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From: Laurent Vivier <lvivier@redhat.com>
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Date: Fri, 18 Nov 2016 14:03:44 +0100
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Subject: Re: [Qemu-devel] [PATCH] tests/postcopy: Use KVM on ppc64 only if
 it is KVM-HV
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To: Greg Kurz <groug@kaod.org>
Cc: Thomas Huth <thuth@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, David Gibson <david@gibson.dropbear.id.au>, qemu-ppc@nongnu.org, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org, Andrea Arcangeli <aarcange@redhat.com>, Eric Blake <eblake@redhat.com>



On 18/11/2016 13:53, Greg Kurz wrote:
> Hi Laurent,

Hi Greg,

> On Thu, 17 Nov 2016 21:22:33 +0100
> Laurent Vivier <lvivier@redhat.com> wrote:
> 
>> On 16/11/2016 15:17, Greg Kurz wrote:
>>> On Wed, 16 Nov 2016 14:17:47 +0100
>>> Thomas Huth <thuth@redhat.com> wrote:
>>>   
>>>> On 16.11.2016 13:37, Greg Kurz wrote:  
>>>>> On Wed, 16 Nov 2016 12:24:50 +0000
>>>>> "Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
>>>>>     
>>>>>> * Greg Kurz (groug@kaod.org) wrote:    
>>>>>>> On Wed, 16 Nov 2016 09:39:31 +0100
>>>>>>> Thomas Huth <thuth@redhat.com> wrote:
>>>>>>>       
>>>>>>>> The ppc64 postcopy test does not work with KVM-PR, and it is also
>>>>>>>> causing annoying warning messages when run on a x86 host. So let's
>>>>>>>> use KVM here only if we know that we're running with KVM-HV (which
>>>>>>>> automatically also means that we're running on a ppc64 host), and
>>>>>>>> fall back to TCG otherwise.
>>>>>>>>       
>> [..]
>>> The changes to the code look ok and I prefer to spend time chasing the
>>> KVM PR issue rather than arguing on a comment...  
>>
>> For the problem itself, it seems to appear only after a
>> BOOK3S_INTERRUPT_SYSCALL interrupt for an KVM_EXIT_PAPR_HCALL
>> (H_PUT_TERM_CHAR). In this case, KVM has to exit to QEMU to manage the
>> output. The following interrupt is always an BOOK3S_INTERRUPT_PROGRAM
>> with an emulation failure.
>>
> 
> Which specific problem are you referring to ? 
..
> 2) "Unexpected 32 on dest_serial serial" accompanied by the following in dmesg
> 
> [131613.428616] Couldn't emulate instruction 0x00000000 (op 0 xop 0)
> [131613.503515] kvmppc_handle_exit_pr: emulation at d8 failed (00000000)

This one, test running on a bare metal PowerMac G5 (F24), 4.9.0-rc5
kernel. And I have only and everytime this error.

Laurent