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102d8325 IM |
1 | #ifndef __LINUX_KVM_PARA_H |
2 | #define __LINUX_KVM_PARA_H | |
3 | ||
4 | /* | |
5 | * Guest OS interface for KVM paravirtualization | |
6 | * | |
7 | * Note: this interface is totally experimental, and is certain to change | |
8 | * as we make progress. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * Per-VCPU descriptor area shared between guest and host. Writable to | |
13 | * both guest and host. Registered with the host by the guest when | |
14 | * a guest acknowledges paravirtual mode. | |
15 | * | |
16 | * NOTE: all addresses are guest-physical addresses (gpa), to make it | |
17 | * easier for the hypervisor to map between the various addresses. | |
18 | */ | |
19 | struct kvm_vcpu_para_state { | |
20 | /* | |
21 | * API version information for compatibility. If there's any support | |
22 | * mismatch (too old host trying to execute too new guest) then | |
23 | * the host will deny entry into paravirtual mode. Any other | |
24 | * combination (new host + old guest and new host + new guest) | |
25 | * is supposed to work - new host versions will support all old | |
26 | * guest API versions. | |
27 | */ | |
28 | u32 guest_version; | |
29 | u32 host_version; | |
30 | u32 size; | |
31 | u32 ret; | |
32 | ||
33 | /* | |
34 | * The address of the vm exit instruction (VMCALL or VMMCALL), | |
35 | * which the host will patch according to the CPU model the | |
36 | * VM runs on: | |
37 | */ | |
38 | u64 hypercall_gpa; | |
39 | ||
40 | } __attribute__ ((aligned(PAGE_SIZE))); | |
41 | ||
42 | #define KVM_PARA_API_VERSION 1 | |
43 | ||
44 | /* | |
45 | * This is used for an RDMSR's ECX parameter to probe for a KVM host. | |
46 | * Hopefully no CPU vendor will use up this number. This is placed well | |
47 | * out of way of the typical space occupied by CPU vendors' MSR indices, | |
48 | * and we think (or at least hope) it wont be occupied in the future | |
49 | * either. | |
50 | */ | |
51 | #define MSR_KVM_API_MAGIC 0x87655678 | |
52 | ||
53 | #define KVM_EINVAL 1 | |
54 | ||
c21415e8 IM |
55 | /* |
56 | * Hypercall calling convention: | |
57 | * | |
58 | * Each hypercall may have 0-6 parameters. | |
59 | * | |
60 | * 64-bit hypercall index is in RAX, goes from 0 to __NR_hypercalls-1 | |
61 | * | |
62 | * 64-bit parameters 1-6 are in the standard gcc x86_64 calling convention | |
63 | * order: RDI, RSI, RDX, RCX, R8, R9. | |
64 | * | |
65 | * 32-bit index is EBX, parameters are: EAX, ECX, EDX, ESI, EDI, EBP. | |
66 | * (the first 3 are according to the gcc regparm calling convention) | |
67 | * | |
68 | * No registers are clobbered by the hypercall, except that the | |
69 | * return value is in RAX. | |
70 | */ | |
71 | #define __NR_hypercalls 0 | |
72 | ||
102d8325 | 73 | #endif |