Re: [Qemu-devel] [Qemu-ppc] [PATCH] target/ppc/cpu-models: set POWER9_v1.0 as POWER9 DD1

[Laurent Vivier]

On 30/06/2017 09:12, David Gibson wrote:
> On Thu, Jun 29, 2017 at 03:42:03PM +1000, Suraj Jitindar Singh wrote:
>> On Thu, 2017-06-29 at 15:37 +1000, Suraj Jitindar Singh wrote:
>>> On Wed, 2017-06-28 at 18:41 +0200, Greg Kurz wrote:
...
>>> That makes the assumption that DD2 doesn't require any work arounds
>>> which TCG can't handle.
>>
>> Actually TCG is really a non-issue since we'll just go into the POWER9
>> architected mode.
>>
>> Can't we just have -cpu POWER9 alias to DD1 for now and add DD2 when we
>> know the pvr?
> 
> No, because calling what qemu does DD1 is simply not accurate, in
> important and guest-visible ways.
> 
> What we should do is add in DD2.0 - we know the PVR, even if the
> chip's not out yet.  Then alias POWER9 to that.
> 

OK, I have patch that define v1.0 to DD1, v2 to DD2, and set the POWER9
alias to v2, but:
- on a DD1 host and KVM HV, "-cpu host" works well and "cpu POWER9"
(that select then the v1.0) boots the kernel and hangs at early boot of
the kernel (first display)
- in TCG mode, boot by default with v2, but some services does not start
correctly, and I have never the console login (perhaps because of some
time out: I test TCG on the POWER9 host, I should test on a x86 one).

I'm trying for the moment to understand why "-cpu POWER9" hangs while
"-cpu host" works.

Thanks,
Laurent