Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

Jeremy Fitzhardinge
2010-07-09T05:33:11Z

On 07/08/2010 09:24 PM, Simon Horman wrote:
>> I think it would be a pretty large change. From the Xen's perspective,
>> any machine even approximately approaching the 2^44 limit will be
>> capable of running Xen guests in hvm mode, so PV isn't really a concern.
>>
> Hi Jeremy,
>
> Is the implication of that statement that HVM is preferred where
> supported by HW?
>

I wouldn't go that far; the PV vs HVM choice is pretty complex, and
depends on what your workload is and what hardware you have available.
All I meant was what I said: that if you're running on a machine with a
large amount of memory, then you should run your 32-bit domains as HVM
rather than PV. Though Xen could easily keep domains limited to memory
that they can actually use (it already does this, in fact).

J