RE: [Xen-devel] [PATCH 3/5] vtdt: Modify vlapic code to add vtdt support

["Wei, Gang" <gang.wei@xxxxxxxxx>]

Keir Fraser wrote on 2010-12-14:
> On 14/12/2010 03:27, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote:
> 
>> diff -r d042ca4c6b68 xen/include/public/arch-x86/hvm/save.h
>> --- a/xen/include/public/arch-x86/hvm/save.h Thu Dec 09 22:33:02
>> 2010
>> +0800
>> +++ b/xen/include/public/arch-x86/hvm/save.h Thu Dec 09 22:33:06
>> +++ 2010
>> +++ +0800
>> @@ -265,6 +265,7 @@ struct hvm_hw_lapic {
>>      uint64_t             apic_base_msr;
>>      uint32_t             disabled; /* VLAPIC_xx_DISABLED */
>>      uint32_t             timer_divisor;
>> +    uint64_t             tdt_msr;
>>  };
> 
> Is this backward compatible with old HVM save images?

I am not sure about this. If it isn't, would you accept to simply add another 
data trunk for TDT msr?

Jimmy

> 
> We ought to support extending the size of existing HVM save
> structures, but I'm not sure that we do. Tim?


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