Re: [PATCH] KVM: PPC: Exit guest upon fatal machine check exception

[Aravinda Prasad <aravinda@linux.vnet.ibm.com>]

On Friday 13 November 2015 01:08 PM, Thomas Huth wrote:
> On 13/11/15 07:26, Aravinda Prasad wrote:
>>
>> On Friday 13 November 2015 07:20 AM, David Gibson wrote:
>>> On Thu, Nov 12, 2015 at 11:22:29PM +0530, Aravinda Prasad wrote:
> [...]
>>>> So thinking whether qemu should explicitly enable the new NMI
>>>> behavior.
>>>
>>> So, I think the reasoning above tends towards having qemu control the
>>> MC behaviour.  If qemu does nothing, MCs are delivered direct to
>>> 0x200, if it enables the new handling, they cause a KVM exit and qemu
>>> will deliver the MC.
>>
>> This essentially requires qemu to control how KVM behaves as KVM does
>> the actual redirection of MC either to guest's 0x200 vector or to exit
>> guest. So, if we are running new qemu, then KVM should exit guest and if
>> we are running old qemu, KVM should redirect MC to 0x200. Is there any
>> way to communicate this to KVM? ioctl?
> 
> Simply introduce a KVM capability that can be enabled by userspace.
> See kvm_vcpu_ioctl_enable_cap() in arch/powerpc/kvm/powerpc.c.

Thanks. I will look at it.

Regards,
Aravinda

> 
>  Thomas
> 

-- 
Regards,
Aravinda