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 explicited 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 int kvm_para_available(void) 89 { 90 unsigned int eax, ebx, ecx, edx; 91 char signature[13]; 92 93 if (boot_cpu_data.cpuid_level < 0) 94 return 0; /* So we don't blow up on old processors */ 95 96 if (cpu_has_hypervisor) { 97 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx); 98 memcpy(signature + 0, &ebx, 4); 99 memcpy(signature + 4, &ecx, 4); 100 memcpy(signature + 8, &edx, 4); 101 signature[12] = 0; 102 103 if (strcmp(signature, "KVMKVMKVM") == 0) 104 return 1; 105 } 106 107 return 0; 108 } 109 110 static inline unsigned int kvm_arch_para_features(void) 111 { 112 return cpuid_eax(KVM_CPUID_FEATURES); 113 } 114 115 #ifdef CONFIG_KVM_GUEST 116 void __init kvm_guest_init(void); 117 void kvm_async_pf_task_wait(u32 token); 118 void kvm_async_pf_task_wake(u32 token); 119 u32 kvm_read_and_reset_pf_reason(void); 120 extern void kvm_disable_steal_time(void); 121 #else 122 #define kvm_guest_init() do { } while (0) 123 #define kvm_async_pf_task_wait(T) do {} while(0) 124 #define kvm_async_pf_task_wake(T) do {} while(0) 125 static inline u32 kvm_read_and_reset_pf_reason(void) 126 { 127 return 0; 128 } 129 130 static inline void kvm_disable_steal_time(void) 131 { 132 return; 133 } 134 #endif 135 136 #endif /* _ASM_X86_KVM_PARA_H */ 137