Ingo Molnar | 102d832 | 2007-02-19 14:37:47 +0200 | [diff] [blame^] | 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 | |
| 55 | #endif |