tgingold@xxxxxxx wrote:
> Quoting "Dong, Eddie" <eddie.dong@xxxxxxxxx>:
>
>> tgingold@xxxxxxx wrote:
>>> Quoting "Dong, Eddie" <eddie.dong@xxxxxxxxx>:
>>>> Not sure if anybody ever tried to run Xen/IA64 VMM in Xen/IA64 HVM
>>>> guest? It may not be already there, but looks like not that far.
>>>
>>> I tried in the past, but it doesn't work out of the box. You of
>>> course can't run bare Xen within VTi, but a modified version can
>>> run.
>>
>> Why? The goal of hardware virtualization is to provide architecture
>> equavalent virtualization. We may see the gap.
>
> Xen requires 61 bits of VA, while Vti only provides 60. That's the
Yes, we met this too yesterday, current Xen/IA64 doesn't check supported
VA address bits # in architecture safe way, it just assume it is 61
bits.
> main issue my patch addresses. The other issue is VHPT long format.
Can u repost it? We need to make Xen/IA64 following SDM.
Yes, LVHPT is another major gap, good catch indeed!
This is worth to solving, and it should not be a very big effort if we
don't work guest page table. Luckily, today's Xen/IA64 is implementing
virtual TLB rather than shadow page table which makes it simple, right?
If we really push paravirt_ops or hybrid forward to maintain
backward compatability, this is probably the way we can go.
> Currently Xen/VTi allows it but doesn't use it.
BTW, in Xen/X86 side, running Xen in X86 HVM is fine. So eventually we
should be able to do that too.
Thx, eddie
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