Re: [PATCH v4 2/2] kern/xen: Add Xen command line parsing

[Aaron Rainbolt <arraybolt3@xxxxxxxxx>]

On Mon, 4 Aug 2025 23:50:09 -0500
Aaron Rainbolt <arraybolt3@xxxxxxxxx> wrote:

> Xen traditionally allows customizing guest behavior by passing
> arguments to the VM kernel via the kernel command line. This is no
> longer possible when using GRUB with Xen, as the kernel command line
> is decided by the GRUB configuration file within the guest, not data
> passed to the guest by Xen.
> 
> To work around this limitation, enable GRUB to parse a command line
> passed to it by Xen, and expose data from the command line to the GRUB
> configuration as environment variables. These variables can be used in
> the GRUB configuration for any desired purpose, such as extending the
> kernel command line passed to the guest. The command line format is
> inspired by the Linux kernel's command line format.
> 
> To reduce the risk of misuse, abuse, or accidents in production, the
> command line will only be parsed if it consists entirely of 7-bit
> ASCII characters, only alphabetical characters and underscores are
> permitted in variable names, and all variable names must start with
> the string "xen_grub_env_". This also allows room for expanding the
> command line arguments accepted by GRUB in the future, should other
> arguments end up becoming desirable in the future.

Darn. I sent this patch as a reply to the previous patch in the stack,
not as a reply to the cover letter. That's probably not the right way
to do things.

I should just set up git-send-email and stop trying to make Claws Mail
barely work for this kind of thing... Will resend the patch soon-ish,
this time formatted right (unless that would just cause needless noise).

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