Re: [Qemu-devel] [PATCH qemu] qemu-options: Add documentation about PPC64's "-cpu compat" option

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 04/08/2015 06:43 AM, Alexander Graf wrote:
> On 04/02/2015 08:26 AM, Alexey Kardashevskiy wrote:
>> Since 8dfa3a5e "target-ppc: Add "compat" CPU option" (which was a part of
>> client-architecture-support patchset) there is a "compat" option
>> of "-cpu". However it was not documented at all and this is what this
>> patch is trying to do.
>>
>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>> ---
>>   qemu-options.hx | 11 ++++++++++-
>>   1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/qemu-options.hx b/qemu-options.hx
>> index c513352..bd15214 100644
>> --- a/qemu-options.hx
>> +++ b/qemu-options.hx
>> @@ -84,11 +84,20 @@ HXCOMM Deprecated by -machine
>>   DEF("M", HAS_ARG, QEMU_OPTION_M, "", QEMU_ARCH_ALL)
>>   DEF("cpu", HAS_ARG, QEMU_OPTION_cpu,
>> -    "-cpu cpu        select CPU ('-cpu help' for list)\n", QEMU_ARCH_ALL)
>> +    "-cpu cpu,[compat=MODE]\n"
>> +    "                select CPU ('-cpu help' for list)\n"
>> +    "                compat= processor compatibility mode (PPC64 only)\n",
>> +        QEMU_ARCH_ALL)
>
> Shouldn't there be a way to show this only for the ppc64 target?


I do not really know, I did not dig deep. I just saw "Intel IOMMU (VT-d)" 
in "qemu-system-ppc64 --help" output and concluded there is no easy way.



>
>
> Alex
>
>>   STEXI
>>   @item -cpu @var{model}
>>   @findex -cpu
>>   Select CPU model (@code{-cpu help} for list and additional feature
>> selection)
>> +@table @option
>> +@item compat=power6|power7|power8
>> +(PPC64 only)
>> +Enables architecture compatibility mode. "power6" enables PowerISA 2.05,
>> +"power7" - 2.06, "power8" - 2.07.
>> +@end table
>>   ETEXI
>>   DEF("smp", HAS_ARG, QEMU_OPTION_smp,
>


-- 
Alexey