Re: [Qemu-devel] [PATCH] target-ppc: Multiple/String Word alignment exception

[Alexander Graf]

On 31.03.16 01:29, David Gibson wrote:
> On Wed, 30 Mar 2016 19:13:00 +0200
> Laurent Vivier <address@hidden> wrote:
> 
>> If the processor is in little-endian mode, an alignment interrupt must
>> occur for the following instructions: lmw, stmw, lswi, lswx, stswi or stswx.
>>
>> This is what happens with KVM, so change TCG to do the same.
>>
>> As the instruction can be emulated by the kernel, enable the change
>> only in softmmu mode.
>>
>> Signed-off-by: Laurent Vivier <address@hidden>
> 
> I guess this makes sense given the existing hardware behaviour, even
> though it seems a bit perverse to me to make the emulator strictly less
> functional.
> 
> Alex, what do you think?

In general we only implement strict checks if it breaks guests not to
have them. Are you aware of any such case?


Alex