[PATCH RFC v2 01/28] MdePkg: Expand the SEV MSR to include the SNP definition

["Brijesh Singh" <brijesh.singh@amd.com>]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275

Define the SEV-SNP MSR bits.

Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 MdePkg/Include/Register/Amd/Fam17Msr.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/MdePkg/Include/Register/Amd/Fam17Msr.h b/MdePkg/Include/Register/Amd/Fam17Msr.h
index e4db09c518..4d33bef220 100644
--- a/MdePkg/Include/Register/Amd/Fam17Msr.h
+++ b/MdePkg/Include/Register/Amd/Fam17Msr.h
@@ -87,7 +87,12 @@ typedef union {
     ///
     UINT32  SevEsBit:1;
 
-    UINT32  Reserved:30;
+    ///
+    /// [Bit 2] Secure Nested Paging (SevSnp) is enabled
+    ///
+    UINT32  SevSnpBit:1;
+
+    UINT32  Reserved:29;
   } Bits;
   ///
   /// All bit fields as a 32-bit value
-- 
2.17.1