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Linux/arch/x86/kvm/vmx/vmcs.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __KVM_X86_VMX_VMCS_H
  3 #define __KVM_X86_VMX_VMCS_H
  4 
  5 #include <linux/ktime.h>
  6 #include <linux/list.h>
  7 #include <linux/nospec.h>
  8 
  9 #include <asm/kvm.h>
 10 #include <asm/vmx.h>
 11 
 12 #include "capabilities.h"
 13 
 14 struct vmcs_hdr {
 15         u32 revision_id:31;
 16         u32 shadow_vmcs:1;
 17 };
 18 
 19 struct vmcs {
 20         struct vmcs_hdr hdr;
 21         u32 abort;
 22         char data[0];
 23 };
 24 
 25 DECLARE_PER_CPU(struct vmcs *, current_vmcs);
 26 
 27 /*
 28  * vmcs_host_state tracks registers that are loaded from the VMCS on VMEXIT
 29  * and whose values change infrequently, but are not constant.  I.e. this is
 30  * used as a write-through cache of the corresponding VMCS fields.
 31  */
 32 struct vmcs_host_state {
 33         unsigned long cr3;      /* May not match real cr3 */
 34         unsigned long cr4;      /* May not match real cr4 */
 35         unsigned long gs_base;
 36         unsigned long fs_base;
 37         unsigned long rsp;
 38 
 39         u16           fs_sel, gs_sel, ldt_sel;
 40 #ifdef CONFIG_X86_64
 41         u16           ds_sel, es_sel;
 42 #endif
 43 };
 44 
 45 /*
 46  * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also
 47  * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs
 48  * loaded on this CPU (so we can clear them if the CPU goes down).
 49  */
 50 struct loaded_vmcs {
 51         struct vmcs *vmcs;
 52         struct vmcs *shadow_vmcs;
 53         int cpu;
 54         bool launched;
 55         bool nmi_known_unmasked;
 56         bool hv_timer_armed;
 57         /* Support for vnmi-less CPUs */
 58         int soft_vnmi_blocked;
 59         ktime_t entry_time;
 60         s64 vnmi_blocked_time;
 61         unsigned long *msr_bitmap;
 62         struct list_head loaded_vmcss_on_cpu_link;
 63         struct vmcs_host_state host_state;
 64 };
 65 
 66 static inline bool is_exception_n(u32 intr_info, u8 vector)
 67 {
 68         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
 69                              INTR_INFO_VALID_MASK)) ==
 70                 (INTR_TYPE_HARD_EXCEPTION | vector | INTR_INFO_VALID_MASK);
 71 }
 72 
 73 static inline bool is_debug(u32 intr_info)
 74 {
 75         return is_exception_n(intr_info, DB_VECTOR);
 76 }
 77 
 78 static inline bool is_breakpoint(u32 intr_info)
 79 {
 80         return is_exception_n(intr_info, BP_VECTOR);
 81 }
 82 
 83 static inline bool is_page_fault(u32 intr_info)
 84 {
 85         return is_exception_n(intr_info, PF_VECTOR);
 86 }
 87 
 88 static inline bool is_invalid_opcode(u32 intr_info)
 89 {
 90         return is_exception_n(intr_info, UD_VECTOR);
 91 }
 92 
 93 static inline bool is_gp_fault(u32 intr_info)
 94 {
 95         return is_exception_n(intr_info, GP_VECTOR);
 96 }
 97 
 98 static inline bool is_machine_check(u32 intr_info)
 99 {
100         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
101                              INTR_INFO_VALID_MASK)) ==
102                 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
103 }
104 
105 /* Undocumented: icebp/int1 */
106 static inline bool is_icebp(u32 intr_info)
107 {
108         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
109                 == (INTR_TYPE_PRIV_SW_EXCEPTION | INTR_INFO_VALID_MASK);
110 }
111 
112 static inline bool is_nmi(u32 intr_info)
113 {
114         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
115                 == (INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK);
116 }
117 
118 enum vmcs_field_width {
119         VMCS_FIELD_WIDTH_U16 = 0,
120         VMCS_FIELD_WIDTH_U64 = 1,
121         VMCS_FIELD_WIDTH_U32 = 2,
122         VMCS_FIELD_WIDTH_NATURAL_WIDTH = 3
123 };
124 
125 static inline int vmcs_field_width(unsigned long field)
126 {
127         if (0x1 & field)        /* the *_HIGH fields are all 32 bit */
128                 return VMCS_FIELD_WIDTH_U32;
129         return (field >> 13) & 0x3;
130 }
131 
132 static inline int vmcs_field_readonly(unsigned long field)
133 {
134         return (((field >> 10) & 0x3) == 1);
135 }
136 
137 #endif /* __KVM_X86_VMX_VMCS_H */
138 

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