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/*
 * hvm.h: Hardware virtual machine assist interface definitions.
 *
 * Leendert van Doorn, leendert@watson.ibm.com
 * Copyright (c) 2005, International Business Machines Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 */

#ifndef __ASM_X86_HVM_HVM_H__
#define __ASM_X86_HVM_HVM_H__

#include <asm/current.h>
#include <asm/x86_emulate.h>
#include <asm/hvm/asid.h>
#include <public/domctl.h>
#include <public/hvm/save.h>

/* Interrupt acknowledgement sources. */
enum hvm_intsrc {
    hvm_intsrc_none,
    hvm_intsrc_pic,
    hvm_intsrc_lapic,
    hvm_intsrc_nmi,
    hvm_intsrc_mce,
    hvm_intsrc_vector
};
struct hvm_intack {
    uint8_t source; /* enum hvm_intsrc */
    uint8_t vector;
};
#define hvm_intack(src, vec)   ((struct hvm_intack) { hvm_intsrc_##src, vec })
#define hvm_intack_none        hvm_intack(none, 0)
#define hvm_intack_pic(vec)    hvm_intack(pic, vec)
#define hvm_intack_lapic(vec)  hvm_intack(lapic, vec)
#define hvm_intack_nmi         hvm_intack(nmi, 2)
#define hvm_intack_mce         hvm_intack(mce, 18)
#define hvm_intack_vector(vec) hvm_intack(vector, vec)
enum hvm_intblk {
    hvm_intblk_none,      /* not blocked (deliverable) */
    hvm_intblk_shadow,    /* MOV-SS or STI shadow */
    hvm_intblk_rflags_ie, /* RFLAGS.IE == 0 */
    hvm_intblk_tpr,       /* LAPIC TPR too high */
    hvm_intblk_nmi_iret   /* NMI blocked until IRET */
};

/* These happen to be the same as the VMX interrupt shadow definitions. */
#define HVM_INTR_SHADOW_STI    0x00000001
#define HVM_INTR_SHADOW_MOV_SS 0x00000002
#define HVM_INTR_SHADOW_SMI    0x00000004
#define HVM_INTR_SHADOW_NMI    0x00000008

/*
 * HAP super page capabilities:
 * bit0: if 2MB super page is allowed?
 * bit1: if 1GB super page is allowed?
 */
#define HVM_HAP_SUPERPAGE_2MB   0x00000001
#define HVM_HAP_SUPERPAGE_1GB   0x00000002

/*
 * The hardware virtual machine (HVM) interface abstracts away from the
 * x86/x86_64 CPU virtualization assist specifics. Currently this interface
 * supports Intel's VT-x and AMD's SVM extensions.
 */
struct hvm_function_table {
    char *name;

    /* Support Hardware-Assisted Paging? */
    int hap_supported;

    /* Indicate HAP capabilities. */
    int hap_capabilities;


    /*
     * Initialise/destroy HVM domain/vcpu resources
     */
    int  (*domain_initialise)(struct domain *d);
    void (*domain_destroy)(struct domain *d);
    int  (*vcpu_initialise)(struct vcpu *v);
    void (*vcpu_destroy)(struct vcpu *v);

    /* save and load hvm guest cpu context for save/restore */
    void (*save_cpu_ctxt)(struct vcpu *v, struct hvm_hw_cpu *ctxt);
    int (*load_cpu_ctxt)(struct vcpu *v, struct hvm_hw_cpu *ctxt);

    /* Examine specifics of the guest state. */
    unsigned int (*get_interrupt_shadow)(struct vcpu *v);
    void (*set_interrupt_shadow)(struct vcpu *v, unsigned int intr_shadow);
    int (*guest_x86_mode)(struct vcpu *v);
    void (*get_segment_register)(struct vcpu *v, enum x86_segment seg,
                                 struct segment_register *reg);
    void (*set_segment_register)(struct vcpu *v, enum x86_segment seg,
                                 struct segment_register *reg);

    /* 
     * Re-set the value of CR3 that Xen runs on when handling VM exits.
     */
    void (*update_host_cr3)(struct vcpu *v);

    /*
     * Called to inform HVM layer that a guest CRn or EFER has changed.
     */
    void (*update_guest_cr)(struct vcpu *v, unsigned int cr);
    void (*update_guest_efer)(struct vcpu *v);