hvgdk.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Type definitions for the Microsoft Hypervisor.
 */
#ifndef _HV_HVGDK_H
#define _HV_HVGDK_H

#include "hvgdk_mini.h"
#include "hvgdk_ext.h"

/*
 * The guest OS needs to register the guest ID with the hypervisor.
 * The guest ID is a 64 bit entity and the structure of this ID is
 * specified in the Hyper-V TLFS specification.
 *
 * While the current guideline does not specify how Linux guest ID(s)
 * need to be generated, our plan is to publish the guidelines for
 * Linux and other guest operating systems that currently are hosted
 * on Hyper-V. The implementation here conforms to this yet
 * unpublished guidelines.
 *
 * Bit(s)
 * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
 * 62:56 - Os Type; Linux is 0x100
 * 55:48 - Distro specific identification
 * 47:16 - Linux kernel version number
 * 15:0  - Distro specific identification
 */

#define HV_LINUX_VENDOR_ID              0x8100

/* HV_VMX_ENLIGHTENED_VMCS */
struct hv_enlightened_vmcs {
	u32 revision_id;
	u32 abort;

	u16 host_es_selector;
	u16 host_cs_selector;
	u16 host_ss_selector;
	u16 host_ds_selector;
	u16 host_fs_selector;
	u16 host_gs_selector;
	u16 host_tr_selector;

	u16 padding16_1;

	u64 host_ia32_pat;
	u64 host_ia32_efer;

	u64 host_cr0;
	u64 host_cr3;
	u64 host_cr4;

	u64 host_ia32_sysenter_esp;
	u64 host_ia32_sysenter_eip;
	u64 host_rip;
	u32 host_ia32_sysenter_cs;

	u32 pin_based_vm_exec_control;
	u32 vm_exit_controls;
	u32 secondary_vm_exec_control;

	u64 io_bitmap_a;
	u64 io_bitmap_b;
	u64 msr_bitmap;

	u16 guest_es_selector;
	u16 guest_cs_selector;
	u16 guest_ss_selector;
	u16 guest_ds_selector;
	u16 guest_fs_selector;
	u16 guest_gs_selector;
	u16 guest_ldtr_selector;
	u16 guest_tr_selector;

	u32 guest_es_limit;
	u32 guest_cs_limit;
	u32 guest_ss_limit;
	u32 guest_ds_limit;
	u32 guest_fs_limit;
	u32 guest_gs_limit;
	u32 guest_ldtr_limit;
	u32 guest_tr_limit;
	u32 guest_gdtr_limit;
	u32 guest_idtr_limit;

	u32 guest_es_ar_bytes;
	u32 guest_cs_ar_bytes;
	u32 guest_ss_ar_bytes;
	u32 guest_ds_ar_bytes;
	u32 guest_fs_ar_bytes;
	u32 guest_gs_ar_bytes;
	u32 guest_ldtr_ar_bytes;
	u32 guest_tr_ar_bytes;

	u64 guest_es_base;
	u64 guest_cs_base;
	u64 guest_ss_base;
	u64 guest_ds_base;
	u64 guest_fs_base;
	u64 guest_gs_base;
	u64 guest_ldtr_base;
	u64 guest_tr_base;
	u64 guest_gdtr_base;
	u64 guest_idtr_base;

	u64 padding64_1[3];

	u64 vm_exit_msr_store_addr;
	u64 vm_exit_msr_load_addr;
	u64 vm_entry_msr_load_addr;

	u64 cr3_target_value0;
	u64 cr3_target_value1;
	u64 cr3_target_value2;
	u64 cr3_target_value3;

	u32 page_fault_error_code_mask;
	u32 page_fault_error_code_match;

	u32 cr3_target_count;
	u32 vm_exit_msr_store_count;
	u32 vm_exit_msr_load_count;
	u32 vm_entry_msr_load_count;

	u64 tsc_offset;
	u64 virtual_apic_page_addr;
	u64 vmcs_link_pointer;

	u64 guest_ia32_debugctl;
	u64 guest_ia32_pat;
	u64 guest_ia32_efer;

	u64 guest_pdptr0;
	u64 guest_pdptr1;
	u64 guest_pdptr2;
	u64 guest_pdptr3;

	u64 guest_pending_dbg_exceptions;
	u64 guest_sysenter_esp;
	u64 guest_sysenter_eip;

	u32 guest_activity_state;
	u32 guest_sysenter_cs;

	u64 cr0_guest_host_mask;
	u64 cr4_guest_host_mask;
	u64 cr0_read_shadow;
	u64 cr4_read_shadow;
	u64 guest_cr0;
	u64 guest_cr3;
	u64 guest_cr4;
	u64 guest_dr7;

	u64 host_fs_base;
	u64 host_gs_base;
	u64 host_tr_base;
	u64 host_gdtr_base;
	u64 host_idtr_base;
	u64 host_rsp;

	u64 ept_pointer;

	u16 virtual_processor_id;
	u16 padding16_2[3];

	u64 padding64_2[5];
	u64 guest_physical_address;

	u32 vm_instruction_error;
	u32 vm_exit_reason;
	u32 vm_exit_intr_info;
	u32 vm_exit_intr_error_code;
	u32 idt_vectoring_info_field;
	u32 idt_vectoring_error_code;
	u32 vm_exit_instruction_len;
	u32 vmx_instruction_info;

	u64 exit_qualification;
	u64 exit_io_instruction_ecx;
	u64 exit_io_instruction_esi;
	u64 exit_io_instruction_edi;
	u64 exit_io_instruction_eip;

	u64 guest_linear_address;
	u64 guest_rsp;
	u64 guest_rflags;

	u32 guest_interruptibility_info;
	u32 cpu_based_vm_exec_control;
	u32 exception_bitmap;
	u32 vm_entry_controls;
	u32 vm_entry_intr_info_field;
	u32 vm_entry_exception_error_code;
	u32 vm_entry_instruction_len;
	u32 tpr_threshold;

	u64 guest_rip;

	u32 hv_clean_fields;
	u32 padding32_1;
	u32 hv_synthetic_controls;
	struct {
		u32 nested_flush_hypercall:1;
		u32 msr_bitmap:1;
		u32 reserved:30;
	}  __packed hv_enlightenments_control;
	u32 hv_vp_id;
	u32 padding32_2;
	u64 hv_vm_id;
	u64 partition_assist_page;
	u64 padding64_4[4];
	u64 guest_bndcfgs;
	u64 guest_ia32_perf_global_ctrl;
	u64 guest_ia32_s_cet;
	u64 guest_ssp;
	u64 guest_ia32_int_ssp_table_addr;
	u64 guest_ia32_lbr_ctl;
	u64 padding64_5[2];
	u64 xss_exit_bitmap;
	u64 encls_exiting_bitmap;
	u64 host_ia32_perf_global_ctrl;
	u64 tsc_multiplier;
	u64 host_ia32_s_cet;
	u64 host_ssp;
	u64 host_ia32_int_ssp_table_addr;
	u64 padding64_6;
} __packed;
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE			0


#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_IO_BITMAP		BIT(0)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP		BIT(1)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP2		BIT(2)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1		BIT(3)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_PROC		BIT(4)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_EVENT		BIT(5)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_ENTRY		BIT(6)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_EXCPN		BIT(7)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CRDR			BIT(8)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_XLAT		BIT(9)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC		BIT(10)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1		BIT(11)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2		BIT(12)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_POINTER		BIT(13)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_GRP1		BIT(14)
#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_ENLIGHTENMENTSCONTROL	BIT(15)

#define HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL			0xFFFF

/*
 * Note, Hyper-V isn't actually stealing bit 28 from Intel, just abusing it by
 * pairing it with architecturally impossible exit reasons.  Bit 28 is set only
 * on SMI exits to a SMI transfer monitor (STM) and if and only if a MTF VM-Exit
 * is pending.  I.e. it will never be set by hardware for non-SMI exits (there
 * are only three), nor will it ever be set unless the VMM is an STM.
 */
#define HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH		0x10000031

/*
 * Hyper-V uses the software reserved 32 bytes in VMCB control area to expose
 * SVM enlightenments to guests. This is documented in the TLFS doc.
 * Note on naming: SVM_NESTED_ENLIGHTENED_VMCB_FIELDS
 */
struct hv_vmcb_enlightenments {
	struct __packed hv_enlightenments_control {
		u32 nested_flush_hypercall : 1;
		u32 msr_bitmap : 1;
		u32 enlightened_npt_tlb: 1;
		u32 reserved : 29;
	} __packed hv_enlightenments_control;
	u32 hv_vp_id;
	u64 hv_vm_id;
	u64 partition_assist_page;
	u64 reserved;
} __packed;

/*
 * Hyper-V uses the software reserved clean bit in VMCB.
 */
#define HV_VMCB_NESTED_ENLIGHTENMENTS		31

/* Synthetic VM-Exit */
#define HV_SVM_EXITCODE_ENL			0xf0000000
#define HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH	(1)

/* VM_PARTITION_ASSIST_PAGE */
struct hv_partition_assist_pg {
	u32 tlb_lock_count;
};

/* Define connection identifier type. */
union hv_connection_id {
	u32 asu32;
	struct {
		u32 id : 24;
		u32 reserved : 8;
	} __packed u;
};

struct hv_input_unmap_gpa_pages {
	u64 target_partition_id;
	u64 target_gpa_base;
	u32 unmap_flags;
	u32 padding;
} __packed;

#endif /* #ifndef _HV_HVGDK_H */