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#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
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