LXR linux/arch/x86/kvm/vmx/evmcs.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __KVM_X86_VMX_EVMCS_H
   3#define __KVM_X86_VMX_EVMCS_H
   4
   5#include <linux/jump_label.h>
   6
   7#include <asm/hyperv-tlfs.h>
   8#include <asm/mshyperv.h>
   9#include <asm/vmx.h>
  10
  11#include "capabilities.h"
  12#include "vmcs.h"
  13
  14struct vmcs_config;
  15
  16DECLARE_STATIC_KEY_FALSE(enable_evmcs);
  17
  18#define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
  19
  20#define KVM_EVMCS_VERSION 1
  21
  22/*
  23 * Enlightened VMCSv1 doesn't support these:
  24 *
  25 *      POSTED_INTR_NV                  = 0x00000002,
  26 *      GUEST_INTR_STATUS               = 0x00000810,
  27 *      APIC_ACCESS_ADDR                = 0x00002014,
  28 *      POSTED_INTR_DESC_ADDR           = 0x00002016,
  29 *      EOI_EXIT_BITMAP0                = 0x0000201c,
  30 *      EOI_EXIT_BITMAP1                = 0x0000201e,
  31 *      EOI_EXIT_BITMAP2                = 0x00002020,
  32 *      EOI_EXIT_BITMAP3                = 0x00002022,
  33 *      GUEST_PML_INDEX                 = 0x00000812,
  34 *      PML_ADDRESS                     = 0x0000200e,
  35 *      VM_FUNCTION_CONTROL             = 0x00002018,
  36 *      EPTP_LIST_ADDRESS               = 0x00002024,
  37 *      VMREAD_BITMAP                   = 0x00002026,
  38 *      VMWRITE_BITMAP                  = 0x00002028,
  39 *
  40 *      TSC_MULTIPLIER                  = 0x00002032,
  41 *      PLE_GAP                         = 0x00004020,
  42 *      PLE_WINDOW                      = 0x00004022,
  43 *      VMX_PREEMPTION_TIMER_VALUE      = 0x0000482E,
  44 *      GUEST_IA32_PERF_GLOBAL_CTRL     = 0x00002808,
  45 *      HOST_IA32_PERF_GLOBAL_CTRL      = 0x00002c04,
  46 *
  47 * Currently unsupported in KVM:
  48 *      GUEST_IA32_RTIT_CTL             = 0x00002814,
  49 */
  50#define EVMCS1_UNSUPPORTED_PINCTRL (PIN_BASED_POSTED_INTR | \
  51                                    PIN_BASED_VMX_PREEMPTION_TIMER)
  52#define EVMCS1_UNSUPPORTED_2NDEXEC                                      \
  53        (SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |                         \
  54         SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |                      \
  55         SECONDARY_EXEC_APIC_REGISTER_VIRT |                            \
  56         SECONDARY_EXEC_ENABLE_PML |                                    \
  57         SECONDARY_EXEC_ENABLE_VMFUNC |                                 \
  58         SECONDARY_EXEC_SHADOW_VMCS |                                   \
  59         SECONDARY_EXEC_TSC_SCALING |                                   \
  60         SECONDARY_EXEC_PAUSE_LOOP_EXITING)
  61#define EVMCS1_UNSUPPORTED_VMEXIT_CTRL (VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
  62#define EVMCS1_UNSUPPORTED_VMENTRY_CTRL (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
  63#define EVMCS1_UNSUPPORTED_VMFUNC (VMX_VMFUNC_EPTP_SWITCHING)
  64
  65#if IS_ENABLED(CONFIG_HYPERV)
  66
  67struct evmcs_field {
  68        u16 offset;
  69        u16 clean_field;
  70};
  71
  72extern const struct evmcs_field vmcs_field_to_evmcs_1[];
  73extern const unsigned int nr_evmcs_1_fields;
  74
  75#define ROL16(val, n) ((u16)(((u16)(val) << (n)) | ((u16)(val) >> (16 - (n)))))
  76
  77static __always_inline int get_evmcs_offset(unsigned long field,
  78                                            u16 *clean_field)
  79{
  80        unsigned int index = ROL16(field, 6);
  81        const struct evmcs_field *evmcs_field;
  82
  83        if (unlikely(index >= nr_evmcs_1_fields)) {
  84                WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
  85                          field);
  86                return -ENOENT;
  87        }
  88
  89        evmcs_field = &vmcs_field_to_evmcs_1[index];
  90
  91        if (clean_field)
  92                *clean_field = evmcs_field->clean_field;
  93
  94        return evmcs_field->offset;
  95}
  96
  97#undef ROL16
  98
  99static inline void evmcs_write64(unsigned long field, u64 value)
 100{
 101        u16 clean_field;
 102        int offset = get_evmcs_offset(field, &clean_field);
 103
 104        if (offset < 0)
 105                return;
 106
 107        *(u64 *)((char *)current_evmcs + offset) = value;
 108
 109        current_evmcs->hv_clean_fields &= ~clean_field;
 110}
 111
 112static inline void evmcs_write32(unsigned long field, u32 value)
 113{
 114        u16 clean_field;
 115        int offset = get_evmcs_offset(field, &clean_field);
 116
 117        if (offset < 0)
 118                return;
 119
 120        *(u32 *)((char *)current_evmcs + offset) = value;
 121        current_evmcs->hv_clean_fields &= ~clean_field;
 122}
 123
 124static inline void evmcs_write16(unsigned long field, u16 value)
 125{
 126        u16 clean_field;
 127        int offset = get_evmcs_offset(field, &clean_field);
 128
 129        if (offset < 0)
 130                return;
 131
 132        *(u16 *)((char *)current_evmcs + offset) = value;
 133        current_evmcs->hv_clean_fields &= ~clean_field;
 134}
 135
 136static inline u64 evmcs_read64(unsigned long field)
 137{
 138        int offset = get_evmcs_offset(field, NULL);
 139
 140        if (offset < 0)
 141                return 0;
 142
 143        return *(u64 *)((char *)current_evmcs + offset);
 144}
 145
 146static inline u32 evmcs_read32(unsigned long field)
 147{
 148        int offset = get_evmcs_offset(field, NULL);
 149
 150        if (offset < 0)
 151                return 0;
 152
 153        return *(u32 *)((char *)current_evmcs + offset);
 154}
 155
 156static inline u16 evmcs_read16(unsigned long field)
 157{
 158        int offset = get_evmcs_offset(field, NULL);
 159
 160        if (offset < 0)
 161                return 0;
 162
 163        return *(u16 *)((char *)current_evmcs + offset);
 164}
 165
 166static inline void evmcs_touch_msr_bitmap(void)
 167{
 168        if (unlikely(!current_evmcs))
 169                return;
 170
 171        if (current_evmcs->hv_enlightenments_control.msr_bitmap)
 172                current_evmcs->hv_clean_fields &=
 173                        ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
 174}
 175
 176static inline void evmcs_load(u64 phys_addr)
 177{
 178        struct hv_vp_assist_page *vp_ap =
 179                hv_get_vp_assist_page(smp_processor_id());
 180
 181        vp_ap->current_nested_vmcs = phys_addr;
 182        vp_ap->enlighten_vmentry = 1;
 183}
 184
 185void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
 186#else /* !IS_ENABLED(CONFIG_HYPERV) */
 187static inline void evmcs_write64(unsigned long field, u64 value) {}
 188static inline void evmcs_write32(unsigned long field, u32 value) {}
 189static inline void evmcs_write16(unsigned long field, u16 value) {}
 190static inline u64 evmcs_read64(unsigned long field) { return 0; }
 191static inline u32 evmcs_read32(unsigned long field) { return 0; }
 192static inline u16 evmcs_read16(unsigned long field) { return 0; }
 193static inline void evmcs_load(u64 phys_addr) {}
 194static inline void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf) {}
 195static inline void evmcs_touch_msr_bitmap(void) {}
 196#endif /* IS_ENABLED(CONFIG_HYPERV) */
 197
 198bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa);
 199uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu);
 200int nested_enable_evmcs(struct kvm_vcpu *vcpu,
 201                        uint16_t *vmcs_version);
 202
 203#endif /* __KVM_X86_VMX_EVMCS_H */
 204