Re: [PATCH v3] vm: optional 16K-page guest kernel builds

[Alyssa Ross <hi@alyssa.is>]

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colbyt <colby@colbyt.com> writes:

> KVM hosts with a 16K stage-2 granule (Apple Silicon machines running
> upstream kernels, NVIDIA GB10) can only run guests whose kernel is built
> with ARM64_16K_PAGES. Add an optional kernelPageSize argument to the app
> and net VM kernel builds; the default is unchanged. A 16K-page guest
> Image built this way has booted to a full session under a 16K host here
> since June without issues on my side.
> ---
> v3/v2: no code change — drop a stray in-body From line that would have
> misattributed authorship when applied.
>
> Following up on the offer in my July 7 mail, as a standalone patch now
> that the nixpkgs update brings Linux 7.1. The config delta is five
> lines; the edit (an argument defaulting to today's behavior) is a
> proposal — happy to rework it if you'd rather structure it differently,
> e.g. hang it off a single shared helper instead of two arguments.

My instinct is that we should just always use a 16K page kernel on
aarch64 hosts.  AIUI the main reason most Linux distributions don't is
to retain compatibility with binaries that may assume only 4K alignment
is needed, but on the Spectrum host we should never be running binaries
we didn't build ourselves.

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