73 lines
2.1 KiB
C
73 lines
2.1 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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/*
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* Hypercall calling convention:
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*
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* Each hypercall may have 0-6 parameters.
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*
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* 64-bit hypercall index is in RAX, goes from 0 to __NR_hypercalls-1
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*
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* 64-bit parameters 1-6 are in the standard gcc x86_64 calling convention
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* order: RDI, RSI, RDX, RCX, R8, R9.
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*
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* 32-bit index is EBX, parameters are: EAX, ECX, EDX, ESI, EDI, EBP.
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* (the first 3 are according to the gcc regparm calling convention)
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*
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* No registers are clobbered by the hypercall, except that the
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* return value is in RAX.
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*/
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#define __NR_hypercalls 0
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#endif
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