1 #ifndef _ASM_X86_KVM_PARA_H 2 #define _ASM_X86_KVM_PARA_H 3 4 #include <asm/processor.h> 5 #include <uapi/asm/kvm_para.h> 6 7 extern void kvmclock_init(void); 8 extern int kvm_register_clock(char *txt); 9 10 #ifdef CONFIG_KVM_GUEST 11 bool kvm_check_and_clear_guest_paused(void); 12 #else 13 static inline bool kvm_check_and_clear_guest_paused(void) 14 { 15 return false; 16 } 17 #endif /* CONFIG_KVM_GUEST */ 18 19 /* This instruction is vmcall. On non-VT architectures, it will generate a 20 * trap that we will then rewrite to the appropriate instruction. 21 */ 22 #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1" 23 24 /* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall 25 * instruction. The hypervisor may replace it with something else but only the 26 * instructions are guaranteed to be supported. 27 * 28 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively. 29 * The hypercall number should be placed in rax and the return value will be 30 * placed in rax. No other registers will be clobbered unless explicitly 31 * noted by the particular hypercall. 32 */ 33 34 static inline long kvm_hypercall0(unsigned int nr) 35 { 36 long ret; 37 asm volatile(KVM_HYPERCALL 38 : "=a"(ret) 39 : "a"(nr) 40 : "memory"); 41 return ret; 42 } 43 44 static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) 45 { 46 long ret; 47 asm volatile(KVM_HYPERCALL 48 : "=a"(ret) 49 : "a"(nr), "b"(p1) 50 : "memory"); 51 return ret; 52 } 53 54 static inline long kvm_hypercall2(unsigned int nr, unsigned long p1, 55 unsigned long p2) 56 { 57 long ret; 58 asm volatile(KVM_HYPERCALL 59 : "=a"(ret) 60 : "a"(nr), "b"(p1), "c"(p2) 61 : "memory"); 62 return ret; 63 } 64 65 static inline long kvm_hypercall3(unsigned int nr, unsigned long p1, 66 unsigned long p2, unsigned long p3) 67 { 68 long ret; 69 asm volatile(KVM_HYPERCALL 70 : "=a"(ret) 71 : "a"(nr), "b"(p1), "c"(p2), "d"(p3) 72 : "memory"); 73 return ret; 74 } 75 76 static inline long kvm_hypercall4(unsigned int nr, unsigned long p1, 77 unsigned long p2, unsigned long p3, 78 unsigned long p4) 79 { 80 long ret; 81 asm volatile(KVM_HYPERCALL 82 : "=a"(ret) 83 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4) 84 : "memory"); 85 return ret; 86 } 87 88 static inline uint32_t kvm_cpuid_base(void) 89 { 90 if (boot_cpu_data.cpuid_level < 0) 91 return 0; /* So we don't blow up on old processors */ 92 93 if (cpu_has_hypervisor) 94 return hypervisor_cpuid_base("KVMKVMKVM\0\0\0", 0); 95 96 return 0; 97 } 98 99 static inline bool kvm_para_available(void) 100 { 101 return kvm_cpuid_base() != 0; 102 } 103 104 static inline unsigned int kvm_arch_para_features(void) 105 { 106 return cpuid_eax(KVM_CPUID_FEATURES); 107 } 108 109 #ifdef CONFIG_KVM_GUEST 110 void __init kvm_guest_init(void); 111 void kvm_async_pf_task_wait(u32 token); 112 void kvm_async_pf_task_wake(u32 token); 113 u32 kvm_read_and_reset_pf_reason(void); 114 extern void kvm_disable_steal_time(void); 115 116 #ifdef CONFIG_PARAVIRT_SPINLOCKS 117 void __init kvm_spinlock_init(void); 118 #else /* !CONFIG_PARAVIRT_SPINLOCKS */ 119 static inline void kvm_spinlock_init(void) 120 { 121 } 122 #endif /* CONFIG_PARAVIRT_SPINLOCKS */ 123 124 #else /* CONFIG_KVM_GUEST */ 125 #define kvm_guest_init() do {} while (0) 126 #define kvm_async_pf_task_wait(T) do {} while(0) 127 #define kvm_async_pf_task_wake(T) do {} while(0) 128 129 static inline u32 kvm_read_and_reset_pf_reason(void) 130 { 131 return 0; 132 } 133 134 static inline void kvm_disable_steal_time(void) 135 { 136 return; 137 } 138 #endif 139 140 #endif /* _ASM_X86_KVM_PARA_H */ 141