Re: [PATCH] mem/x86: add processor address space check for VM memory

[David Hildenbrand]

On 18.09.23 12:11, Ani Sinha wrote:

>     Ok hopefully my last question. I am still confused on something.
>     Does the above mean that the hole64 will actually start from an
>     address that is beyond maxram? Like basically if you added all of
>     ram_below_4G, ram_above_4G, hot plug_mem and pci_hole64 then can it
>     exceed maxram? I think it will. Does this not an issue?

If you'd have a 2 GiB VM, the device memory region and hole64 would 
always be placed >= 4 GiB address, yes.

As maxram is just a size, and not a PFN, I don't think there is any 
issue with that.

ms->maxram_size is usually only used in combination with ms->ram_size to
detect if memory devices will be enabled, and to size that region for 
memory devices.

--
Cheers,

David / dhildenb