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102d8325a1
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>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
#ifndef __LINUX_KVM_PARA_H
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#define __LINUX_KVM_PARA_H
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/*
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* Guest OS interface for KVM paravirtualization
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*
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* Note: this interface is totally experimental, and is certain to change
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* as we make progress.
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*/
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/*
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* Per-VCPU descriptor area shared between guest and host. Writable to
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* both guest and host. Registered with the host by the guest when
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* a guest acknowledges paravirtual mode.
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*
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* NOTE: all addresses are guest-physical addresses (gpa), to make it
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* easier for the hypervisor to map between the various addresses.
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*/
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struct kvm_vcpu_para_state {
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/*
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* API version information for compatibility. If there's any support
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* mismatch (too old host trying to execute too new guest) then
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* the host will deny entry into paravirtual mode. Any other
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* combination (new host + old guest and new host + new guest)
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* is supposed to work - new host versions will support all old
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* guest API versions.
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*/
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u32 guest_version;
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u32 host_version;
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u32 size;
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u32 ret;
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/*
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* The address of the vm exit instruction (VMCALL or VMMCALL),
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* which the host will patch according to the CPU model the
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* VM runs on:
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*/
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u64 hypercall_gpa;
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} __attribute__ ((aligned(PAGE_SIZE)));
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#define KVM_PARA_API_VERSION 1
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/*
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* This is used for an RDMSR's ECX parameter to probe for a KVM host.
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* Hopefully no CPU vendor will use up this number. This is placed well
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* out of way of the typical space occupied by CPU vendors' MSR indices,
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* and we think (or at least hope) it wont be occupied in the future
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* either.
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*/
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#define MSR_KVM_API_MAGIC 0x87655678
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#define KVM_EINVAL 1
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#endif
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