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 <redacted>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Co-developed-by: Andi Kleen <redacted>
Signed-off-by: Andi Kleen <redacted>
Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>

Reviewed-by: Joerg Roedel <redacted>