I can IPL with --no-reboot, but
virt-install still creates an xml like

  <on_poweroff>destroy</on_poweroff>
  <on_reboot>destroy</on_reboot>
  <on_crash>destroy</on_crash>

With you patch a "soft reset" still seems to trigger an qapi event
so that libvirt kills the guest due to that...

> 
> We need to mark these "soft" reboots as ok for rebooting.
> 
> Fixes: a30fb811cbe9 (s390x: refactor reset/reipl handling)
> Signed-off-by: Christian Borntraeger <address@hidden>
> ---
>  hw/s390x/ipl.c          | 8 +++++++-
>  include/sysemu/sysemu.h | 3 +++
>  vl.c                    | 2 +-
>  3 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> index 0d67349004..ade6896af6 100644
> --- a/hw/s390x/ipl.c
> +++ b/hw/s390x/ipl.c
> @@ -535,7 +535,13 @@ void s390_ipl_reset_request(CPUState *cs, enum 
> s390_reset reset_type)
>              ipl->iplb_valid = s390_gen_initial_iplb(ipl);
>          }
>      }
> -    qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
> +    if (reset_type == S390_RESET_MODIFIED_CLEAR ||
> +        reset_type == S390_RESET_LOAD_NORMAL) {
> +        /* ignore -no-reboot */
> +        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET_FORCE);
> +    } else {
> +        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
> +    }
>      /* as this is triggered by a CPU, make sure to exit the loop */
>      if (tcg_enabled()) {
>          cpu_loop_exit(cs);
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index e893f72f3b..345369d924 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -44,6 +44,9 @@ typedef enum ShutdownCause {
>                                       turns that into a shutdown */
>      SHUTDOWN_CAUSE_GUEST_PANIC,   /* Guest panicked, and command line turns
>                                       that into a shutdown */
> +    SHUTDOWN_CAUSE_GUEST_RESET_FORCE,/* Guest reset that should ignore
> +                                        --no-reboot. This is useful for reset
> +                                        like actions as s390 kexec/kdump */
>      SHUTDOWN_CAUSE__MAX,
>  } ShutdownCause;
>  
> diff --git a/vl.c b/vl.c
> index b3426e03d0..722c3b9963 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1674,7 +1674,7 @@ void qemu_system_guest_panicked(GuestPanicInformation 
> *info)
>  
>  void qemu_system_reset_request(ShutdownCause reason)
>  {
> -    if (no_reboot) {
> +    if (no_reboot && reason != SHUTDOWN_CAUSE_GUEST_RESET_FORCE) {
>          shutdown_requested = reason;
>      } else {
>          reset_requested = reason;
>