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authorIngo Molnar <mingo@elte.hu>2007-02-19 07:37:47 -0500
committerAvi Kivity <avi@qumranet.com>2007-03-04 04:12:40 -0500
commit102d8325a1d2f266d3d0a03fdde948544e72c12d (patch)
tree21024c8b9b2b702c79200343e26f14f075da0479 /include
parent5972e9535e94bf875eb8eab8a667ba04c7583874 (diff)
KVM: add MSR based hypercall API
This adds a special MSR based hypercall API to KVM. This is to be used by paravirtual kernels and virtual drivers. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kvm_para.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
new file mode 100644
index 00000000000..74be5c1002e
--- /dev/null
+++ b/include/linux/kvm_para.h
@@ -0,0 +1,55 @@
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 */
19struct 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