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KVM: Per-architecture hypercall definitions
Currently kvm provides hypercalls only for x86* architectures. To provide hypercall infrastructure for other kvm architectures I split kvm_para.h into a generic header file and architecture specific definitions. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
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Christian Borntraeger
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Avi Kivity
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Jan 30, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| #ifndef __X86_KVM_PARA_H | ||
| #define __X86_KVM_PARA_H | ||
|
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| /* 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 | ||
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| /* 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 | ||
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| #ifdef __KERNEL__ | ||
| #include <asm/processor.h> | ||
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| /* 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" | ||
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| /* 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. | ||
| */ | ||
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||
| static inline long kvm_hypercall0(unsigned int nr) | ||
| { | ||
| long ret; | ||
| asm volatile(KVM_HYPERCALL | ||
| : "=a"(ret) | ||
| : "a"(nr)); | ||
| return ret; | ||
| } | ||
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| static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) | ||
| { | ||
| long ret; | ||
| asm volatile(KVM_HYPERCALL | ||
| : "=a"(ret) | ||
| : "a"(nr), "b"(p1)); | ||
| return ret; | ||
| } | ||
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| 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)); | ||
| return ret; | ||
| } | ||
|
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| 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)); | ||
| return ret; | ||
| } | ||
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| 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)); | ||
| return ret; | ||
| } | ||
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| static inline int kvm_para_available(void) | ||
| { | ||
| unsigned int eax, ebx, ecx, edx; | ||
| char signature[13]; | ||
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| 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; | ||
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| if (strcmp(signature, "KVMKVMKVM") == 0) | ||
| return 1; | ||
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| return 0; | ||
| } | ||
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| static inline unsigned int kvm_arch_para_features(void) | ||
| { | ||
| return cpuid_eax(KVM_CPUID_FEATURES); | ||
| } | ||
|
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||
| #endif | ||
|
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||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,110 +1,29 @@ | ||
| #ifndef __LINUX_KVM_PARA_H | ||
| #define __LINUX_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. | ||
| /* | ||
| * This header file provides a method for making a hypercall to the host | ||
| * Architectures should define: | ||
| * - kvm_hypercall0, kvm_hypercall1... | ||
| * - kvm_arch_para_features | ||
| * - kvm_para_available | ||
| */ | ||
| #define KVM_CPUID_SIGNATURE 0x40000000 | ||
|
|
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| /* 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 | ||
|
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| /* Return values for hypercalls */ | ||
| #define KVM_ENOSYS 1000 | ||
|
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| #ifdef __KERNEL__ | ||
| #include <asm/processor.h> | ||
|
|
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| /* 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. | ||
| /* | ||
| * hypercalls use architecture specific | ||
| */ | ||
|
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||
| static inline long kvm_hypercall0(unsigned int nr) | ||
| { | ||
| long ret; | ||
| asm volatile(KVM_HYPERCALL | ||
| : "=a"(ret) | ||
| : "a"(nr)); | ||
| return ret; | ||
| } | ||
|
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| static inline long kvm_hypercall1(unsigned int nr, unsigned long p1) | ||
| { | ||
| long ret; | ||
| asm volatile(KVM_HYPERCALL | ||
| : "=a"(ret) | ||
| : "a"(nr), "b"(p1)); | ||
| return ret; | ||
| } | ||
|
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| 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)); | ||
| return ret; | ||
| } | ||
|
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| 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)); | ||
| return ret; | ||
| } | ||
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| 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)); | ||
| return ret; | ||
| } | ||
|
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| static inline int kvm_para_available(void) | ||
| { | ||
| unsigned int eax, ebx, ecx, edx; | ||
| char signature[13]; | ||
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| 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; | ||
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| if (strcmp(signature, "KVMKVMKVM") == 0) | ||
| return 1; | ||
|
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| return 0; | ||
| } | ||
| #include <asm/kvm_para.h> | ||
|
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| static inline int kvm_para_has_feature(unsigned int feature) | ||
| { | ||
| if (cpuid_eax(KVM_CPUID_FEATURES) & (1UL << feature)) | ||
| if (kvm_arch_para_features() & (1UL << feature)) | ||
| return 1; | ||
| return 0; | ||
| } | ||
| #endif /* __KERNEL__ */ | ||
| #endif /* __LINUX_KVM_PARA_H */ | ||
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| #endif | ||
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| #endif |