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-rw-r--r--include/asm-x86/kvm_para.h105
-rw-r--r--include/linux/kvm_para.h105
2 files changed, 117 insertions, 93 deletions
diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
new file mode 100644
index 000000000000..c6f3fd8d8c53
--- /dev/null
+++ b/include/asm-x86/kvm_para.h
@@ -0,0 +1,105 @@
1#ifndef __X86_KVM_PARA_H
2#define __X86_KVM_PARA_H
3
4/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
5 * should be used to determine that a VM is running under KVM.
6 */
7#define KVM_CPUID_SIGNATURE 0x40000000
8
9/* This CPUID returns a feature bitmap in eax. Before enabling a particular
10 * paravirtualization, the appropriate feature bit should be checked.
11 */
12#define KVM_CPUID_FEATURES 0x40000001
13
14#ifdef __KERNEL__
15#include <asm/processor.h>
16
17/* This instruction is vmcall. On non-VT architectures, it will generate a
18 * trap that we will then rewrite to the appropriate instruction.
19 */
20#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
21
22/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
23 * instruction. The hypervisor may replace it with something else but only the
24 * instructions are guaranteed to be supported.
25 *
26 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
27 * The hypercall number should be placed in rax and the return value will be
28 * placed in rax. No other registers will be clobbered unless explicited
29 * noted by the particular hypercall.
30 */
31
32static inline long kvm_hypercall0(unsigned int nr)
33{
34 long ret;
35 asm volatile(KVM_HYPERCALL
36 : "=a"(ret)
37 : "a"(nr));
38 return ret;
39}
40
41static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
42{
43 long ret;
44 asm volatile(KVM_HYPERCALL
45 : "=a"(ret)
46 : "a"(nr), "b"(p1));
47 return ret;
48}
49
50static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
51 unsigned long p2)
52{
53 long ret;
54 asm volatile(KVM_HYPERCALL
55 : "=a"(ret)
56 : "a"(nr), "b"(p1), "c"(p2));
57 return ret;
58}
59
60static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
61 unsigned long p2, unsigned long p3)
62{
63 long ret;
64 asm volatile(KVM_HYPERCALL
65 : "=a"(ret)
66 : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
67 return ret;
68}
69
70static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
71 unsigned long p2, unsigned long p3,
72 unsigned long p4)
73{
74 long ret;
75 asm volatile(KVM_HYPERCALL
76 : "=a"(ret)
77 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
78 return ret;
79}
80
81static inline int kvm_para_available(void)
82{
83 unsigned int eax, ebx, ecx, edx;
84 char signature[13];
85
86 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
87 memcpy(signature + 0, &ebx, 4);
88 memcpy(signature + 4, &ecx, 4);
89 memcpy(signature + 8, &edx, 4);
90 signature[12] = 0;
91
92 if (strcmp(signature, "KVMKVMKVM") == 0)
93 return 1;
94
95 return 0;
96}
97
98static inline unsigned int kvm_arch_para_features(void)
99{
100 return cpuid_eax(KVM_CPUID_FEATURES);
101}
102
103#endif
104
105#endif
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index cc5dfb433706..e4db25ffdb52 100644
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -1,110 +1,29 @@
1#ifndef __LINUX_KVM_PARA_H 1#ifndef __LINUX_KVM_PARA_H
2#define __LINUX_KVM_PARA_H 2#define __LINUX_KVM_PARA_H
3 3
4/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It 4/*
5 * should be used to determine that a VM is running under KVM. 5 * This header file provides a method for making a hypercall to the host
6 * Architectures should define:
7 * - kvm_hypercall0, kvm_hypercall1...
8 * - kvm_arch_para_features
9 * - kvm_para_available
6 */ 10 */
7#define KVM_CPUID_SIGNATURE 0x40000000
8
9/* This CPUID returns a feature bitmap in eax. Before enabling a particular
10 * paravirtualization, the appropriate feature bit should be checked.
11 */
12#define KVM_CPUID_FEATURES 0x40000001
13 11
14/* Return values for hypercalls */ 12/* Return values for hypercalls */
15#define KVM_ENOSYS 1000 13#define KVM_ENOSYS 1000
16 14
17#ifdef __KERNEL__ 15#ifdef __KERNEL__
18#include <asm/processor.h> 16/*
19 17 * hypercalls use architecture specific
20/* This instruction is vmcall. On non-VT architectures, it will generate a
21 * trap that we will then rewrite to the appropriate instruction.
22 */
23#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
24
25/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
26 * instruction. The hypervisor may replace it with something else but only the
27 * instructions are guaranteed to be supported.
28 *
29 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
30 * The hypercall number should be placed in rax and the return value will be
31 * placed in rax. No other registers will be clobbered unless explicited
32 * noted by the particular hypercall.
33 */ 18 */
34 19#include <asm/kvm_para.h>
35static inline long kvm_hypercall0(unsigned int nr)
36{
37 long ret;
38 asm volatile(KVM_HYPERCALL
39 : "=a"(ret)
40 : "a"(nr));
41 return ret;
42}
43
44static 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 return ret;
51}
52
53static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
54 unsigned long p2)
55{
56 long ret;
57 asm volatile(KVM_HYPERCALL
58 : "=a"(ret)
59 : "a"(nr), "b"(p1), "c"(p2));
60 return ret;
61}
62
63static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
64 unsigned long p2, unsigned long p3)
65{
66 long ret;
67 asm volatile(KVM_HYPERCALL
68 : "=a"(ret)
69 : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
70 return ret;
71}
72
73static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
74 unsigned long p2, unsigned long p3,
75 unsigned long p4)
76{
77 long ret;
78 asm volatile(KVM_HYPERCALL
79 : "=a"(ret)
80 : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
81 return ret;
82}
83
84static inline int kvm_para_available(void)
85{
86 unsigned int eax, ebx, ecx, edx;
87 char signature[13];
88
89 cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
90 memcpy(signature + 0, &ebx, 4);
91 memcpy(signature + 4, &ecx, 4);
92 memcpy(signature + 8, &edx, 4);
93 signature[12] = 0;
94
95 if (strcmp(signature, "KVMKVMKVM") == 0)
96 return 1;
97
98 return 0;
99}
100 20
101static inline int kvm_para_has_feature(unsigned int feature) 21static inline int kvm_para_has_feature(unsigned int feature)
102{ 22{
103 if (cpuid_eax(KVM_CPUID_FEATURES) & (1UL << feature)) 23 if (kvm_arch_para_features() & (1UL << feature))
104 return 1; 24 return 1;
105 return 0; 25 return 0;
106} 26}
27#endif /* __KERNEL__ */
28#endif /* __LINUX_KVM_PARA_H */
107 29
108#endif
109
110#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-22 12:28:45 -0500