Re: [Qemu-devel] [PATCH v3 1/5] ppc: spapr: Register and handle HCALL to receive updated RTAS region

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Aug 16, 2017 at 02:42:13PM +0530, Aravinda Prasad wrote:
> Receive updates from SLOF about the updated rtas-base.
> A separate patch for SLOF [1] adds functionality to invoke
> a private HCALL whenever OS issues instantiate-rtas with
> a new rtas-base.
> 
> This is required as QEMU needs to know the updated rtas-base
> as it allocates error reporting structure in RTAS space upon
> a machine check exception.
> 
> [1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-August/120386.html
> 
> Signed-off-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

Actually, I take back this R-b, see below.

In any case I'm not willing to apply the patches which depend on this
until the corresponding SLOF update is merged as well.

> ---
>  hw/ppc/spapr_hcall.c   |    8 ++++++++
>  include/hw/ppc/spapr.h |    4 +++-
>  2 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index 72ea5a8..e66c72e 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1062,6 +1062,13 @@ static target_ulong h_rtas(PowerPCCPU *cpu, sPAPRMachineState *spapr,
>                             nret, rtas_r3 + 12 + 4*nargs);
>  }
>  
> +static target_ulong h_rtas_update(PowerPCCPU *cpu, sPAPRMachineState *spapr,
> +                                  target_ulong opcode, target_ulong *args)
> +{
> +    spapr->rtas_addr = args[0];
> +    return 0;
> +}
> +
>  static target_ulong h_logical_load(PowerPCCPU *cpu, sPAPRMachineState *spapr,
>                                     target_ulong opcode, target_ulong *args)
>  {
> @@ -1717,6 +1724,7 @@ static void hypercall_register_types(void)
>  
>      /* qemu/KVM-PPC specific hcalls */
>      spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
> +    spapr_register_hypercall(KVMPPC_H_RTAS_UPDATE, h_rtas_update);
>  
>      /* ibm,client-architecture-support support */
>      spapr_register_hypercall(KVMPPC_H_CAS, h_client_architecture_support);
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 2a303a7..46012b3 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -90,6 +90,7 @@ struct sPAPRMachineState {
>  
>      hwaddr rma_size;
>      int vrma_adjust;
> +    hwaddr rtas_addr;

This can now change at runtime, which means it needs to be migrated -
that's not happening in your patches yet.

>      ssize_t rtas_size;
>      void *rtas_blob;
>      long kernel_size;
> @@ -399,7 +400,8 @@ struct sPAPRMachineState {
>  #define KVMPPC_H_LOGICAL_MEMOP  (KVMPPC_HCALL_BASE + 0x1)
>  /* Client Architecture support */
>  #define KVMPPC_H_CAS            (KVMPPC_HCALL_BASE + 0x2)
> -#define KVMPPC_HCALL_MAX        KVMPPC_H_CAS
> +#define KVMPPC_H_RTAS_UPDATE    (KVMPPC_HCALL_BASE + 0x3)
> +#define KVMPPC_HCALL_MAX        KVMPPC_H_RTAS_UPDATE
>  
>  typedef struct sPAPRDeviceTreeUpdateHeader {
>      uint32_t version_id;
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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