arch/x86/kvm/vmx/vmx_onhyperv.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef __ARCH_X86_KVM_VMX_ONHYPERV_H__
   4 #define __ARCH_X86_KVM_VMX_ONHYPERV_H__
   5
   6 #include <asm/hyperv-tlfs.h>
   7 #include <asm/mshyperv.h>
   8
   9 #include <linux/jump_label.h>
  10
  11 #include "capabilities.h"
  12 #include "hyperv_evmcs.h"
  13 #include "vmcs12.h"
  14
  15 #define current_evmcs ((struct hv_enlightened_vmcs *)this_cpu_read(current_vmcs))
  16
  17 #if IS_ENABLED(CONFIG_HYPERV)
  18
  19 DECLARE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
  20
  21 static __always_inline bool kvm_is_using_evmcs(void)
  22 {
  23         return static_branch_unlikely(&__kvm_is_using_evmcs);
  24 }
  25
  26 static __always_inline int get_evmcs_offset(unsigned long field,
  27                                             u16 *clean_field)
  28 {
  29         int offset = evmcs_field_offset(field, clean_field);
  30
  31         WARN_ONCE(offset < 0, "accessing unsupported EVMCS field %lx\n", field);
  32         return offset;
  33 }
  34
  35 static __always_inline void evmcs_write64(unsigned long field, u64 value)
  36 {
  37         u16 clean_field;
  38         int offset = get_evmcs_offset(field, &clean_field);
  39
  40         if (offset < 0)
  41                 return;
  42
  43         *(u64 *)((char *)current_evmcs + offset) = value;
  44
  45         current_evmcs->hv_clean_fields &= ~clean_field;
  46 }
  47
  48 static __always_inline void evmcs_write32(unsigned long field, u32 value)
  49 {
  50         u16 clean_field;
  51         int offset = get_evmcs_offset(field, &clean_field);
  52
  53         if (offset < 0)
  54                 return;
  55
  56         *(u32 *)((char *)current_evmcs + offset) = value;
  57         current_evmcs->hv_clean_fields &= ~clean_field;
  58 }
  59
  60 static __always_inline void evmcs_write16(unsigned long field, u16 value)
  61 {
  62         u16 clean_field;
  63         int offset = get_evmcs_offset(field, &clean_field);
  64
  65         if (offset < 0)
  66                 return;
  67
  68         *(u16 *)((char *)current_evmcs + offset) = value;
  69         current_evmcs->hv_clean_fields &= ~clean_field;
  70 }
  71
  72 static __always_inline u64 evmcs_read64(unsigned long field)
  73 {
  74         int offset = get_evmcs_offset(field, NULL);
  75
  76         if (offset < 0)
  77                 return 0;
  78
  79         return *(u64 *)((char *)current_evmcs + offset);
  80 }
  81
  82 static __always_inline u32 evmcs_read32(unsigned long field)
  83 {
  84         int offset = get_evmcs_offset(field, NULL);
  85
  86         if (offset < 0)
  87                 return 0;
  88
  89         return *(u32 *)((char *)current_evmcs + offset);
  90 }
  91
  92 static __always_inline u16 evmcs_read16(unsigned long field)
  93 {
  94         int offset = get_evmcs_offset(field, NULL);
  95
  96         if (offset < 0)
  97                 return 0;
  98
  99         return *(u16 *)((char *)current_evmcs + offset);
 100 }
 101
 102 static inline void evmcs_load(u64 phys_addr)
 103 {
 104         struct hv_vp_assist_page *vp_ap =
 105                 hv_get_vp_assist_page(smp_processor_id());
 106
 107         /*
 108          * When enabling eVMCS, KVM verifies that every CPU has a valid hv_vp_assist_page()
 109          * and aborts enabling the feature otherwise. CPU onlining path is also checked in
 110          * vmx_hardware_enable().
 111          */
 112         if (KVM_BUG_ON(!vp_ap, kvm_get_running_vcpu()->kvm))
 113                 return;
 114
 115         if (current_evmcs->hv_enlightenments_control.nested_flush_hypercall)
 116                 vp_ap->nested_control.features.directhypercall = 1;
 117         vp_ap->current_nested_vmcs = phys_addr;
 118         vp_ap->enlighten_vmentry = 1;
 119 }
 120
 121 void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf);
 122 #else /* !IS_ENABLED(CONFIG_HYPERV) */
 123 static __always_inline bool kvm_is_using_evmcs(void) { return false; }
 124 static __always_inline void evmcs_write64(unsigned long field, u64 value) {}
 125 static __always_inline void evmcs_write32(unsigned long field, u32 value) {}
 126 static __always_inline void evmcs_write16(unsigned long field, u16 value) {}
 127 static __always_inline u64 evmcs_read64(unsigned long field) { return 0; }
 128 static __always_inline u32 evmcs_read32(unsigned long field) { return 0; }
 129 static __always_inline u16 evmcs_read16(unsigned long field) { return 0; }
 130 static inline void evmcs_load(u64 phys_addr) {}
 131 #endif /* IS_ENABLED(CONFIG_HYPERV) */
 132
 133 #endif /* __ARCH_X86_KVM_VMX_ONHYPERV_H__ */