Re: [PATCH v4 04/19] x86/cea: Export per CPU array 'cea_exception_stacks' for KVM to use

[Christoph Hellwig]

On Fri, Mar 28, 2025 at 10:11:50AM -0700, Xin Li (Intel) wrote:
> The per CPU array 'cea_exception_stacks' points to per CPU stacks
> +/*
> + * FRED introduced new fields in the host-state area of the VMCS for
> + * stack levels 1->3 (HOST_IA32_FRED_RSP[123]), each respectively
> + * corresponding to per CPU stacks for #DB, NMI and #DF.  KVM must
> + * populate these each time a vCPU is loaded onto a CPU.
> + */
> +EXPORT_PER_CPU_SYMBOL(cea_exception_stacks);

Exporting data vs accessors for it is usually a bad idea.  Doing a
non-_GPl for such a very low level data struture is even worse.