[edk2-devel] [PATCH 06/13] MdePkg/Register/Amd: define GHCB macros for SNP AP creation

[Brijesh Singh]

From: Tom Lendacky <thomas.lendacky at amd.com>

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

Version 2 of GHCB introduces NAE for creating AP when SEV-SNP is
enabled in the guest VM. See the GHCB spec section for additional
details.

While at it, define the VMSA state save area that are required for
creating the AP. The save area format is defined in AMD APM volume
2 (Table B-4).

Cc: James Bottomley <jejb at linux.ibm.com>
Cc: Min Xu <min.m.xu at intel.com>
Cc: Jiewen Yao <jiewen.yao at intel.com>
Cc: Tom Lendacky <thomas.lendacky at amd.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Erdem Aktas <erdemaktas at google.com>
Cc: Michael D Kinney <michael.d.kinney at intel.com>
Cc: Liming Gao <gaoliming at byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu at intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh at amd.com>
---
 MdePkg/Include/Register/Amd/Ghcb.h | 70 ++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/MdePkg/Include/Register/Amd/Ghcb.h b/MdePkg/Include/Register/Amd/Ghcb.h
index a15b4b7e2760..956cefbc003c 100644
--- a/MdePkg/Include/Register/Amd/Ghcb.h
+++ b/MdePkg/Include/Register/Amd/Ghcb.h
@@ -55,6 +55,7 @@
 #define SVM_EXIT_AP_RESET_HOLD                  0x80000004ULL
 #define SVM_EXIT_AP_JUMP_TABLE                  0x80000005ULL
 #define SVM_EXIT_SNP_PAGE_STATE_CHANGE          0x80000010ULL
+#define SVM_EXIT_SNP_AP_CREATION                0x80000013ULL
 #define SVM_EXIT_HYPERVISOR_FEATURES            0x8000FFFDULL
 #define SVM_EXIT_UNSUPPORTED                    0x8000FFFFULL
 
@@ -83,6 +84,12 @@
 #define IOIO_SEG_ES         0
 #define IOIO_SEG_DS         (BIT11 | BIT10)
 
+//
+// AP Creation Information
+//
+#define SVM_VMGEXIT_SNP_AP_CREATE_ON_INIT  0
+#define SVM_VMGEXIT_SNP_AP_CREATE          1
+#define SVM_VMGEXIT_SNP_AP_DESTROY         2
 
 typedef PACKED struct {
   UINT8                  Reserved1[203];
@@ -195,4 +202,67 @@ typedef struct {
   SNP_PAGE_STATE_ENTRY   Entry[SNP_PAGE_STATE_MAX_ENTRY];
 } SNP_PAGE_STATE_CHANGE_INFO;
 
+//
+// SEV-ES save area mapping structures used for SEV-SNP AP Creation.
+// Only the fields required to be set to a non-zero value are defined.
+//
+#pragma pack(1)
+typedef struct {
+  UINT16  Selector;
+  UINT16  Attributes;
+  UINT32  Limit;
+  UINT64  Base;
+} SEV_ES_SEGMENT_REGISTER;
+#pragma pack()
+
+#define SEV_ES_RESET_CS_ATTRIBUTES    (BIT7 | BIT4 | BIT3 | BIT1)
+#define SEV_ES_RESET_DS_ATTRIBUTES    (BIT7 | BIT4 | BIT1)
+#define SEV_ES_RESET_ES_ATTRIBUTES    SEV_ES_RESET_DS_ATTRIBUTES
+#define SEV_ES_RESET_FS_ATTRIBUTES    SEV_ES_RESET_DS_ATTRIBUTES
+#define SEV_ES_RESET_GS_ATTRIBUTES    SEV_ES_RESET_DS_ATTRIBUTES
+#define SEV_ES_RESET_SS_ATTRIBUTES    SEV_ES_RESET_DS_ATTRIBUTES
+
+#define SEV_ES_RESET_GDTR_ATTRIBUTES  0
+#define SEV_ES_RESET_LDTR_ATTRIBUTES  (BIT7 | 2)
+#define SEV_ES_RESET_IDTR_ATTRIBUTES  0
+#define SEV_ES_RESET_TR_ATTRIBUTES    (BIT7 | 3)
+
+#pragma pack(1)
+typedef struct {
+  SEV_ES_SEGMENT_REGISTER  Es;
+  SEV_ES_SEGMENT_REGISTER  Cs;
+  SEV_ES_SEGMENT_REGISTER  Ss;
+  SEV_ES_SEGMENT_REGISTER  Ds;
+  SEV_ES_SEGMENT_REGISTER  Fs;
+  SEV_ES_SEGMENT_REGISTER  Gs;
+  SEV_ES_SEGMENT_REGISTER  Gdtr;
+  SEV_ES_SEGMENT_REGISTER  Ldtr;
+  SEV_ES_SEGMENT_REGISTER  Idtr;
+  SEV_ES_SEGMENT_REGISTER  Tr;
+  UINT8                    Reserved1[42];
+  UINT8                    Vmpl;
+  UINT8                    Reserved2[5];
+  UINT64                   Efer;
+  UINT8                    Reserved3[112];
+  UINT64                   Cr4;
+  UINT8                    Reserved4[8];
+  UINT64                   Cr0;
+  UINT64                   Dr7;
+  UINT64                   Dr6;
+  UINT64                   Rflags;
+  UINT64                   Rip;
+  UINT8                    Reserved5[232];
+  UINT64                   GPat;
+  UINT8                    Reserved6[320];
+  UINT64                   SevFeatures;
+  UINT8                    Reserved7[48];
+  UINT64                   XCr0;
+  UINT8                    Reserved8[24];
+  UINT32                   Mxcsr;
+  UINT64                   X87Ftw;
+  UINT64                   Reserved9[8];
+  UINT64                   X87Fcw;
+} SEV_ES_SAVE_AREA;
+#pragma pack()
+
 #endif
-- 
2.17.1



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