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Re: [Xen-devel] [PATCH] x86/pv: Drop create_pae_xen_mappings()

On 08/24/2017 09:40 AM, Jan Beulich wrote:
>>>> On 23.08.17 at 20:11, <andrew.cooper3@xxxxxxxxxx> wrote:
>> This is leftovers from the 32bit hypervisor days.  The only Xen content in
>> this virtual range for 32bit PV guests is the compat M2P.  It is not critical
>> that the mapping is present, nor is it critical that the slot is unshared.
> Hmm, while technically correct this would allow 32-bit guests to
> run on newer hypervisors that would fail on older ones. I'm not
> sure this is a good idea, but I'm also not entirely opposed to it.

I think I'm missing something; why would some 32-bit guests fail on
hypervisors which still had this mapping (which is what I presume you
mean by "older hypervisors")?


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