Re: [Qemu-devel] [PATCH 1/3 v3] ppc: spapr-rtas - implement os-term rtas call

[Alexey Kardashevskiy <aik@au1.ibm.com>]

On 06/27/2014 04:47 PM, Nikunj A Dadhania wrote:
> PAPR compliant guest calls this in absence of kdump. This finally
> reaches the guest and can be handled according to the policies set by
> higher level tools(like taking dump) for further analysis by tools like
> crash.
> 
> Linux kernel calls this only when the extended version of os,term is
> implemented to make sure that a return to the linux kernel is gauranteed.
> 
> CC: Benjamin Herrenschmidt <benh@au1.ibm.com>
> CC: Anton Blanchard <anton@samba.org>
> CC: Alexander Graf <agraf@suse.de>
> Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
> 
> ---
> 
> v2: rebase to ppcnext
> v3: Do not stop the VM, and update comments
> ---
>  hw/ppc/spapr_rtas.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
> index 9ba1ba6..2da33c8 100644
> --- a/hw/ppc/spapr_rtas.c
> +++ b/hw/ppc/spapr_rtas.c
> @@ -29,6 +29,8 @@
>  #include "sysemu/char.h"
>  #include "hw/qdev.h"
>  #include "sysemu/device_tree.h"
> +#include "qapi/qmp/qjson.h"
> +#include "monitor/monitor.h"
>  
>  #include "hw/ppc/spapr.h"
>  #include "hw/ppc/spapr_vio.h"
> @@ -277,6 +279,41 @@ static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
>      rtas_st(rets, 0, ret);
>  }
>  
> +static void rtas_ibm_os_term(PowerPCCPU *cpu,
> +                            sPAPREnvironment *spapr,
> +                            uint32_t token, uint32_t nargs,
> +                            target_ulong args,
> +                            uint32_t nret, target_ulong rets)
> +{
> +    target_ulong ret = 0;
> +    QObject *data;
> +
> +    data = qobject_from_jsonf("{ 'action': %s }", "pause");
> +    monitor_protocol_event(QEVENT_GUEST_PANICKED, data);
> +    qobject_decref(data);
> +
> +    rtas_st(rets, 0, ret);
> +}
> +
> +/*
> + * According to PAPR, rtas ibm,os-term, does not gaurantee a return
> + * back to the guest cpu.
> + *
> + * While an additional ibm,extended-os-term property indicates that
> + * rtas call return will always occur. Below function implements a
> + * place holder for the same.
> + */
> +static void rtas_ibm_ext_os_term(PowerPCCPU *cpu,
> +                            sPAPREnvironment *spapr,
> +                            uint32_t token, uint32_t nargs,
> +                            target_ulong args,
> +                            uint32_t nret, target_ulong rets)
> +{
> +    target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
> +
> +    rtas_st(rets, 0, ret);
> +}
> +
>  static struct rtas_call {
>      const char *name;
>      spapr_rtas_fn fn;
> @@ -404,6 +441,10 @@ static void core_rtas_register_types(void)
>      spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
>                          "ibm,set-system-parameter",
>                          rtas_ibm_set_system_parameter);
> +    spapr_rtas_register("ibm,os-term",
> +                        rtas_ibm_os_term);


This just won't compile, spapr_rtas_register() takes 3 parameters now.
Tokens for "ibm,os-term" and "ibm,extended-os-term" are already defined,
just use them.



> +    spapr_rtas_register("ibm,extended-os-term",
> +                        rtas_ibm_ext_os_term);
>  }
>  
>  type_init(core_rtas_register_types)
> 


ps. please (please) do not use my ibm's email in public :)

-- 
Alexey Kardashevskiy
IBM OzLabs, LTC Team

e-mail: aik@au1.ibm.com
notes: Alexey Kardashevskiy/Australia/IBM