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Re: [XEN PATCH] x86/hvm: Use constants for x86 modes
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 31 Oct 2024 14:13:14 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Thu, 31 Oct 2024 14:13:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31/10/2024 1:27 pm, Teddy Astie wrote:
> In many places of x86 HVM code, constants integer are used to indicate in
> what mode is
> running the CPU (real, v86, 16-bits, 32-bits, 64-bits). However, these
> constants are
> are written directly as integer which hides the actual meaning of these modes.
>
> This patch introduces X86_MODE_* macros and replace those occurences with it.
>
> Signed-off-by Teddy Astie <teddy.astie@xxxxxxxxxx>
> ---
> I am not sure of other places that uses these integer constants.
I think you've got most of them.
The problem (and it's preexisting, not something with your change), is
that these aren't actually modes. They're all a combination of certain
aspects of various modes settings.
https://sandpile.org/x86/mode.htm has a pretty complete breakdown of modes.
The problem is that here, we mostly want a shorthand for "code segment
size", but including some aspects of how segmentation works.
~Andrew
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