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| From: | Joao Martins |
| Subject: | Re: [PATCH RFCv2 2/4] i386/pc: relocate 4g start to 1T where applicable |
| Date: | Tue, 15 Feb 2022 19:37:40 +0000 |
On 2/15/22 09:53, Gerd Hoffmann wrote:
> What is missing:
>
> * Some way for the firmware to get a phys-bits value it can actually
> use. One possible way would be to have a paravirtual bit somewhere
> telling whenever host-phys-bits is enabled or not.
>
If we are not talking about *very old* processors... isn't what already
advertised in CPUID.80000008 EAX enough? That's the maxphysaddr width
on x86, which on qemu we do set it with the phys-bits value;
Joao
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