Re: [PATCH -v2] QEMU-KVM: MCE: Relay UCR MCE to guest

[Avi Kivity <avi@redhat.com>]

On 09/09/2009 03:06 PM, Avi Kivity wrote:
> On 09/09/2009 05:28 AM, Huang Ying wrote:
>> UCR (uncorrected recovery) MCE is supported in recent Intel CPUs,
>> where some hardware error such as some memory error can be reported
>> without PCC (processor context corrupted). To recover from such MCE,
>> the corresponding memory will be unmapped, and all processes accessing
>> the memory will be killed via SIGBUS.
>>
>> For KVM, if QEMU/KVM is killed, all guest processes will be killed
>> too. So we relay SIGBUS from host OS to guest system via a UCR MCE
>> injection. Then guest OS can isolate corresponding memory and kill
>> necessary guest processes only. SIGBUS sent to main thread (not VCPU
>> threads) will be broadcast to all VCPU threads as UCR MCE.
>>
>> v2:
>>
>> - Use qemu_ram_addr_from_host instead of self made one to covert from
>>    host address to guest RAM address. Thanks Anthony Liguori.
>>
>
> Patch looks good, but can you clarify the following:

Oh and I forgot - please make MCE injection optional.  Some 
installations may prefer to kill the guest and have the virtualization 
management system restart it rather than trust the guest to handle the 
MCE properly.

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