From: Tom Lendacky <thomas.lendacky@amd.com>
Date: Mon, 7 Sep 2020 15:15:03 +0200
Subject: KVM: SVM: Add GHCB definitions
Git-commit: d07f46f9f51afc7fc9f021eae19eba3c2e7870ac
Patch-mainline: v5.10-rc1
References: jsc#SLE-14337

Extend the vmcb_safe_area with SEV-ES fields and add a new
'struct ghcb' which will be used for guest-hypervisor communication.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-3-joro@8bytes.org
---
 arch/x86/include/asm/svm.h |   47 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -200,8 +200,55 @@ struct __attribute__ ((__packed__)) vmcb
 	u64 br_to;
 	u64 last_excp_from;
 	u64 last_excp_to;
+
+	/*
+	 * The following part of the save area is valid only for
+	 * SEV-ES guests when referenced through the GHCB.
+	 */
+	u8 reserved_7[104];
+	u64 reserved_8;		/* rax already available at 0x01f8 */
+	u64 rcx;
+	u64 rdx;
+	u64 rbx;
+	u64 reserved_9;		/* rsp already available at 0x01d8 */
+	u64 rbp;
+	u64 rsi;
+	u64 rdi;
+	u64 r8;
+	u64 r9;
+	u64 r10;
+	u64 r11;
+	u64 r12;
+	u64 r13;
+	u64 r14;
+	u64 r15;
+	u8 reserved_10[16];
+	u64 sw_exit_code;
+	u64 sw_exit_info_1;
+	u64 sw_exit_info_2;
+	u64 sw_scratch;
+	u8 reserved_11[56];
+	u64 xcr0;
+	u8 valid_bitmap[16];
+	u64 x87_state_gpa;
 };
 
+struct ghcb {
+	struct vmcb_save_area save;
+	u8 reserved_save[2048 - sizeof(struct vmcb_save_area)];
+
+	u8 shared_buffer[2032];
+
+	u8 reserved_1[10];
+	u16 protocol_version;	/* negotiated SEV-ES/GHCB protocol version */
+	u32 ghcb_usage;
+} __packed;
+
+
+#define EXPECTED_VMCB_SAVE_AREA_SIZE		1032
+#define EXPECTED_VMCB_CONTROL_AREA_SIZE		256
+#define EXPECTED_GHCB_SIZE			PAGE_SIZE
+
 struct __attribute__ ((__packed__)) vmcb {
 	struct vmcb_control_area control;
 	struct vmcb_save_area save;