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SubjectRe: [PATCH 2/3] Documentation: riscv: Add documentation that describes the VM layout
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Le 2/25/21 à 5:34 AM, David Hildenbrand a écrit :
>                  |            |                  |         |> +
> ffffffc000000000 | -256    GB | ffffffc7ffffffff |   32 GB | kasan
>> +   ffffffcefee00000 | -196    GB | ffffffcefeffffff |    2 MB | fixmap
>> +   ffffffceff000000 | -196    GB | ffffffceffffffff |   16 MB | PCI io
>> +   ffffffcf00000000 | -196    GB | ffffffcfffffffff |    4 GB | vmemmap
>> +   ffffffd000000000 | -192    GB | ffffffdfffffffff |   64 GB |
>> vmalloc/ioremap space
>> +   ffffffe000000000 | -128    GB | ffffffff7fffffff |  126 GB |
>> direct mapping of all physical memory
>
> ^ So you could never ever have more than 126 GB, correct?
>
> I assume that's nothing new.
>

Before this patch, the limit was 128GB, so in my sense, there is nothing
new. If ever we want to increase that limit, we'll just have to lower
PAGE_OFFSET, there is still some unused virtual addresses after kasan
for example.

Thanks,

Alex

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