[PATCH v4 1/2] KVM: PPC: Add new capability to control MCE behaviour

[Aravinda Prasad]

On Thursday 12 January 2017 03:26 PM, Paul Mackerras wrote:
> On Mon, Jan 09, 2017 at 05:10:35PM +0530, Aravinda Prasad wrote:
>> This patch introduces a new KVM capability to control
>> how KVM behaves on machine check exception (MCE).
>> Without this capability, KVM redirects machine check
>> exceptions to guest's 0x200 vector, if the address in
>> error belongs to the guest. With this capability KVM
>> causes a guest exit with NMI exit reason.
>>
>> The new capability is required to avoid problems if
>> a new kernel/KVM is used with an old QEMU for guests
>> that don't issue "ibm,nmi-register". As old QEMU does
>> not understand the NMI exit type, it treats it as a
>> fatal error. However, the guest could have handled
>> the machine check error if the exception was delivered
>> to guest's 0x200 interrupt vector instead of NMI exit
>> in case of old QEMU.
> 
> You need to add a description of the new capability to
> Documentation/virtual/kvm/api.txt.

sure.

> 
> Paul.
> 

-- 
Regards,
Aravinda