Re: [Qemu-ppc] [PATCH v3 08/12] target/ppc: Add new H-CALL shells for in memory table translation

[David Gibson]

On Fri, Mar 03, 2017 at 01:16:05PM +1100, Alexey Kardashevskiy wrote:
> On 02/03/17 16:39, Sam Bobroff wrote:
> > From: Suraj Jitindar Singh <address@hidden>
> > 
> > The use of the new in memory tables introduced in ISAv3.00 for translation,
> > also referred to as process tables, requires the introduction of 3 new
> > H-CALLs; H_REGISTER_PROCESS_TABLE, H_CLEAN_SLB, and H_INVALIDATE_PID.
> > 
> > Add shells for each of these and register them as the hypercall handlers.
> > Currently they all log an unimplemented hypercall and return H_FUNCTION.
> 
> 
> How exactly is this more useful than just not having these hypercalls
> defined at all?

In terms of actual functionality, it's not.  But I'm ok with putting
stubs in then expanding on them - makes the patches a little easier to
follow.

> > Signed-off-by: Suraj Jitindar Singh <address@hidden>
> > ---
> > Changes in v3:
> > * Brought in from Suraj's work.
> > 
> >  hw/ppc/spapr_hcall.c   | 31 +++++++++++++++++++++++++++++++
> >  include/hw/ppc/spapr.h |  3 +++
> >  2 files changed, 34 insertions(+)
> > 
> > diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> > index 0c1b0326ad..cd0d8b068c 100644
> > --- a/hw/ppc/spapr_hcall.c
> > +++ b/hw/ppc/spapr_hcall.c
> > @@ -878,6 +878,32 @@ static target_ulong h_set_mode(PowerPCCPU *cpu, 
> > sPAPRMachineState *spapr,
> >      return ret;
> >  }
> >  
> > +static target_ulong h_clean_slb(PowerPCCPU *cpu, sPAPRMachineState *spapr,
> > +                                target_ulong opcode, target_ulong *args)
> > +{
> > +    qemu_log_mask(LOG_UNIMP, "Unimplemented SPAPR hcall 0x" TARGET_FMT_lx 
> > "%s\n",
> > +                  opcode, " (H_CLEAN_SLB)");
> > +    return H_FUNCTION;
> > +}
> > +
> > +static target_ulong h_invalidate_pid(PowerPCCPU *cpu, sPAPRMachineState 
> > *spapr,
> > +                                     target_ulong opcode, target_ulong 
> > *args)
> > +{
> > +    qemu_log_mask(LOG_UNIMP, "Unimplemented SPAPR hcall 0x" TARGET_FMT_lx 
> > "%s\n",
> > +                  opcode, " (H_INVALIDATE_PID)");
> > +    return H_FUNCTION;
> > +}
> > +
> > +static target_ulong h_register_process_table(PowerPCCPU *cpu,
> > +                                             sPAPRMachineState *spapr,
> > +                                             target_ulong opcode,
> > +                                             target_ulong *args)
> > +{
> > +    qemu_log_mask(LOG_UNIMP, "Unimplemented SPAPR hcall 0x" TARGET_FMT_lx 
> > "%s\n",
> > +                  opcode, " (H_REGISTER_PROC_TBL)");
> > +    return H_FUNCTION;
> > +}
> > +
> >  #define H_SIGNAL_SYS_RESET_ALL         -1
> >  #define H_SIGNAL_SYS_RESET_ALLBUTSELF  -2
> >  
> > @@ -1094,6 +1120,11 @@ static void hypercall_register_types(void)
> >      spapr_register_hypercall(H_PAGE_INIT, h_page_init);
> >      spapr_register_hypercall(H_SET_MODE, h_set_mode);
> >  
> > +    /* In Memory Table MMU h-calls */
> > +    spapr_register_hypercall(H_CLEAN_SLB, h_clean_slb);
> > +    spapr_register_hypercall(H_INVALIDATE_PID, h_invalidate_pid);
> > +    spapr_register_hypercall(H_REGISTER_PROC_TBL, 
> > h_register_process_table);
> > +
> >      /* "debugger" hcalls (also used by SLOF). Note: We do -not- 
> > differenciate
> >       * here between the "CI" and the "CACHE" variants, they will use 
> > whatever
> >       * mapping attributes qemu is using. When using KVM, the kernel will
> > diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> > index 24da5dc27e..08cdb83953 100644
> > --- a/include/hw/ppc/spapr.h
> > +++ b/include/hw/ppc/spapr.h
> > @@ -347,6 +347,9 @@ struct sPAPRMachineState {
> >  #define H_XIRR_X                0x2FC
> >  #define H_RANDOM                0x300
> >  #define H_SET_MODE              0x31C
> > +#define H_CLEAN_SLB             0x374
> > +#define H_INVALIDATE_PID        0x378
> > +#define H_REGISTER_PROC_TBL     0x37C
> >  #define H_SIGNAL_SYS_RESET      0x380
> >  #define MAX_HCALL_OPCODE        H_SIGNAL_SYS_RESET
> >  
> > 
> 
> 

-- 
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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