Re: [Xen-devel] [PATCH v3 16/17] SUPPORT.md: Add limits RFC

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.11.17 at 20:20, <george.dunlap@xxxxxxxxxx> wrote:
> +### Virtual RAM
> +
> +    Limit-security, x86 PV 64-bit: 2047GiB
> +    Limit-security, x86 PV 32-bit: 168GiB (see below)
> +    Limit-security, x86 HVM: 1.5TiB
> +    Limit, ARM32: 16GiB
> +    Limit, ARM64: 1TiB
> +
> +Note that there are no theoretical limits to 64-bit PV or HVM guest sizes
> +other than those determined by the processor architecture.
> +
> +All 32-bit PV guest memory must be under 168GiB;
> +this means the total memory for all 32-bit PV guests cannot exced 168GiB.

While certainly harder to grok for the reader, I think we need to be
precise here: The factor isn't the amount of memory, but the
addresses at which it surfaces. Host memory must not extend
beyond the 168MiB boundary for that to also be the limit for
32-bit PV guests.

Jan


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