KVM: SVM: Add GHCB definitions

	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

static inline void __unused_size_checks(void)

{

	BUILD_BUG_ON(sizeof(struct vmcb_save_area) != 0x298);

	BUILD_BUG_ON(sizeof(struct vmcb_control_area) != 256);

	BUILD_BUG_ON(sizeof(struct vmcb_save_area)	!= EXPECTED_VMCB_SAVE_AREA_SIZE);

	BUILD_BUG_ON(sizeof(struct vmcb_control_area)	!= EXPECTED_VMCB_CONTROL_AREA_SIZE);

	BUILD_BUG_ON(sizeof(struct ghcb)		!= EXPECTED_GHCB_SIZE);

}

struct __attribute__ ((__packed__)) vmcb {

static int __init svm_init(void)

{

	__unused_size_checks();

	return kvm_init(&svm_init_ops, sizeof(struct vcpu_svm),

			__alignof__(struct vcpu_svm), THIS_MODULE);

}