diff options
author | Ingo Molnar <mingo@elte.hu> | 2007-02-19 14:37:47 +0200 |
---|---|---|
committer | Avi Kivity <avi@qumranet.com> | 2007-03-04 11:12:40 +0200 |
commit | 102d8325a1d2f266d3d0a03fdde948544e72c12d (patch) | |
tree | 21024c8b9b2b702c79200343e26f14f075da0479 /include | |
parent | 5972e9535e94bf875eb8eab8a667ba04c7583874 (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.h | 55 |
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 000000000000..74be5c1002ec --- /dev/null +++ b/include/linux/kvm_para.h @@ -0,0 +1,55 @@ +#ifndef __LINUX_KVM_PARA_H +#define __LINUX_KVM_PARA_H + +/* + * Guest OS interface for KVM paravirtualization + * + * Note: this interface is totally experimental, and is certain to change + * as we make progress. + */ + +/* + * Per-VCPU descriptor area shared between guest and host. Writable to + * both guest and host. Registered with the host by the guest when + * a guest acknowledges paravirtual mode. + * + * NOTE: all addresses are guest-physical addresses (gpa), to make it + * easier for the hypervisor to map between the various addresses. + */ +struct kvm_vcpu_para_state { + /* + * API version information for compatibility. If there's any support + * mismatch (too old host trying to execute too new guest) then + * the host will deny entry into paravirtual mode. Any other + * combination (new host + old guest and new host + new guest) + * is supposed to work - new host versions will support all old + * guest API versions. + */ + u32 guest_version; + u32 host_version; + u32 size; + u32 ret; + + /* + * The address of the vm exit instruction (VMCALL or VMMCALL), + * which the host will patch according to the CPU model the + * VM runs on: + */ + u64 hypercall_gpa; + +} __attribute__ ((aligned(PAGE_SIZE))); + +#define KVM_PARA_API_VERSION 1 + +/* + * This is used for an RDMSR's ECX parameter to probe for a KVM host. + * Hopefully no CPU vendor will use up this number. This is placed well + * out of way of the typical space occupied by CPU vendors' MSR indices, + * and we think (or at least hope) it wont be occupied in the future + * either. + */ +#define MSR_KVM_API_MAGIC 0x87655678 + +#define KVM_EINVAL 1 + +#endif |