On 22.06.2023 19:42, Alejandro Vallejo wrote:
> --- a/xen/arch/x86/cpu/microcode/core.c
> +++ b/xen/arch/x86/cpu/microcode/core.c
> @@ -867,10 +867,21 @@ int __init early_microcode_init(unsigned long
> *module_map,
> return -ENODEV;
> }
>
> - microcode_grab_module(module_map, mbi);
> -
> ucode_ops.collect_cpu_info();
>
> + /*
> + * Some hypervisors deliberately report a microcode revision of -1 to
> + * mean that they will not accept microcode updates. We take the hint
> + * and ignore the microcode interface in that case.
> + */
> + if ( this_cpu(cpu_sig).rev == ~0 ) {
Nit: Style (brace placement). Can probably be fixed up while
committing, if no other issues arise.
Jan
