path: root/arch/x86/kvm/vmx/vmcs12.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_VMX_VMCS12_H
#define __KVM_X86_VMX_VMCS12_H

#include <linux/build_bug.h>

#include "vmcs.h"

/*
 * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a
 * single nested guest (L2), hence the name vmcs12. Any VMX implementation has
 * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is
 * stored in guest memory specified by VMPTRLD, but is opaque to the guest,
 * which must access it using VMREAD/VMWRITE/VMCLEAR instructions.
 * More than one of these structures may exist, if L1 runs multiple L2 guests.
 * nested_vmx_run() will use the data here to build the vmcs02: a VMCS for the
 * underlying hardware which will be used to run L2.
 * This structure is packed to ensure that its layout is identical across
 * machines (necessary for live migration).
 *
 * IMPORTANT: Changing the layout of existing fields in this structure
 * will break save/restore compatibility with older kvm releases. When
 * adding new fields, either use space in the reserved padding* arrays
 * or add the new fields to the end of the structure.
 */
typedef u64 natural_width;
struct __packed vmcs12 {
	/* According to the Intel spec, a VMCS region must start with the
	 * following two fields. Then follow implementation-specific data.
	 */
	struct vmcs_hdr hdr;
	u32 abort;

	u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
	u32 padding[7]; /* room for future expansion */

	u64 io_bitmap_a;
	u64 io_bitmap_b;
	u64 msr_bitmap;
	u64 vm_exit_msr_store_addr;
	u64 vm_exit_msr_load_addr;
	u64 vm_entry_msr_load_addr;
	u64 tsc_offset;
	u64 virtual_apic_page_addr;
	u64 apic_access_addr;
	u64 posted_intr_desc_addr;
	u64 ept_pointer;
	u64 eoi_exit_bitmap0;
	u64 eoi_exit_bitmap1;
	u64 eoi_exit_bitmap2;
	u64 eoi_exit_bitmap3;
	u64 xss_exit_bitmap;
	u64 guest_physical_address;
	u64 vmcs_link_pointer;
	u64 guest_ia32_debugctl;
	u64 guest_ia32_pat;
	u64 guest_ia32_efer;
	u64 guest_ia32_perf_global_ctrl;
	u64 guest_pdptr0;
	u64 guest_pdptr1;
	u64 guest_pdptr2;
	u64 guest_pdptr3;
	u64 guest_bndcfgs;
	u64 host_ia32_pat;
	u64 host_ia32_efer;
	u64 host_ia32_perf_global_ctrl;
	u64 vmread_bitmap;
	u64 vmwrite_bitmap;
	u64 vm_function_control;
	u64 eptp_list_address;
	u64 pml_address;
	u64 padding64[3]; /* room for future expansion */
	/*
	 * To allow migration of L1 (complete with its L2 guests) between
	 * machines of different natural widths (32 or 64 bit), we cannot have
	 * unsigned long fields with no explicit size. We use u64 (aliased
	 * natural_width) instead. Luckily, x86 is little-endian.
	 */
	natural_width cr0_guest_host_mask;
	natural_width cr4_guest_host_mask;
	natural_width cr0_read_shadow;
	natural_width cr4_read_shadow;
	natural_width cr3_target_value0;
	natural_width cr3_target_value1;
	natural_width cr3_target_value2;
	natural_width cr3_target_value3;
	natural_width exit_qualification;
	natural_width guest_linear_address;
	natural_width guest_cr0;
	natural_width guest_cr3;
	natural_width guest_cr4;
	natural_width guest_es_base;
	natural_width guest_cs_base;
	natural_width guest_ss_base;
	natural_width guest_ds_base;
	natural_width guest_fs_base;
	natural_width guest_gs_base;
	natural_width guest_ldtr_base;
	natural_width guest_tr_base;
	natural_width guest_gdtr_base;
	natural_width guest_idtr_base;
	natural_width guest_dr7;
	natural_width guest_rsp;
	natural_width guest_rip;
	natural_width guest_rflags;
	natural_width guest_pending_dbg_exceptions;
	natural_width guest_sysenter_esp;
	natural_width guest_sysenter_eip;
	natural_width host_cr0;
	natural_width host_cr3;
	natural_width host_cr4;
	natural_width host_fs_base;
	natural_width host_gs_base;
	natural_width host_tr_base;
	natural_width host_gdtr_base;
	natural_width host_idtr_base;
	natural_width host_ia32_sysenter_esp;
	natural_width host_ia32_sysenter_eip;
	natural_width host_rsp;
	natural_width host_rip;
	natural_width paddingl[8]; /* room for future expansion */
	u32 pin_based_vm_exec_control;
	u32 cpu_based_vm_exec_control;
	u32 exception_bitmap;
	u32 page_fault_error_code_mask;
	u32 page_fault_error_code_match;
	u32 cr3_target_count;
	u32 vm_exit_controls;
	u32 vm_exit_msr_store_count;
	u32 vm_exit_msr_load_count;
	u32 vm_entry_controls;
	u32 vm_entry_msr_load_count;
	u32 vm_entry_intr_info_field;
	u32 vm_entry_exception_error_code;
	u32 vm_entry_instruction_len;
	u32 tpr_threshold;
	u32 secondary_vm_exec_control;
	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;
	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;
	u32 guest_interruptibility_info;
	u32 guest_activity_state;
	u32 guest_sysenter_cs;
	u32 host_ia32_sysenter_cs;
	u32 vmx_preemption_timer_value;
	u32 padding32[7]; /* room for future expansion */
	u16 virtual_processor_id;
	u16 posted_intr_nv;
	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;
	u16 guest_intr_status;
	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 guest_pml_index;
};

/*
 * VMCS12_REVISION is an arbitrary id that should be changed if the content or
 * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
 * VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
 *
 * IMPORTANT: Changing this value will break save/restore compatibility with
 * older kvm releases.
 */
#define VMCS12_REVISION 0x11e57ed0

/*
 * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
 * and any VMCS region. Although only sizeof(struct vmcs12) are used by the
 * current implementation, 4K are reserved to avoid future complications and
 * to preserve userspace ABI.
 */
#define VMCS12_SIZE		KVM_STATE_NESTED_VMX_VMCS_SIZE

/*
 * VMCS12_MAX_FIELD_INDEX is the highest index value used in any
 * supported VMCS12 field encoding.
 */
#define VMCS12_MAX_FIELD_INDEX 0x17

/*
 * For save/restore compatibility, the vmcs12 field offsets must not change.
 */
#define CHECK_OFFSET(field, loc)				\
	BUILD_BUG_ON_MSG(offsetof(struct vmcs12, field) != (loc),	\
		"Offset of " #field " in struct vmcs12 has changed.")

static inline void vmx_check_vmcs12_offsets(void)
{
	CHECK_OFFSET(hdr, 0);
	CHECK_OFFSET(abort, 4);
	CHECK_OFFSET(launch_state, 8);
	CHECK_OFFSET(io_bitmap_a, 40);
	CHECK_OFFSET(io_bitmap_b, 48);
	CHECK_OFFSET(msr_bitmap, 56);
	CHECK_OFFSET(vm_exit_msr_store_addr, 64);
	CHECK_OFFSET(vm_exit_msr_load_addr, 72);
	CHECK_OFFSET(vm_entry_msr_load_addr, 80);
	CHECK_OFFSET(tsc_offset, 88);
	CHECK_OFFSET(virtual_apic_page_addr, 96);
	CHECK_OFFSET(apic_access_addr, 104);
	CHECK_OFFSET(posted_intr_desc_addr, 112);
	CHECK_OFFSET(ept_pointer, 120);
	CHECK_OFFSET(eoi_exit_bitmap0, 128);
	CHECK_OFFSET(eoi_exit_bitmap1, 136);
	CHECK_OFFSET(eoi_exit_bitmap2, 144);
	CHECK_OFFSET(eoi_exit_bitmap3, 152);
	CHECK_OFFSET(xss_exit_bitmap, 160);
	CHECK_OFFSET(guest_physical_address, 168);
	CHECK_OFFSET(vmcs_link_pointer, 176);
	CHECK_OFFSET(guest_ia32_debugctl, 184);
	CHECK_OFFSET(guest_ia32_pat, 192);
	CHECK_OFFSET(guest_ia32_efer, 200);
	CHECK_OFFSET(guest_ia32_perf_global_ctrl, 208);
	CHECK_OFFSET(guest_pdptr0, 216);
	CHECK_OFFSET(guest_pdptr1, 224);
	CHECK_OFFSET(guest_pdptr2, 232);
	CHECK_OFFSET(guest_pdptr3, 240);
	CHECK_OFFSET(guest_bndcfgs, 248);
	CHECK_OFFSET(host_ia32_pat, 256);
	CHECK_OFFSET(host_ia32_efer, 264);
	CHECK_OFFSET(host_ia32_perf_global_ctrl, 272);
	CHECK_OFFSET(vmread_bitmap, 280);
	CHECK_OFFSET(vmwrite_bitmap, 288);
	CHECK_OFFSET(vm_function_control, 296);
	CHECK_OFFSET(eptp_list_address, 304);
	CHECK_OFFSET(pml_address, 312);
	CHECK_OFFSET(cr0_guest_host_mask, 344);
	CHECK_OFFSET(cr4_guest_host_mask, 352);
	CHECK_OFFSET(cr0_read_shadow, 360);
	CHECK_OFFSET(cr4_read_shadow, 368);
	CHECK_OFFSET(cr3_target_value0, 376);
	CHECK_OFFSET(cr3_target_value1, 384);
	CHECK_OFFSET(cr3_target_value2, 392);
	CHECK_OFFSET(cr3_target_value3, 400);
	CHECK_OFFSET(exit_qualification, 408);
	CHECK_OFFSET(guest_linear_address, 416);
	CHECK_OFFSET(guest_cr0, 424);
	CHECK_OFFSET(guest_cr3, 432);
	CHECK_OFFSET(guest_cr4, 440);
	CHECK_OFFSET(guest_es_base, 448);
	CHECK_OFFSET(guest_cs_base, 456);
	CHECK_OFFSET(guest_ss_base, 464);
	CHECK_OFFSET(guest_ds_base, 472);
	CHECK_OFFSET(guest_fs_base, 480);
	CHECK_OFFSET(guest_gs_base, 488);
	CHECK_OFFSET(guest_ldtr_base, 496);
	CHECK_OFFSET(guest_tr_base, 504);
	CHECK_OFFSET(guest_gdtr_base, 512);
	CHECK_OFFSET(guest_idtr_base, 520);
	CHECK_OFFSET(guest_dr7, 528);
	CHECK_OFFSET(guest_rsp, 536);
	CHECK_OFFSET(guest_rip, 544);
	CHECK_OFFSET(guest_rflags, 552);
	CHECK_OFFSET(guest_pending_dbg_exceptions, 560);
	CHECK_OFFSET(guest_sysenter_esp, 568);
	CHECK_OFFSET(guest_sysenter_eip, 576);
	CHECK_OFFSET(host_cr0, 584);
	CHECK_OFFSET(host_cr3, 592);
	CHECK_OFFSET(host_cr4, 600);
	CHECK_OFFSET(host_fs_base, 608);
	CHECK_OFFSET(host_gs_base, 616);
	CHECK_OFFSET(host_tr_base, 624);
	CHECK_OFFSET(host_gdtr_base, 632);
	CHECK_OFFSET(host_idtr_base, 640);
	CHECK_OFFSET(host_ia32_sysenter_esp, 648);
	CHECK_OFFSET(host_ia32_sysenter_eip, 656);
	CHECK_OFFSET(host_rsp, 664);
	CHECK_OFFSET(host_rip, 672);
	CHECK_OFFSET(pin_based_vm_exec_control, 744);
	CHECK_OFFSET(cpu_based_vm_exec_control, 748);
	CHECK_OFFSET(exception_bitmap, 752);
	CHECK_OFFSET(page_fault_error_code_mask, 756);
	CHECK_OFFSET(page_fault_error_code_match, 760);
	CHECK_OFFSET(cr3_target_count, 764);
	CHECK_OFFSET(vm_exit_controls, 768);
	CHECK_OFFSET(vm_exit_msr_store_count, 772);
	CHECK_OFFSET(vm_exit_msr_load_count, 776);
	CHECK_OFFSET(vm_entry_controls, 780);
	CHECK_OFFSET(vm_entry_msr_load_count, 784);
	CHECK_OFFSET(vm_entry_intr_info_field, 788);
	CHECK_OFFSET(vm_entry_exception_error_code, 792);
	CHECK_OFFSET(vm_entry_instruction_len, 796);
	CHECK_OFFSET(tpr_threshold, 800);
	CHECK_OFFSET(secondary_vm_exec_control, 804);
	CHECK_OFFSET(vm_instruction_error, 808);
	CHECK_OFFSET(vm_exit_reason, 812);
	CHECK_OFFSET(vm_exit_intr_info, 816);
	CHECK_OFFSET(vm_exit_intr_error_code, 820);
	CHECK_OFFSET(idt_vectoring_info_field, 824);
	CHECK_OFFSET(idt_vectoring_error_code, 828);
	CHECK_OFFSET(vm_exit_instruction_len, 832);
	CHECK_OFFSET(vmx_instruction_info, 836);
	CHECK_OFFSET(guest_es_limit, 840);
	CHECK_OFFSET(guest_cs_limit, 844);
	CHECK_OFFSET(guest_ss_limit, 848);
	CHECK_OFFSET(guest_ds_limit, 852);
	CHECK_OFFSET(guest_fs_limit, 856);
	CHECK_OFFSET(guest_gs_limit, 860);
	CHECK_OFFSET(guest_ldtr_limit, 864);
	CHECK_OFFSET(guest_tr_limit, 868);
	CHECK_OFFSET(guest_gdtr_limit, 872);
	CHECK_OFFSET(guest_idtr_limit, 876);
	CHECK_OFFSET(guest_es_ar_bytes, 880);
	CHECK_OFFSET(guest_cs_ar_bytes, 884);
	CHECK_OFFSET(guest_ss_ar_bytes, 888);
	CHECK_OFFSET(guest_ds_ar_bytes, 892);
	CHECK_OFFSET(guest_fs_ar_bytes, 896);
	CHECK_OFFSET(guest_gs_ar_bytes, 900);
	CHECK_OFFSET(guest_ldtr_ar_bytes, 904);
	CHECK_OFFSET(guest_tr_ar_bytes, 908);
	CHECK_OFFSET(guest_interruptibility_info, 912);
	CHECK_OFFSET(guest_activity_state, 916);
	CHECK_OFFSET(guest_sysenter_cs, 920);
	CHECK_OFFSET(host_ia32_sysenter_cs, 924);
	CHECK_OFFSET(vmx_preemption_timer_value, 928);
	CHECK_OFFSET(virtual_processor_id, 960);
	CHECK_OFFSET(posted_intr_nv, 962);
	CHECK_OFFSET(guest_es_selector, 964);
	CHECK_OFFSET(guest_cs_selector, 966);
	CHECK_OFFSET(guest_ss_selector, 968);
	CHECK_OFFSET(guest_ds_selector, 970);
	CHECK_OFFSET(guest_fs_selector, 972);
	CHECK_OFFSET(guest_gs_selector, 974);
	CHECK_OFFSET(guest_ldtr_selector, 976);
	CHECK_OFFSET(guest_tr_selector, 978);
	CHECK_OFFSET(guest_intr_status, 980);
	CHECK_OFFSET(host_es_selector, 982);
	CHECK_OFFSET(host_cs_selector, 984);
	CHECK_OFFSET(host_ss_selector, 986);
	CHECK_OFFSET(host_ds_selector, 988);
	CHECK_OFFSET(host_fs_selector, 990);
	CHECK_OFFSET(host_gs_selector, 992);
	CHECK_OFFSET(host_tr_selector, 994);
	CHECK_OFFSET(guest_pml_index, 996);
}

extern const unsigned short vmcs_field_to_offset_table[];
extern const unsigned int nr_vmcs12_fields;

#define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))

static inline short vmcs_field_to_offset(unsigned long field)
{
	unsigned short offset;
	unsigned int index;

	if (field >> 15)
		return -ENOENT;

	index = ROL16(field, 6);
	if (index >= nr_vmcs12_fields)
		return -ENOENT;

	index = array_index_nospec(index, nr_vmcs12_fields);
	offset = vmcs_field_to_offset_table[index];
	if (offset == 0)
		return -ENOENT;
	return offset;
}

#undef ROL16

/*
 * Read a vmcs12 field. Since these can have varying lengths and we return
 * one type, we chose the biggest type (u64) and zero-extend the return value
 * to that size. Note that the caller, handle_vmread, might need to use only
 * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of
 * 64-bit fields are to be returned).
 */
static inline int vmcs12_read_any(struct vmcs12 *vmcs12,
				  unsigned long field, u64 *ret)
{
	short offset = vmcs_field_to_offset(field);
	char *p;

	if (offset < 0)
		return offset;

	p = (char *)vmcs12 + offset;

	switch (vmcs_field_width(field)) {
	case VMCS_FIELD_WIDTH_NATURAL_WIDTH:
		*ret = *((natural_width *)p);
		return 0;
	case VMCS_FIELD_WIDTH_U16:
		*ret = *((u16 *)p);
		return 0;
	case VMCS_FIELD_WIDTH_U32:
		*ret = *((u32 *)p);
		return 0;
	case VMCS_FIELD_WIDTH_U64:
		*ret = *((u64 *)p);
		return 0;
	default:
		WARN_ON(1);
		return -ENOENT;
	}
}

static inline int vmcs12_write_any(struct vmcs12 *vmcs12,
				   unsigned long field, u64 field_value){
	short offset = vmcs_field_to_offset(field);
	char *p = (char *)vmcs12 + offset;

	if (offset < 0)
		return offset;

	switch (vmcs_field_width(field)) {
	case VMCS_FIELD_WIDTH_U16:
		*(u16 *)p = field_value;
		return 0;
	case VMCS_FIELD_WIDTH_U32:
		*(u32 *)p = field_value;
		return 0;
	case VMCS_FIELD_WIDTH_U64:
		*(u64 *)p = field_value;
		return 0;
	case VMCS_FIELD_WIDTH_NATURAL_WIDTH:
		*(natural_width *)p = field_value;
		return 0;
	default:
		WARN_ON(1);
		return -ENOENT;
	}

}

#endif /* __KVM_X86_VMX_VMCS12_H */