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Re: [Qemu-ppc] Qemu pSeries AIX ADB boot

From: Alexander Graf
Subject: Re: [Qemu-ppc] Qemu pSeries AIX ADB boot
Date: Tue, 12 Jun 2012 11:36:34 +0200
User-agent: Thunderbird (X11/20090817)

Thomas Huth wrote:
> Am Tue, 12 Jun 2012 10:45:28 +0200
> schrieb Alexander Graf <address@hidden>:
>> Michael Sabino wrote:
> [...]
>>> Here is some sPAPR pSeries Partition Pool code that I think is better
>>> than the version in the aix qemu tree. It seems to compile, but it
>>> does not get me any further as far as I can tell.
>>> It's based on the suggestion of Alex to look at
>>> http://lxr.free-electrons.com/source/arch/powerpc/kernel/lparcfg.c?a=m68k#L108.
>>> static target_ulong h_get_ppp(CPUPPCState *env, sPAPREnvironment *spapr,
>>>                               target_ulong opcode, target_ulong *args)
>>> {
>>>     printf("\nh_get_ppp might not be right yet\n");
>>>     env->gpr[4] = 100; // Processor capacity percentage
>>>     env->gpr[5] = 0; // Unallocated processor capacity percentage
>> This won't work. args is synchronized back onto the GPRs.
> That does not sound nice ... where does this happen? 

Check out emulate_spapr_hypercall and spapr_hypercall in hw/spapr*c :).

> And what's the
> correct way to set a GPR in a hypercall?

Ah, it does work, because args == &env->gpr[4]. Sorry :). It'd still be
better to set args[0] rather than gpr[4] to be consistent with the rest
of the code.


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