Subject: Re: [PATCH v3 2/2] KVM: PPC: Exit guest upon MCE when FWNMI capability is enabled

From: Aravinda Prasad <[email-masked]>
Date: Wed, 22 Jun 2016 02:31:27 +0530

On Monday 20 June 2016 10:48 AM, Paul Mackerras wrote:
> Hi Aravinda,
> 
> On Wed, Jan 13, 2016 at 12:38:09PM +0530, Aravinda Prasad wrote:
>> Enhance KVM to cause a guest exit with KVM_EXIT_NMI
>> exit reasons upon a machine check exception (MCE) in
>> the guest address space if the KVM_CAP_PPC_FWNMI
>> capability is enabled (instead of delivering 0x200
>> interrupt to guest). This enables QEMU to build error
>> log and deliver machine check exception to guest via
>> guest registered machine check handler.
>>
>> This approach simplifies the delivering of machine
>> check exception to guest OS compared to the earlier
>> approach of KVM directly invoking 0x200 guest interrupt
>> vector. In the earlier approach QEMU was enhanced to
>> patch the 0x200 interrupt vector during boot. The
>> patched code at 0x200 issued a private hcall to pass
>> the control to QEMU to build the error log.
>>
>> This design/approach is based on the feedback for the
>> QEMU patches to handle machine check exception. Details
>> of earlier approach of handling machine check exception
>> in QEMU and related discussions can be found at:
>>
>> https://lists.nongnu.org/archive/html/qemu-devel/2014-11/msg00813.html
>>
>> Signed-off-by: Aravinda Prasad <[email-masked]>
> 
> Are you in the process of doing a new version of this patch with the
> requested changes?

Yes, I am working (intermittently) on the new version. But, not able to
finish off and post it. Will complete it and post the new version.

Regards,
Aravinda

> Paul.

-- 
Regards,
Aravinda