/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_VMX_H
#define __KVM_X86_VMX_H

#include <linux/kvm_host.h>

#include <asm/kvm.h>
#include <asm/intel_pt.h>

#include "capabilities.h"
#include "ops.h"
#include "vmcs.h"

extern const u32 vmx_msr_index[];
extern u64 host_efer;

#define MSR_TYPE_R      1
#define MSR_TYPE_W      2
#define MSR_TYPE_RW     3

#define X2APIC_MSR(r) (APIC_BASE_MSR + ((r) >> 4))

#define NR_AUTOLOAD_MSRS 8

struct vmx_msrs {
        unsigned int            nr;
        struct vmx_msr_entry    val[NR_AUTOLOAD_MSRS];
};

struct shared_msr_entry {
        unsigned index;
        u64 data;
        u64 mask;
};

enum segment_cache_field {
        SEG_FIELD_SEL = 0,
        SEG_FIELD_BASE = 1,
        SEG_FIELD_LIMIT = 2,
        SEG_FIELD_AR = 3,

        SEG_FIELD_NR = 4
};

/* Posted-Interrupt Descriptor */
struct pi_desc {
        u32 pir[8];     /* Posted interrupt requested */
        union {
                struct {
                                /* bit 256 - Outstanding Notification */
                        u16     on      : 1,
                                /* bit 257 - Suppress Notification */
                                sn      : 1,
                                /* bit 271:258 - Reserved */
                                rsvd_1  : 14;
                                /* bit 279:272 - Notification Vector */
                        u8      nv;
                                /* bit 287:280 - Reserved */
                        u8      rsvd_2;
                                /* bit 319:288 - Notification Destination */
                        u32     ndst;
                };
                u64 control;
        };
        u32 rsvd[6];
} __aligned(64);

#define RTIT_ADDR_RANGE         4

struct pt_ctx {
        u64 ctl;
        u64 status;
        u64 output_base;
        u64 output_mask;
        u64 cr3_match;
        u64 addr_a[RTIT_ADDR_RANGE];
        u64 addr_b[RTIT_ADDR_RANGE];
};

struct pt_desc {
        u64 ctl_bitmask;
        u32 addr_range;
        u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
        struct pt_ctx host;
        struct pt_ctx guest;
};

/*
 * The nested_vmx structure is part of vcpu_vmx, and holds information we need
 * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
 */
struct nested_vmx {
        /* Has the level1 guest done vmxon? */
        bool vmxon;
        gpa_t vmxon_ptr;
        bool pml_full;

        /* The guest-physical address of the current VMCS L1 keeps for L2 */
        gpa_t current_vmptr;
        /*
         * Cache of the guest's VMCS, existing outside of guest memory.
         * Loaded from guest memory during VMPTRLD. Flushed to guest
         * memory during VMCLEAR and VMPTRLD.
         */
        struct vmcs12 *cached_vmcs12;
        /*
         * Cache of the guest's shadow VMCS, existing outside of guest
         * memory. Loaded from guest memory during VM entry. Flushed
         * to guest memory during VM exit.
         */
        struct vmcs12 *cached_shadow_vmcs12;

        /*
         * Indicates if the shadow vmcs or enlightened vmcs must be updated
         * with the data held by struct vmcs12.
         */
        bool need_vmcs12_to_shadow_sync;
        bool dirty_vmcs12;

        /*
         * Indicates lazily loaded guest state has not yet been decached from
         * vmcs02.
         */
        bool need_sync_vmcs02_to_vmcs12_rare;

        /*
         * vmcs02 has been initialized, i.e. state that is constant for
         * vmcs02 has been written to the backing VMCS.  Initialization
         * is delayed until L1 actually attempts to run a nested VM.
         */
        bool vmcs02_initialized;

        bool change_vmcs01_virtual_apic_mode;

        /*
         * Enlightened VMCS has been enabled. It does not mean that L1 has to
         * use it. However, VMX features available to L1 will be limited based
         * on what the enlightened VMCS supports.
         */
        bool enlightened_vmcs_enabled;

        /* L2 must run next, and mustn't decide to exit to L1. */
        bool nested_run_pending;

        struct loaded_vmcs vmcs02;

        /*
         * Guest pages referred to in the vmcs02 with host-physical
         * pointers, so we must keep them pinned while L2 runs.
         */
        struct page *apic_access_page;
        struct kvm_host_map virtual_apic_map;
        struct kvm_host_map pi_desc_map;

        struct kvm_host_map msr_bitmap_map;

        struct pi_desc *pi_desc;
        bool pi_pending;
        u16 posted_intr_nv;

        struct hrtimer preemption_timer;
        bool preemption_timer_expired;

        /* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */
        u64 vmcs01_debugctl;
        u64 vmcs01_guest_bndcfgs;

        u16 vpid02;
        u16 last_vpid;

        struct nested_vmx_msrs msrs;

        /* SMM related state */
        struct {
                /* in VMX operation on SMM entry? */
                bool vmxon;
                /* in guest mode on SMM entry? */
                bool guest_mode;
        } smm;

        gpa_t hv_evmcs_vmptr;
        struct kvm_host_map hv_evmcs_map;
        struct hv_enlightened_vmcs *hv_evmcs;
};

struct vcpu_vmx {
        struct kvm_vcpu       vcpu;
        u8                    fail;
        u8                    msr_bitmap_mode;

        /*
         * If true, host state has been stored in vmx->loaded_vmcs for
         * the CPU registers that only need to be switched when transitioning
         * to/from the kernel, and the registers have been loaded with guest
         * values.  If false, host state is loaded in the CPU registers
         * and vmx->loaded_vmcs->host_state is invalid.
         */
        bool                  guest_state_loaded;

        u32                   exit_intr_info;
        u32                   idt_vectoring_info;
        ulong                 rflags;

        struct shared_msr_entry *guest_msrs;
        int                   nmsrs;
        int                   save_nmsrs;
        bool                  guest_msrs_ready;
#ifdef CONFIG_X86_64
        u64                   msr_host_kernel_gs_base;
        u64                   msr_guest_kernel_gs_base;
#endif

        u64                   spec_ctrl;

        u32 secondary_exec_control;

        /*
         * loaded_vmcs points to the VMCS currently used in this vcpu. For a
         * non-nested (L1) guest, it always points to vmcs01. For a nested
         * guest (L2), it points to a different VMCS.
         */
        struct loaded_vmcs    vmcs01;
        struct loaded_vmcs   *loaded_vmcs;

        struct msr_autoload {
                struct vmx_msrs guest;
                struct vmx_msrs host;
        } msr_autoload;

        struct {
                int vm86_active;
                ulong save_rflags;
                struct kvm_segment segs[8];
        } rmode;
        struct {
                u32 bitmask; /* 4 bits per segment (1 bit per field) */
                struct kvm_save_segment {
                        u16 selector;
                        unsigned long base;
                        u32 limit;
                        u32 ar;
                } seg[8];
        } segment_cache;
        int vpid;
        bool emulation_required;

        u32 exit_reason;

        /* Posted interrupt descriptor */
        struct pi_desc pi_desc;

        /* Support for a guest hypervisor (nested VMX) */
        struct nested_vmx nested;

        /* Dynamic PLE window. */
        int ple_window;
        bool ple_window_dirty;

        bool req_immediate_exit;

        /* Support for PML */
#define PML_ENTITY_NUM          512
        struct page *pml_pg;

        /* apic deadline value in host tsc */
        u64 hv_deadline_tsc;

        u64 current_tsc_ratio;

        u32 host_pkru;

        unsigned long host_debugctlmsr;

        /*
         * Only bits masked by msr_ia32_feature_control_valid_bits can be set in
         * msr_ia32_feature_control. FEATURE_CONTROL_LOCKED is always included
         * in msr_ia32_feature_control_valid_bits.
         */
        u64 msr_ia32_feature_control;
        u64 msr_ia32_feature_control_valid_bits;
        u64 ept_pointer;

        struct pt_desc pt_desc;
};

enum ept_pointers_status {
        EPT_POINTERS_CHECK = 0,
        EPT_POINTERS_MATCH = 1,
        EPT_POINTERS_MISMATCH = 2
};

struct kvm_vmx {
        struct kvm kvm;

        unsigned int tss_addr;
        bool ept_identity_pagetable_done;
        gpa_t ept_identity_map_addr;

        enum ept_pointers_status ept_pointers_match;
        spinlock_t ept_pointer_lock;
};

bool nested_vmx_allowed(struct kvm_vcpu *vcpu);
void vmx_vcpu_load_vmcs(struct kvm_vcpu *vcpu, int cpu);
void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
int allocate_vpid(void);
void free_vpid(int vpid);
void vmx_set_constant_host_state(struct vcpu_vmx *vmx);
void vmx_prepare_switch_to_guest(struct kvm_vcpu *vcpu);
void vmx_set_host_fs_gs(struct vmcs_host_state *host, u16 fs_sel, u16 gs_sel,
                        unsigned long fs_base, unsigned long gs_base);
int vmx_get_cpl(struct kvm_vcpu *vcpu);
unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu);
void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu);
void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask);
void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer);
void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
void set_cr4_guest_host_mask(struct vcpu_vmx *vmx);
void ept_save_pdptrs(struct kvm_vcpu *vcpu);
void vmx_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa);
void update_exception_bitmap(struct kvm_vcpu *vcpu);
void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu);
bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu);
void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);
void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr);
void pt_update_intercept_for_msr(struct vcpu_vmx *vmx);
void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp);

#define POSTED_INTR_ON  0
#define POSTED_INTR_SN  1

static inline bool pi_test_and_set_on(struct pi_desc *pi_desc)
{
        return test_and_set_bit(POSTED_INTR_ON,
                        (unsigned long *)&pi_desc->control);
}

static inline bool pi_test_and_clear_on(struct pi_desc *pi_desc)
{
        return test_and_clear_bit(POSTED_INTR_ON,
                        (unsigned long *)&pi_desc->control);
}

static inline int pi_test_and_set_pir(int vector, struct pi_desc *pi_desc)
{
        return test_and_set_bit(vector, (unsigned long *)pi_desc->pir);
}

static inline void pi_set_sn(struct pi_desc *pi_desc)
{
        set_bit(POSTED_INTR_SN,
                (unsigned long *)&pi_desc->control);
}

static inline void pi_set_on(struct pi_desc *pi_desc)
{
        set_bit(POSTED_INTR_ON,
                (unsigned long *)&pi_desc->control);
}

static inline void pi_clear_on(struct pi_desc *pi_desc)
{
        clear_bit(POSTED_INTR_ON,
                (unsigned long *)&pi_desc->control);
}

static inline int pi_test_on(struct pi_desc *pi_desc)
{
        return test_bit(POSTED_INTR_ON,
                        (unsigned long *)&pi_desc->control);
}

static inline int pi_test_sn(struct pi_desc *pi_desc)
{
        return test_bit(POSTED_INTR_SN,
                        (unsigned long *)&pi_desc->control);
}

static inline u8 vmx_get_rvi(void)
{
        return vmcs_read16(GUEST_INTR_STATUS) & 0xff;
}

#define BUILD_CONTROLS_SHADOW(lname, uname)                                 \
static inline void lname##_controls_set(struct vcpu_vmx *vmx, u32 val)      \
{                                                                           \
        if (vmx->loaded_vmcs->controls_shadow.lname != val) {               \
                vmcs_write32(uname, val);                                   \
                vmx->loaded_vmcs->controls_shadow.lname = val;              \
        }                                                                   \
}                                                                           \
static inline u32 lname##_controls_get(struct vcpu_vmx *vmx)                \
{                                                                           \
        return vmx->loaded_vmcs->controls_shadow.lname;                     \
}                                                                           \
static inline void lname##_controls_setbit(struct vcpu_vmx *vmx, u32 val)   \
{                                                                           \
        lname##_controls_set(vmx, lname##_controls_get(vmx) | val);         \
}                                                                           \
static inline void lname##_controls_clearbit(struct vcpu_vmx *vmx, u32 val) \
{                                                                           \
        lname##_controls_set(vmx, lname##_controls_get(vmx) & ~val);        \
}
BUILD_CONTROLS_SHADOW(vm_entry, VM_ENTRY_CONTROLS)
BUILD_CONTROLS_SHADOW(vm_exit, VM_EXIT_CONTROLS)
BUILD_CONTROLS_SHADOW(pin, PIN_BASED_VM_EXEC_CONTROL)
BUILD_CONTROLS_SHADOW(exec, CPU_BASED_VM_EXEC_CONTROL)
BUILD_CONTROLS_SHADOW(secondary_exec, SECONDARY_VM_EXEC_CONTROL)

static inline void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
{
        vmx->segment_cache.bitmask = 0;
}

static inline u32 vmx_vmentry_ctrl(void)
{
        u32 vmentry_ctrl = vmcs_config.vmentry_ctrl;
        if (pt_mode == PT_MODE_SYSTEM)
                vmentry_ctrl &= ~(VM_ENTRY_PT_CONCEAL_PIP |
                                  VM_ENTRY_LOAD_IA32_RTIT_CTL);
        /* Loading of EFER and PERF_GLOBAL_CTRL are toggled dynamically */
        return vmentry_ctrl &
                ~(VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL | VM_ENTRY_LOAD_IA32_EFER);
}

static inline u32 vmx_vmexit_ctrl(void)
{
        u32 vmexit_ctrl = vmcs_config.vmexit_ctrl;
        if (pt_mode == PT_MODE_SYSTEM)
                vmexit_ctrl &= ~(VM_EXIT_PT_CONCEAL_PIP |
                                 VM_EXIT_CLEAR_IA32_RTIT_CTL);
        /* Loading of EFER and PERF_GLOBAL_CTRL are toggled dynamically */
        return vmexit_ctrl &
                ~(VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL | VM_EXIT_LOAD_IA32_EFER);
}

u32 vmx_exec_control(struct vcpu_vmx *vmx);
u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx);

static inline struct kvm_vmx *to_kvm_vmx(struct kvm *kvm)
{
        return container_of(kvm, struct kvm_vmx, kvm);
}

static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
{
        return container_of(vcpu, struct vcpu_vmx, vcpu);
}

static inline struct pi_desc *vcpu_to_pi_desc(struct kvm_vcpu *vcpu)
{
        return &(to_vmx(vcpu)->pi_desc);
}

struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags);
void free_vmcs(struct vmcs *vmcs);
int alloc_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs);
void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs);
void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs);

static inline struct vmcs *alloc_vmcs(bool shadow)
{
        return alloc_vmcs_cpu(shadow, raw_smp_processor_id(),
                              GFP_KERNEL_ACCOUNT);
}

u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa);

static inline void __vmx_flush_tlb(struct kvm_vcpu *vcpu, int vpid,
                                bool invalidate_gpa)
{
        if (enable_ept && (invalidate_gpa || !enable_vpid)) {
                if (!VALID_PAGE(vcpu->arch.mmu->root_hpa))
                        return;
                ept_sync_context(construct_eptp(vcpu,
                                                vcpu->arch.mmu->root_hpa));
        } else {
                vpid_sync_context(vpid);
        }
}

static inline void vmx_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
{
        __vmx_flush_tlb(vcpu, to_vmx(vcpu)->vpid, invalidate_gpa);
}

static inline void decache_tsc_multiplier(struct vcpu_vmx *vmx)
{
        vmx->current_tsc_ratio = vmx->vcpu.arch.tsc_scaling_ratio;
        vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
}

void dump_vmcs(void);

#endif /* __KVM_X86_VMX_H */