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Re: [XEN PATCH] x86/hvm: Use constants for x86 modes
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 31 Oct 2024 15:21:06 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Thu, 31 Oct 2024 14:21:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.10.2024 14:27, 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.
At the very least svm_guest_x86_mode() also wants changing.
> @@ -2952,11 +2952,11 @@ static const char *guest_x86_mode_to_str(int mode)
> {
> switch ( mode )
> {
> - case 0: return "Real";
> - case 1: return "v86";
> - case 2: return "16bit";
> - case 4: return "32bit";
> - case 8: return "64bit";
> + case X86_MODE_REAL: return "Real";
> + case X86_MODE_V86: return "v86";
> + case X86_MODE_16BIT: return "16bit";
> + case X86_MODE_32BIT: return "32bit";
> + case X86_MODE_64BIT: return "64bit";
Please don't break columnar alignment here. As hinted at in the other reply
already, personally I'd prefer VM86 anyway.
Jan
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