[PATCH 02/11] x86/sev: Add an x86 version of prot_guest_has()

[Joerg Roedel]

On Tue, Jul 27, 2021 at 05:26:05PM -0500, Tom Lendacky wrote:
> Introduce an x86 version of the prot_guest_has() function. This will be
> used in the more generic x86 code to replace vendor specific calls like
> sev_active(), etc.
> 
> While the name suggests this is intended mainly for guests, it will
> also be used for host memory encryption checks in place of sme_active().
> 
> The amd_prot_guest_has() function does not use EXPORT_SYMBOL_GPL for the
> same reasons previously stated when changing sme_active(), sev_active and
> sme_me_mask to EXPORT_SYBMOL:
>   commit 87df26175e67 ("x86/mm: Unbreak modules that rely on external PAGE_KERNEL availability")
>   commit 9d5f38ba6c82 ("x86/mm: Unbreak modules that use the DMA API")
> 
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Cc: Ingo Molnar <mingo at redhat.com>
> Cc: Borislav Petkov <bp at alien8.de>
> Cc: Dave Hansen <dave.hansen at linux.intel.com>
> Cc: Andy Lutomirski <luto at kernel.org>
> Cc: Peter Zijlstra <peterz at infradead.org>
> Co-developed-by: Andi Kleen <ak at linux.intel.com>
> Signed-off-by: Andi Kleen <ak at linux.intel.com>
> Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy at linux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy at linux.intel.com>
> Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>

Reviewed-by: Joerg Roedel <jroedel at suse.de>