[kvm-unit-tests PATCH v2 12/14] x86/sev: Use X86_PROPERTY_SEV_C_BIT to get the AMD SEV C-bit location

[Sean Christopherson <seanjc@google.com>]

Use X86_PROPERTY_SEV_C_BIT instead of open coding equivalent functionality,
and delete the overly-verbose CPUID_FN_ENCRYPT_MEM_CAPAB macro.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 lib/x86/amd_sev.c | 10 +---------
 lib/x86/amd_sev.h |  6 ------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/lib/x86/amd_sev.c b/lib/x86/amd_sev.c
index b7cefd0f..da0e2077 100644
--- a/lib/x86/amd_sev.c
+++ b/lib/x86/amd_sev.c
@@ -33,19 +33,11 @@ bool amd_sev_enabled(void)
 
 efi_status_t setup_amd_sev(void)
 {
-	struct cpuid cpuid_out;
-
 	if (!amd_sev_enabled()) {
 		return EFI_UNSUPPORTED;
 	}
 
-	/*
-	 * Extract C-Bit position from ebx[5:0]
-	 * AMD64 Architecture Programmer's Manual Volume 3
-	 *   - Section " Function 8000_001Fh - Encrypted Memory Capabilities"
-	 */
-	cpuid_out = cpuid(CPUID_FN_ENCRYPT_MEM_CAPAB);
-	amd_sev_c_bit_pos = (unsigned short)(cpuid_out.b & 0x3f);
+	amd_sev_c_bit_pos = this_cpu_property(X86_PROPERTY_SEV_C_BIT);
 
 	return EFI_SUCCESS;
 }
diff --git a/lib/x86/amd_sev.h b/lib/x86/amd_sev.h
index defcda75..daa33a05 100644
--- a/lib/x86/amd_sev.h
+++ b/lib/x86/amd_sev.h
@@ -19,12 +19,6 @@
 #include "asm/page.h"
 #include "efi.h"
 
-/*
- * AMD Programmer's Manual Volume 3
- *   - Section "Function 8000_001Fh - Encrypted Memory Capabilities"
- */
-#define CPUID_FN_ENCRYPT_MEM_CAPAB    0x8000001f
-
 /*
  * AMD Programmer's Manual Volume 2
  *   - Section "SEV_STATUS MSR"
-- 
2.50.0.rc0.642.g800a2b2222-goog