On 06/29/2011 02:58 PM, Josh Boyer wrote:
>> This makes me wonder if a similar thing might eventually be usable for >> running an i686 or x32 guest on an x86_64 KVM host. I have no idea if >> that is even theoretically possible, but if it is it might be better to >> rename the ioctl to be architecture agnostic. > >On x86 this is not required unless we want to "virtualize" pre-CPUID CPUs. Everything as of Pentium has a full bitmap of feature capabilities that KVM gets from user space, including information such as "Can we do 64-bit mode?". Ah. Thank you for the explanation.
To clarify a bit further, running an i686 guest on an x86_64 host is not only theoretically possible, but is done regularly. First, x86_64 is backwards compatible with i686 (so you can install a 32-bit OS on 64-bit hardware), and second, you can impersonate 32-bit guest hardware on a 64-bit host.
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