Re: [PATCH Part1 RFC v4 02/36] x86/sev: Save the negotiated GHCB version

Borislav Petkov
2021-08-10T09:16:45Z

On Wed, Jul 07, 2021 at 01:14:32PM -0500, Brijesh Singh wrote:
> diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
> index 114f62fe2529..19c2306ac02d 100644
> --- a/arch/x86/kernel/sev-shared.c
> +++ b/arch/x86/kernel/sev-shared.c
> @@ -14,6 +14,15 @@
> #define has_cpuflag(f) boot_cpu_has(f)
> #endif
>
> +/*
> + * Since feature negotiation related variables are set early in the boot
> + * process they must reside in the .data section so as not to be zeroed
> + * out when the .bss section is later cleared.
> + *
> + * GHCB protocol version negotiated with the hypervisor.
> + */
> +static u16 ghcb_version __section(".data..ro_after_init");

There's a define for that section specifier: __ro_after_init

--
Regards/Gruss,
Boris.