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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

/*

 * Hypercall calling convention:

 *

 * Each hypercall may have 0-6 parameters.

 *

 * 64-bit hypercall index is in RAX, goes from 0 to __NR_hypercalls-1

 *

 * 64-bit parameters 1-6 are in the standard gcc x86_64 calling convention

 * order: RDI, RSI, RDX, RCX, R8, R9.

 *

 * 32-bit index is EBX, parameters are: EAX, ECX, EDX, ESI, EDI, EBP.

 * (the first 3 are according to the gcc regparm calling convention)

 *

 * No registers are clobbered by the hypercall, except that the

 * return value is in RAX.

 */

#define __NR_hypercalls                 0

#endif