#ifndef __X86_KVM_PARA_H #define __X86_KVM_PARA_H /* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It * should be used to determine that a VM is running under KVM. */ #define KVM_CPUID_SIGNATURE 0x40000000 /* This CPUID returns a feature bitmap in eax. Before enabling a particular * paravirtualization, the appropriate feature bit should be checked. */ #define KVM_CPUID_FEATURES 0x40000001 #define KVM_FEATURE_CLOCKSOURCE 0 #define KVM_FEATURE_NOP_IO_DELAY 1 #define KVM_FEATURE_MMU_OP 2 #define MSR_KVM_WALL_CLOCK 0x11 #define MSR_KVM_SYSTEM_TIME 0x12 #define KVM_MAX_MMU_OP_BATCH 32 /* Operations for KVM_HC_MMU_OP */ #define KVM_MMU_OP_WRITE_PTE 1 #define KVM_MMU_OP_FLUSH_TLB 2 #define KVM_MMU_OP_RELEASE_PT 3 /* Payload for KVM_HC_MMU_OP */ struct kvm_mmu_op_header { __u32 op; __u32 pad; }; struct kvm_mmu_op_write_pte { struct kvm_mmu_op_header header; __u64 pte_phys; __u64 pte_val; }; struct kvm_mmu_op_flush_tlb { struct kvm_mmu_op_header header; }; struct kvm_mmu_op_release_pt { struct kvm_mmu_op_header header; __u64 pt_phys; }; #ifdef __KERNEL__ #include <asm/processor.h> extern void kvmclock_init(void); /* This instruction is vmcall. On non-VT architectures, it will generate a * trap that we will then rewrite to the appropriate instruction. */ #define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1" /* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun * instruction. The hypervisor may replace it with something else but only the * instructions are guaranteed to be supported. * * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively. * The hypercall number should be placed in rax and the return value will be * placed in rax. No other registers will be clobbered unless explicited * noted by the particular hypercall. */ static inline long kvm_hypercall0(unsigned int nr) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr) : "memory"); return ret; } static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1) : "memory"); return ret; } static inline long kvm_hypercall2(unsigned int nr, unsigned long p1, unsigned long p2) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1), "c"(p2) : "memory"); return ret; } static inline long kvm_hypercall3(unsigned int nr, unsigned long p1, unsigned long p2, unsigned long p3) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1), "c"(p2), "d"(p3) : "memory"); return ret; } static inline long kvm_hypercall4(unsigned int nr, unsigned long p1, unsigned long p2, unsigned long p3, unsigned long p4) { long ret; asm volatile(KVM_HYPERCALL : "=a"(ret) : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4) : "memory"); return ret; } static inline int kvm_para_available(void) { unsigned int eax, ebx, ecx, edx; char signature[13]; cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx); memcpy(signature + 0, &ebx, 4); memcpy(signature + 4, &ecx, 4); memcpy(signature + 8, &edx, 4); signature[12] = 0; if (strcmp(signature, "KVMKVMKVM") == 0) return 1; return 0; } static inline unsigned int kvm_arch_para_features(void) { return cpuid_eax(KVM_CPUID_FEATURES); } #endif #endif